The measurements you will use constantly

Three functions do most of the work on a PCB bench. Voltage measurement confirms your power rails: the input supply, any regulated rails, and the voltage at the pins that matter. Resistance measurement, with the board unpowered, gives a first read on shorts and on resistor values in isolation. Continuity — the beeping mode — is the everyday hero: it answers, in a second per probe pair, whether two points are connected, which is exactly the question a Gerber layer raises. Is this via really joining top and bottom copper? Does this ground pad reach the ground plane? The design intent lives in files like those you check in our Gerber viewer hub; continuity is how you verify the manufactured board honoured it.

Continuity done well

Not all continuity modes are equal. A good one responds almost instantly, so you can sweep probes across a connector or along a row of pins and hear breaks as they happen, rather than pausing at every point. Latched, laggy beepers make that sweep unreliable and quietly teach you to distrust the tool. If you can, test continuity response in person or look for reviews that specifically time it. Also learn your meter’s threshold behaviour at a general level: continuity mode indicates low resistance, not a perfect zero-ohm connection, so a beep over a long, thin trace is expected — interpret it alongside a resistance reading when the answer really matters.

Auto-ranging versus manual ranging

A manual-ranging meter asks you to pick the measurement range; an auto-ranging meter picks it for you and adjusts as readings change. For electronics troubleshooting, where you move quickly between points at unknown voltages, auto-ranging removes a whole class of fumbling and misreading, and it is the sensible default for most makers. Manual ranging still has fans for its speed once you know the expected value, and many auto-ranging meters let you lock a range manually when you want to. What matters most is a display that settles quickly and a resolution — the smallest change the meter can show — suited to the low voltages and small resistances of board-level work.

Capacitance, diode mode and the extras

Beyond the core three, a few extra functions earn their keep. Diode mode lets you check junctions and, with care, the orientation and health of diodes and LEDs — a quick way to sanity-check parts the silkscreen says should face a certain way. Capacitance measurement, on the meters that offer it, gives a rough check of capacitors out of circuit; treat in-circuit readings with scepticism, because the rest of the board participates in the measurement. Frequency or duty-cycle readouts help on some digital boards, and temperature probes occasionally solve non-electronic problems around the bench. None of these extras should outrank the basics: a meter with excellent continuity, honest voltage accuracy and a clear display beats a feature-stuffed meter that does the basics poorly.

CAT ratings: the safety shorthand to understand

Meters and their test leads carry safety categories, labelled CAT, which describe the kind of electrical environment the equipment is designed to be used in safely — roughly, how much transient energy it is built to withstand. The higher categories correspond to harsher locations, closer to building power distribution; lower categories correspond to protected, low-energy electronics circuits. For board-level electronics work you will normally be measuring low-voltage circuits, but the discipline still matters: use a meter and leads whose rating suits the highest-energy thing you might ever probe with them, never use a damaged lead, and keep bench meters for electronics away from mains wiring unless the equipment is explicitly rated and you are qualified for that work. A CAT marking from a recognisable test regime is a safety claim — be sceptical of meters that print impressive categories with no traceable certification behind them.

Leads, probes and the physical meter

The meter you hold is only half the instrument; the leads finish it. Flexible, intact leads with probes that suit board work — fine enough to land on a single test point without bridging its neighbour — make measurements you can trust. Consider probe accessories for dense boards, and inspect leads regularly: intermittent leads create phantom faults that waste hours. The meter itself should have a readable display in your bench lighting, a case that survives being knocked off a crowded desk, sensible battery life, and an auto-off that does not strand you mid-measurement. A backlight and a kickstand sound trivial until your first evening debugging session under a board.

Where to look

When you are ready to compare options, you can browse multimeters for electronics on Amazon. That is an affiliate link, as described on our Affiliate Disclosure page — purchases through gear links on this site may earn us a commission at no extra cost to you. Judge candidates by fast, trustworthy continuity, auto-ranging, a legible display and credible safety ratings for how you will actually use the meter, rather than by the longest feature list.

Putting the meter to work on your boards

A good first routine for any newly assembled board, before power is ever applied: continuity-check each power rail against ground to catch gross shorts, verify a handful of critical connections the Gerber layers promised — the same connections you can trace visually in Gerbv with the method in measuring distances in Gerbv — then apply power and confirm rail voltages at the points the design specifies. That five-minute habit, viewer first and meter second, prevents the most expensive sentence in hobby electronics: it was working until I powered it up. For the full pre-flight routine, see the pre-order Gerber checklist and carry its habits through to assembly.

Frequently asked questions

What is the most important multimeter feature for PCB work?

Fast, reliable continuity, closely followed by DC voltage measurement. Continuity verifies that the manufactured board connects what the Gerber files say it should; voltage confirms power rails once the board is assembled and ready for a first power-up.

Should I choose an auto-ranging or manual-ranging meter?

Auto-ranging is the better default for most electronics troubleshooting because it removes range-guessing as you move between unknown points, and most auto-ranging meters still let you lock a range manually when you know the expected value.

What does a CAT rating on a multimeter mean?

It is a safety category describing the electrical environment the meter and leads are designed for, with higher categories built for higher-energy locations closer to power distribution. Match the rating to the most energetic circuit you might measure, and be sceptical of impressive ratings with no traceable certification.

Stereo microscopes: depth you can work under

A stereo (optical) microscope gives each eye its own view, so you see genuine depth. That depth perception is why many assemblers prefer stereo optics for soldering and rework under magnification: your iron, tweezers and the board all sit in a three-dimensional space your hands can navigate naturally. Stereo scopes are typically used at relatively modest magnifications, which is a feature, not a limitation — inspection and assembly need context as much as enlargement. The trade-offs are size, cost of quality optics, and the fact that what you see stays at the eyepieces: capturing an image to share or document usually needs an additional camera.

Digital and USB microscopes: the screen-first option

A digital microscope puts a camera and a screen — its own, or your computer’s via USB — between you and the board. The advantages are practical: several people can see the same view, you can capture stills and video for bug reports, supplier photos and build logs, and your posture can be better because you look at a screen rather than bending over eyepieces. The compromises are equally real: a flat image with no true depth, some display lag on many models, and depth of field that can make a tilted board frustrating — part of it sharp, part of it not. For pure inspection and documentation, digital is often the pragmatic choice; for long sessions of working under magnification, many people still prefer stereo.

Magnification: less, clearly, beats more, vaguely

Manufacturers compete on maximum magnification numbers, but PCB inspection lives at the lower end: you need enough enlargement to judge a joint or read a marking, while keeping enough of the board in view to stay oriented. Very high magnification narrows the field, exaggerates every vibration and reduces depth of field, so the image is harder — not easier — to use. Judge a microscope by the clarity and working distance at the magnifications you will actually use, not by the largest number on the box. If a specification looks extraordinary for the price, treat it as a marketing figure and look for hands-on reviews of the same class of device instead.

Working distance and stands

Working distance — the space between the lens and the board — decides whether tools fit under the microscope at all. Inspection-only devices can tolerate a short distance; anything you intend to solder under needs room for the iron and your hands. The stand matters just as much. A heavy, rigid stand or boom arm holds the view steady, lets you swing the microscope over a large board, and keeps the focus where you set it. A wobbly stand turns every table nudge into a refocusing exercise. If you work on larger boards, a boom stand that lets the board stay flat while the optics move is worth prioritising over extra magnification.

Lighting makes the image

More inspection problems are lighting problems than lens problems. Bare copper, solder mask and shiny joints reflect light in wildly different ways, and a joint that hides under one angle reveals its shape under another. Look for adjustable, even illumination — a ring light is the common pattern — and, if you can, the ability to angle light rather than only fire it straight down. Oblique light throws tiny bridges and lifted leads into shadowed relief. Before blaming a microscope for a poor view, experiment with light angle and intensity; the same scope can look mediocre or excellent depending on how the board is lit.

Checking the physical board against the Gerber data

The microscope and the viewer are strongest together. In Gerbv you can isolate the silkscreen and paste layers, note exactly what should be printed and where paste should land, then compare the delivered board feature by feature — a workflow anchored in our guide to loading and aligning Gerber layers. After assembly, compare component placement against the board you approved: a rotated part or a missing component is obvious under magnification if you know what the design intended. Keep the design view open on a second screen while you inspect; inspection without a reference is just looking.

Where to look

To compare current models against these criteria, you can browse digital microscopes for PCB inspection on Amazon. That is an affiliate link, covered by our Affiliate Disclosure: a purchase through it may earn this site a commission at no extra cost to you. Whether you shop there or elsewhere, weigh working distance, stand rigidity and lighting ahead of headline magnification, and be wary of any listing that promises laboratory performance at a novelty price.

A practical shortlist method

Write down your two real jobs — for most makers, inspecting incoming bare boards and checking solder joints after assembly — and score every candidate against just those jobs. Add screen capture only if you genuinely document builds or dispute board quality with a supplier. That discipline keeps you from buying a documentation rig when you needed a working scope, or the reverse. And remember the cheapest inspection upgrade costs nothing: good light, a clean board, and the patience to compare what arrived against the Gerber files you already checked in the Gerber viewer.

Frequently asked questions

Is a stereo or a digital microscope better for PCB work?

Stereo optics give true depth and suit working under magnification — soldering and rework. Digital microscopes suit inspection and documentation, with a shared screen view and easy image capture. Many benches eventually use digital for checking and stereo, or the naked eye with good light, for working.

How much magnification do I need to inspect solder joints?

PCB inspection is mostly low-magnification work: enough to judge joint shape, bridging and placement while keeping the surrounding board in view. Very high magnification narrows the field and depth of field and usually makes inspection harder, not easier.

What should I check on a bare PCB under a microscope?

Compare the physical board with the Gerber data you viewed: silkscreen clarity and position, paste-layer openings, drill positions, and any obvious etching or mask defects. Catching a discrepancy on the bare board is far cheaper than catching it after assembly.

Privacy: where do your design files go?

This is the deciding factor for most professional work. An online viewer can only show you your board by receiving your files: you upload the complete fabrication data for the design to a third-party server, where it is processed — and, depending on the service’s policies, possibly stored, logged or retained. For an open-source hobby board, that may be an acceptable trade. For a client’s design, an unreleased commercial product, or anything under a confidentiality obligation, uploading the manufacturing files is a disclosure — the Gerber set is, in effect, the recipe for the board. A desktop viewer never raises the question. Gerbv runs entirely on your machine; the files stay exactly where they started, and there is no account, no terms-of-service change and no server breach that can expose them. If the design is proprietary, this point alone settles the comparison.

File size and the whole set, not one file

A real board is not one file. It is a set — several copper, mask, silkscreen and paste layers, plus a drill file — that only makes sense inspected together, in registration. Web viewers impose upload limits and browser-side processing limits that vary by service and are rarely generous; large, dense boards with big copper pours can render slowly or fail outright in a browser tab, and uploading a multi-file set file-by-file is fiddly. A desktop application reads the set from your disk at full speed, stacks the layers, and lets you toggle, recolour and overlay them without re-uploading anything when you change your mind about one layer. The difference is minor for a tiny two-layer board and decisive for a complex one you will inspect repeatedly during a design review.

Offline work and independence

Desktop software works where the work is: on a factory floor, in a lab, on a train, during an internet outage, or inside a company network that blocks file-upload sites outright — many corporate networks do exactly that, for exactly the privacy reasons above. An online viewer is unavailable in all of those situations, and it is also unavailable on the day the service is down, changes its limits, or shuts down. Installing a desktop viewer is a one-time, few-minutes task; after that, the tool is simply there, behaving the same way every time, which is what you want from an inspection step in a manufacturing workflow.

Depth: measuring, reporting and exporting

Browser viewers are optimised for the quick look, and their feature sets reflect it — some offer no measurement tools at all, which rules out verifying a hole size, a clearance or a board dimension. A desktop viewer like Gerbv is built for inspection depth: measurement on the displayed image, layer controls with transparency so you can see through the stack, and report windows summarising the Gerber and drill codes actually used in your files. Export matters too: Gerbv exports the stacked view to PNG, PDF, PS, SVG and DXF, which is how a check becomes a record you can attach to a review or send to a colleague — without sending them the design files themselves. If your “viewing” regularly turns into “verifying”, that depth is the difference between the two categories.

Repeat use changes the maths

The honest case for online viewers is a single, occasional look: a file someone sent you, on a machine that is not yours, where installing software is not an option and the design is not sensitive. There, a browser viewer is genuinely the fastest path from file to picture, and tools such as the Ucamco reference viewer also offer an authoritative rendering for odd files. But notice how quickly the balance tips as use repeats. The second or third time you upload the same growing file set, wait for processing, and work within a browser’s limits, the one-time install you skipped would already have paid for itself. Professionals who check boards weekly — or daily — standardise on a desktop viewer for the same reason they standardise on any local tool: speed, privacy and predictability, every time.

There is also a consistency argument that rarely gets mentioned. A desktop viewer renders your file the same way today, next month and on a colleague’s machine running the same release, so when two people disagree about what a layer shows, they can compare like with like. A web service can change its renderer, its limits or its interface at any time, silently — fine for a glance, unhelpful when you are trying to reproduce exactly what you approved last week.

The balanced verdict

Online viewers are fine — for a quick, non-sensitive look, on someone else’s machine, at a small file. Desktop viewers win for everything else: proprietary designs that must not be uploaded, large or multi-file boards, offline and restricted-network work, measurement and export depth, and any workflow you repeat. That is why this site documents Gerbv, a free, open-source desktop viewer for Windows, Mac and Linux: it removes the privacy question, costs nothing, and is built for inspection rather than first impressions. Read the full overview on our Gerber viewer page, weigh the alternatives in best free Gerber viewers, or get Gerbv itself from the download page.

Frequently asked questions

Is it safe to upload Gerber files to an online viewer?

It depends on the design and the service. Uploading means a third party receives your complete fabrication data, so do not upload proprietary or client work. For a non-sensitive file and a quick look, a reputable online viewer is a reasonable convenience.

Do desktop Gerber viewers cost money?

Not necessarily. Gerbv is free and open source under GPL-2.0-or-later for Windows, Mac and Linux, and KiCad’s GerbView is free as part of that suite. Commercial desktop viewers exist too, usually with free tiers.

Can an online viewer measure my board?

Some can, some cannot — at least one well-known browser viewer offers no measurement tools at all. If verifying dimensions matters, a desktop viewer such as Gerbv, with measurement, reporting and export built in, is the safer default.

At a glance

How these viewers were compared

There are no star ratings in this roundup, deliberately. Viewers differ in kind, not just in quality, so each one is described by the facts that decide real use: which platforms it runs on, whether it is free software, a free tier of a paid product, or a free web service, whether it works offline or needs an upload, and the job it is actually built for — inspection and measurement, a quick render, an authoritative reference check, a 3D look, or conversion for CNC milling. Where a tool has a clear limit — no measurement tools, Windows-only, 2D only, a free-to-paid feature boundary — that limit is stated next to it rather than buried. If a tool you expected is missing, it is because this list sticks to established, genuinely free options rather than padding itself out with trialware that stops working. Prices and tiers change, so treat any free tier as “free at the level described, as of writing” and check the vendor’s current terms if that boundary matters to you.

Gerbv — the offline desktop viewer

Gerbv is a free, open-source viewer for Gerber RS-274X files, Excellon drill files and CSV pick-and-place files, originally from the gEDA project and now maintained on GitHub. The current release, v2.13.0 (March 20, 2026), ships native builds for Windows and macOS alongside Linux packages — the first release to do so. You stack layers, toggle colours and transparency, measure on the image, read report windows about the codes in use, and export to PNG, PDF, PS, SVG and DXF. Its limits are equally clear: 2D only, no design-rule or DFM checking, no RS-274D support, and only limited editing (object selection and deletion, format conversion, command-line panelisation). For the core job — privately checking fabrication files on your own machine, on any of the three desktop platforms, at no cost — it is the most complete fit on this list, and you can get it from the download page.

KiCad GerbView — if you already live in KiCad

GerbView is the viewer bundled inside the KiCad suite. If KiCad is your design tool, GerbView is already installed, shares your environment, and is the natural place for a first check of your own exports. The trade-off is weight: installing the full KiCad suite just to view a file someone sent you is a lot of software for a viewing job, which is where a small standalone viewer earns its place.

Tracespace View — the quick browser look

Tracespace View is a browser-based, open-source viewer that renders Gerber files as SVG in the browser. It is excellent for a fast visual sanity check — the board either looks right or it does not — and there is nothing to install. Its known limitation, worth stating plainly, is that it offers no measurement tools, so it cannot answer “is this hole the right size?” questions. And like any web viewer, consider what you are uploading before you drop a sensitive design into it.

Ucamco Reference Gerber Viewer — the format’s own reference

Ucamco maintains the Gerber specification, and its Reference Gerber Viewer is the format creator’s reference implementation. When a file renders differently in two viewers, or you suspect a file is technically unusual, checking it against the reference rendering is the closest thing to asking the specification itself. As an online tool it shares the usual upload considerations, so it suits occasional verification rather than everyday confidential work.

Mayhew Labs 3D Gerber Viewer — seeing the board in 3D

Most viewers on this list, Gerbv included, are strictly 2D. The Mayhew Labs 3D Gerber Viewer exists for the other question: what will this board actually look like? Its free browser-based 3D view is genuinely useful for spotting silkscreen mistakes, orientation problems and general look-and-feel issues before ordering. It complements a 2D measurement viewer rather than replacing one.

ViewMate — free tier of a commercial Windows tool

ViewMate, from Pentalogix, is a free Windows viewer that is also the entry point to a paid Pro product with editing and DFM capabilities. That model suits Windows users who want a free viewer today and a commercial upgrade path tomorrow. The flip side of any free tier is that the boundary between free and paid features is the vendor’s to draw and redraw, so check which capabilities your workflow needs before settling on it.

FlatCAM — a converter first, not a general viewer

FlatCAM is frequently listed as a Gerber viewer, but its real focus is different: it converts Gerber files into G-code for CNC isolation milling, for people who mill prototype boards themselves. If that is your process, FlatCAM is the relevant tool on this list. If you are ordering boards from a fab house and need to inspect, measure and export views, a dedicated viewer is the better match.

GerberLogix — Windows-only, with a Pro tier

GerberLogix is a Windows-only free viewer with a paid Pro tier. For a Windows-only user it is a reasonable desktop option that keeps files local like other desktop tools. Its platform limit rules it out for Mac and Linux users, and, as with ViewMate, the free-to-Pro boundary is worth checking against the features you actually use.

So which free Gerber viewer should you choose?

Choose by workflow. KiCad users already have GerbView. For a one-off look at a non-sensitive file, a browser viewer — Tracespace for a fast render, the Ucamco reference viewer for an authoritative one, Mayhew Labs when you want 3D — avoids any installation. CNC millers need FlatCAM. Windows users who want a commercial upgrade path can look at ViewMate or GerberLogix. And for repeat, private, cross-platform desktop work — stack the layers, measure, export, no uploads, no cost, no account — Gerbv is the recommendation this site stands behind. Start on the Gerber viewer page or go straight to the download page.

Start with the work, not the wattage headline

Think about the boards you actually build. Small through-hole kits, surface-mount prototypes and rework on boards someone else assembled all stress an iron differently. Fine surface-mount work rewards a light, well-balanced handpiece and small tips that get into dense areas without bridging neighbours. Through-hole and connector work rewards thermal recovery — the ability to bring a larger joint up to temperature and keep it there while solder flows, rather than camping on the pad and cooking it. If you mostly assemble your own designs, list the largest joints on those designs first: ground-plane connections, terminal blocks and shielding cans are the honest test, not the smallest resistor.

Temperature control is the core feature

The single most important difference between a basic iron and a station built for electronics work is closed-loop temperature control: you set a temperature, and the station works to hold the tip there as the joint draws heat away. That consistency protects pads and components, makes your results repeatable from joint to joint, and lets you lower the temperature for delicate work instead of compensating with technique alone. Look for a clear temperature display, controls you can adjust without hunting through menus mid-job, and a stand that holds the hot handpiece safely between joints. Stability matters more than chasing the highest number on a specification sheet.

Tips are a system, not an accessory

More soldering is done by the tip than by the station behind it. Before you buy, check the tip ecosystem: are several shapes and sizes readily available, are replacements easy to source, and can you swap tips without a long cool-down ritual? A small selection covering fine conical or chisel shapes for surface-mount work, a broader chisel for through-hole joints and a larger shape for ground-heavy connections will cover most hobby and small-batch assembly. Tips are consumables — they oxidise and wear — so a station whose tips are scarce or unusually expensive will frustrate you long after the initial purchase feels settled. Keep tips tinned, clean them on brass wool or a damp sponge as your maker advises, and retire tips that will no longer wet properly.

Station, standalone iron, or hot-air help?

A bench station separates the power and control unit from the handpiece, which usually means a lighter iron, a proper stand and a spare-parts path. That suits anyone who solders at the same desk regularly. A standalone mains iron or a portable USB-powered iron trades some of that comfort for simplicity and mobility — reasonable for occasional repairs, less satisfying for a full board assembly session. Hot air is a different tool for a different job: removing and reflowing surface-mount parts, especially multi-pin packages. Many makers add hot air later, once rework — not first assembly — becomes the bottleneck. Decide which job is yours today, and do not pay for the other job’s tool yet.

ESD safety and your boards

Modern components can be damaged by static discharges you never feel. For regular electronics work, prefer equipment described as ESD-safe, use a grounded mat and wrist strap where appropriate, and treat the soldering bench as part of the same careful chain that started with checking your Gerber files. ESD damage is a particularly cruel failure mode because the board may pass a quick power-on test and fail weeks later. The viewer cannot protect you from it; only handling discipline can. Keep unpopulated boards in their packaging until assembly, and handle populated boards by their edges.

Comfort, safety and the small details

You will hold this tool for hours across a build, so weight, grip heat and cable flexibility are real criteria, not luxuries. A cable that fights you drags the tip where you do not want it. Check also for a stable stand, a power switch you can reach, clear indication that the iron is hot, and sensible behaviour when the station is left idle. Ventilation deserves a line of its own: solder fume extraction or at least a small fan moving fumes away from your face makes long sessions far more tolerable, whatever station you choose.

Where to look

When you are ready to compare current options, you can browse soldering stations on Amazon. That is an affiliate link — if you buy through it, this site may earn a commission at no extra cost to you, as explained on our Affiliate Disclosure page. Gear links on this site are affiliate links; the criteria above are written to hold whether or not you use them. Compare on temperature control, tip availability and ESD handling first, and treat headline bundles of extra accessories with scepticism — a drawer of tips in shapes you never use is not value.

A sensible buying sequence

If you are equipping a bench around your own PCB projects, the order that tends to work is: a temperature-controlled station with a small set of well-chosen tips, basic fume handling, and only then hot air or a second iron when a real project demands it. Pair that with the inspection habit — check the bare board against your Gerber silkscreen and paste layers in Gerbv when it arrives, before a single joint is made, using our Gerber viewer hub as your starting point. Assembly mistakes caught on a bare board cost minutes; the same mistakes caught after soldering cost an evening of rework.

Frequently asked questions

Do I need a soldering station, or is a simple iron enough?

For occasional repairs a simple iron can be enough. For assembling your own PCBs regularly, a station with temperature control is the meaningful step up: more consistent joints, less pad damage, and a tip system you can build on over time.

What tip shapes should a beginner start with?

Start with a small selection rather than a large set: a fine shape for surface-mount pads, a medium chisel for general through-hole work, and a broader shape for larger, ground-connected joints. Replace and expand based on the joints you actually find difficult.

Why does ESD safety matter for a soldering station?

Static discharge can weaken or destroy sensitive components without any visible sign. ESD-safe equipment, used with sensible handling — a mat, careful handling by board edges, and keeping boards packaged until assembly — reduces a failure mode that no visual inspection can catch afterwards.

What a reference implementation is for

When two programs render the same Gerber file differently, someone has to be right. The reference viewer’s rendering is that arbitration: it shows the file as the specification’s maintainer intends it to be understood. That makes it the natural destination for a narrow, important class of problems — “this file looks wrong in my viewer; is the file odd, or is the viewer?” If the reference viewer shows the same oddity, the file is the story and you go back to the exporter. If it renders cleanly, you have learned something about your everyday tool, and you have a concrete, reproducible case to report. No ordinary viewer, Gerbv included, can claim that authority; a reference implementation does not need features to justify itself.

What the everyday tool is for

Daily inspection is a different sport: a full fabrication set, checked layer by layer, against a deadline. That is Gerbv’s design centre. It stacks Gerber RS-274X layers, Excellon drill files and CSV pick-and-place files together, so drills can be checked against pads and silkscreen against copper. It measures distances on the displayed image, opens report windows with statistics on the Gerber and drill codes used — including aperture usage — and exports the view to PNG, PDF, PS, SVG and DXF for documentation and fab correspondence. It runs on your machine, offline, with no upload and no account, which keeps client designs under your own confidentiality rules. Get it from the download page; the working routine is laid out on the Gerber viewer hub.

Online reference vs offline desktop in practice

The reference viewer lives online, in the browser: nothing to install, ideal for the occasional arbitration visit, and — like every online tool — somewhere your files travel to be rendered, which you should weigh for confidential work. Gerbv lives on your disk: available on a plane, in a restricted lab, or on the factory network that never touches the internet, and the same on every visit. There is also a consistency argument for daily work: checking revision twelve in the same tool, with the same habits and checklists as revisions one through eleven, catches differences that hopping between tools would mask.

Gerbv’s limits, for the record

Gerbv is a 2D viewer. It performs no DRC or DFM validation — its reports are statistics for your judgement, not verdicts — and it does not read legacy RS-274D files. And in the specific matter of spec interpretation, Gerbv is a participant, not the referee: its reading of RS-274X is its own implementation, which is precisely why the reference viewer exists as a court of appeal when an edge case matters.

A worked example of using both

Picture the situation the pairing exists for. A board comes back from a colleague and one layer renders in Gerbv with a shape you did not expect — a region that looks filled in your design intent appearing as an outline, say. Step one is local: check the layer stack, the file’s companions and your assumptions in Gerbv, where the full set is already loaded. If the oddity survives, step two is arbitration: load that single file in the reference viewer. Same shape there means the file genuinely says that, and the fix belongs in the export. A clean render there means the interpretation differs, and you have isolated a viewer edge case with evidence in hand. Ten minutes, two tools, no guessing — and the everyday nine cases out of ten never leave your desktop at all.

Verdict: workhorse and referee

Choose Gerbv for the everyday job — full sets, measurement, reports, export, offline and private. Choose the Ucamco Reference Gerber Viewer when the question is about the format itself: a rendering dispute, a strange construct in a file, a case where “what does the specification’s own viewer do with this?” is the deciding evidence. Keep both in the toolbox; they are answers to different questions that happen to share a file format.

Frequently asked questions

What is the Ucamco Reference Gerber Viewer?

It is the online reference implementation published by Ucamco, the maintainer of the Gerber specification. Its rendering shows how the format is intended to be interpreted, which makes it the authority to consult when viewers disagree about a file.

Can Gerbv replace the reference viewer?

For everyday inspection, yes — stacking layers, measuring, reporting and exporting are Gerbv’s job, done offline on your machine. For arbitrating how a disputed construct should render, no ordinary viewer replaces the reference implementation; that is what it is for.

Which should I use for confidential designs?

Gerbv, as the default: it runs entirely on your machine with no upload, so the design stays under your control. Reserve the online reference viewer for the occasional spec question, ideally with a minimal test file rather than a full confidential design.

Two different outputs

Follow the outputs and the difference is unmistakable. Gerbv’s outputs are for human eyes and human correspondence: the stacked layer view itself, measurements taken on the displayed image, statistics reports about the Gerber and drill codes in use, and exports to PNG, PDF, PS, SVG and DXF that you can attach to an email or a design review. FlatCAM’s output is for a machine: G-code toolpaths that a CNC mill follows to isolate traces and cut the board free. A viewer that produced toolpaths would be a hazard; a converter you could not visually verify against the original would be a different hazard. Each tool is shaped by its output.

Where each belongs in the workflow

If you order boards from a fab house, FlatCAM has no role in your week — the fab does its own manufacturing preparation — and Gerbv is the pre-order check: open the exact ZIP, stack the layers, confirm drills register with pads, measure the outline, then send it. The pre-order checklist is written for exactly that pass. If you mill prototypes at home, the order flips: FlatCAM is your production tool, and Gerbv becomes its proofreader. Viewing the Gerber set in an independent program before converting catches the classic milling-day disasters while they are still free to fix — a mirrored bottom layer, drills in the wrong unit, a missing outline, an extra board revision mixed into the folder. Converting a bad file produces a precisely machined bad board.

What Gerbv does and does not do

Gerbv is free, open source (GPL-2.0-or-later), and runs on Windows, macOS and Linux — get it from the download page. It views Gerber RS-274X layers, Excellon drill files and CSV pick-and-place files stacked together, works entirely offline, and needs no account. Its limits are worth stating because they define the partnership: it generates no G-code and drives no machine, it has no DRC, it renders in 2D only, and it does not read legacy RS-274D files. FlatCAM, for its part, is a converter with a viewing surface for its own work — its centre of gravity is toolpaths, not inspection reports, measurement-driven verification or documentation export.

Can one replace the other?

No, in either direction. Using FlatCAM as your only Gerber viewer means checking files inside the tool whose job is to transform them — the same single-tool blind spot that makes independent verification valuable everywhere else in this craft. Using Gerbv as a milling tool is simply impossible; it will show you a beautiful, correct board and then stop, leaving the copper uncut. The tools compose instead of competing: design, export, inspect in Gerbv, then either order from a fab or convert in FlatCAM and mill. The inspection step is cheap; both manufacturing routes are more expensive than the check that precedes them.

Cost and platforms

Money does not separate these two: both are free, and FlatCAM — like Gerbv — belongs to the open-source side of the bench. Gerbv runs on Windows, macOS and Linux, so the inspection half of the partnership can live on whatever machine you design on, while the milling half naturally lives wherever the CNC machine is driven from. That split is another reason the two tools compose so well in practice: check the files at your desk, on your main computer, then carry the verified set to the workshop machine for conversion — the files the mill receives are the files a human already approved.

Verdict: a sequence, not a contest

Choose Gerbv when the task is seeing, checking and documenting Gerber files. Choose FlatCAM when the task is turning those files into G-code for your own CNC mill. Choose both — in that order — if you mill at home and would like the board you designed to be the board the machine cuts.

Frequently asked questions

Can Gerbv create G-code for my CNC mill?

No. Gerbv is a viewer — it displays, measures and reports on Gerber, drill and pick-and-place files, and exports images and DXF. It produces no toolpaths. Converting Gerber files to G-code for isolation milling is FlatCAM’s job.

Can FlatCAM replace a Gerber viewer?

Not comfortably. FlatCAM’s purpose is conversion to G-code; it centres on toolpaths rather than inspection tooling like measurement-driven verification, code statistics and documentation export. Checking the set in a dedicated viewer such as Gerbv before converting is the safer sequence.

Do I need either tool if I order boards from a fab?

You do not need FlatCAM — the fab prepares its own manufacturing data. A viewer is still worthwhile: a ten-minute check of the ZIP in Gerbv, drills against pads and outline measured, catches errors while they cost nothing.

Platform and availability

ViewMate is a Windows viewer. Gerbv runs on Windows too — current builds are on the download page — and additionally on macOS and Linux. If your world is Windows end to end, platform is a wash. If a Mac sits on your desk, a Linux box drives the lab, or files get passed around a mixed team, Gerbv is the one that exists everywhere, with the same interface and the same checking habits on each machine.

The free tier question

With a freemium tool, the practical question is always where the line sits: which capabilities are in the free viewer, and which wait behind the Pro tier. ViewMate’s positioning is explicit that the paid Pro tier is where editing and DFM live. That is a coherent offer — view for free, pay when you need to change files or run deeper checks — but it means you should inventory your own habits before adopting it. If your routine is purely “open the set, verify it, order the board”, a free viewer may genuinely be all you need. If you regularly need to edit Gerber data or lean on DFM analysis, the Pro tier is the actual product for you, priced by its vendor. Gerbv removes the inventory exercise: measurement, layer stacking, statistics reports including aperture usage, and export to PNG, PDF, PS, SVG and DXF are all simply in the program, for every user, with no account and no upgrade prompt.

Where Gerbv’s limits are — stated plainly

Honesty cuts both ways, so here are Gerbv’s boundaries. It is a viewer first: it can select objects and delete them, translate and clean files via re-export, and panelise from the command line, but it is not a Gerber editor in the layout sense and offers nothing like a Pro tier’s editing bench. It has no DRC or DFM checking — its report windows give you statistics about the codes and apertures used, which is information for your judgement, not automated rule verdicts. It is 2D only, and it does not read legacy RS-274D files. If your work needs editing or DFM as a daily function, a commercial Pro tool is the honest recommendation. If your work needs verification — alignment, dimensions, layer content, drill registration — Gerbv’s toolkit is aimed exactly there, and the layer loading and alignment guide shows the workflow.

Formats and daily use

Gerbv views the standard fabrication trio — Gerber RS-274X layers, Excellon drill files and CSV pick-and-place files — stacked together so each layer can be checked against the others, works fully offline, and treats your files as yours: no upload, no account, nothing leaving the machine. For confidential contract designs that locality is a feature in itself. ViewMate’s free viewer covers the viewing role on Windows within the Pentalogix ecosystem, and its users’ natural growth path is upward into Pro rather than outward to other platforms.

Teams, teaching and handover

One underrated factor is what happens when the files change hands. A checking routine built on Gerbv can be handed to any colleague on any desktop platform with a link to the same free download — the instructions you write work identically on their machine. A routine built on a tiered commercial viewer travels with a licensing footnote: the colleague gets the free tier, and any step in your checklist that quietly depended on Pro behaviour breaks at the handover. For a solo practitioner this never arises; for a lab, a classroom or a small company standardising its pre-order checks, the tier-free tool is the easier standard to publish and keep.

Verdict: finished tool or first step?

Choose ViewMate if you are on Windows, you like the Pentalogix line, and editing or DFM in your future makes the Pro tier a sensible destination. Choose Gerbv if you want a complete, free viewer with no tiers, on any of the three desktop platforms, with measurement, reporting and export included from the start. Neither choice is a mistake; the mistake would be picking a tier boundary you have not looked at.

Frequently asked questions

Is ViewMate free?

ViewMate is a free Windows viewer from Pentalogix, with a paid Pro tier that adds editing and DFM. The free viewer covers viewing; the moment your work needs those editing or DFM capabilities, you are looking at the Pro tier. Gerbv is free with no tiers at all.

Does Gerbv offer DFM or editing like ViewMate Pro?

No. Gerbv is a viewer: it measures, stacks layers, reports statistics on Gerber and drill codes, and exports images and DXF, with only limited object deletion beyond that. It has no DFM/DRC checking and is not a layout editor — if you need those daily, a Pro-tier tool is the right buy.

Which runs on Mac or Linux?

Gerbv does — it ships for Windows, macOS and Linux. ViewMate is a Windows viewer, so on a Mac or Linux machine Gerbv is the one of the two that runs natively.

Getting started: install vs no install

Tracespace wins the first minute. On a borrowed machine, a locked-down work PC or a phone-adjacent moment of curiosity, a browser viewer is the only option that exists — there is nothing to download and no permission to ask for. Gerbv asks for one install, from the download page, and then repays it every time after: double-click, open the folder, done, with no network involved. Which cost matters more depends on frequency. Once a year, the browser wins. Every week, the installed tool wins.

Privacy: where do your files go?

A Gerber set is the complete manufacturing recipe for a board. With a desktop viewer the answer to “where do my files go” is boring in the best way: nowhere — Gerbv runs locally and works with no network connection at all. Browser viewers differ among themselves in how they handle uploads, and you should read each service’s own explanation before sending it a client’s design or an unreleased product. The desktop position needs no policy reading: the files stay on your disk, under your backup and confidentiality rules. For hobby boards that will be open-sourced next week this hardly matters; for contract work it can be the whole decision. Our Gerber viewer hub explains why we treat local viewing as the default for professional work.

Tooling depth: looking vs inspecting

Here the positioning diverges clearly. Tracespace is a viewer for rendering — it turns Gerber data into a clean SVG picture of your layers, and as its positioning states, it offers no measurement tools. Gerbv is built for inspection: stack several files, toggle and recolour layers, measure distances on the displayed image, and open report windows with statistics about the Gerber and drill codes in use, including aperture usage. It also exports the stacked view to PNG, PDF, PS, SVG and DXF for documentation and fab correspondence. If your question is “what does this board look like”, a renderer answers it. If your question is “is this board right — is the outline the size I designed, do the drills land on the pads, did anything land outside the profile” — you need measurement and reporting, and that is desktop territory. The routine is demonstrated in measuring distances in Gerbv.

File handling and repeat work

Gerbv views the full fabrication set together: Gerber RS-274X layers, Excellon drill files and CSV pick-and-place files, stacked for alignment checks — and it can open a whole directory of loadable files at once. It is a 2D viewer with honest limits: no 3D, no DRC, and no legacy RS-274D support. A browser session, by contrast, starts from zero each time: re-select the files, rebuild the stack, redo the setup. For a one-off look that is fine; for the tenth revision of the same board this week, the desktop tool’s persistence — same machine, same habits, same checklist — compounds.

Speed, once the novelty wears off

For a single file, the browser route can be genuinely quick — the site loads, the render appears, the question is answered. The balance shifts with set size and repetition. A fabrication package is a dozen files that must be selected together, stacked in the right order and revisited after every design tweak; on the desktop that becomes opening one folder in a tool that remembers nothing it should not and everything it should, while in the browser each revision restarts the ritual of gathering the same files into the same tab. Multiply by a week of iterations and the installed viewer’s head start in minute one becomes the browser’s deficit by Friday.

Verdict: choose by question

Choose Tracespace when you need a fast visual answer on a machine where you cannot or should not install anything, and the design is not sensitive. Choose Gerbv when the files are confidential, when the check involves measurements, drill alignment or reports, when you work offline or on restricted networks, or when Gerber checking is a recurring part of your week. The tools are not enemies: many engineers glance in the browser and verify on the desktop.

Frequently asked questions

Does Tracespace have measurement tools?

No — Tracespace View is a browser-based renderer that turns Gerber files into SVG images, and its positioning includes no measurement tools. If you need to measure an outline, hole or spacing, use a desktop viewer such as Gerbv, which measures on the displayed image.

Is it safe to upload Gerber files to a browser viewer?

That depends on the service’s handling and on the design’s sensitivity. A desktop viewer like Gerbv removes the question entirely: it runs offline and your files never leave your machine, which is why it is the safer default for client or unreleased work.

Can Gerbv open the same files as Tracespace?

Yes, and more of the set: Gerbv views Gerber RS-274X layers, Excellon drill files and CSV pick-and-place files together, so copper, drills and component positions can be checked in one aligned stack.

Platform: the first filter

For many readers the decision ends here. GerberLogix is a Windows-only viewer. If your bench machine runs Windows and always will, that is no obstacle. If you work across Windows and macOS, run Linux in the lab, or might hand files to a colleague on another system, Gerbv’s cross-platform builds — Windows, macOS and Linux from the same project — keep one tool, one set of habits and one checklist everywhere. You can get the current builds from the download page. A standalone overview of what to expect from a desktop viewer is on our Gerber viewer hub page.

Cost model: open source vs freemium

Gerbv’s model is simple to state: it is free software, the source code is public, and there is no tier above the one you downloaded. Nothing is held back for a paid edition, and nobody will prompt you to upgrade. GerberLogix follows the freemium pattern common in commercial tools: a free viewer to start with, and a Pro tier for users who want more from the same product. That model has a genuine advantage — a commercial roadmap and a vendor whose business is the tool itself — and a genuine question you should answer before settling in: are the capabilities you personally need inside the free tier, or in the Pro tier? Answer that from the vendor’s own current material, because tiers and their contents are the vendor’s to change. With Gerbv the equivalent question does not arise; the feature list you see is the whole product.

The viewing job itself

On the core task the two are comparable in intent: load a fabrication set, stack the layers, look carefully. Gerbv views Gerber RS-274X layers, Excellon drill files and CSV pick-and-place files, lets you stack several files, toggle and recolour layers, and take measurements on the displayed image. It opens report windows with statistics on the Gerber and drill codes used, including aperture usage, and it exports the view to PNG, PDF, PS, SVG and DXF — useful when a fab house or a client needs a picture rather than a lecture. It works entirely offline and needs no account, which matters when the design is someone else’s intellectual property. What Gerbv does not do is equally clear: it is a 2D viewer — no 3D, no DRC — and it does not read legacy RS-274D files. Judge GerberLogix’s free tier against the same checklist: formats in, measurement, reporting and export out.

Who each one suits

Choose Gerbv if you want a free viewer with no tiers, if you work on more than one operating system, if you value open-source licensing, or if your checking routine leans on measurement, statistics reports and image export. Choose GerberLogix if you are Windows-only, prefer a commercial product with a Pro upgrade path inside the same tool, and have confirmed the free tier covers what you need. In both cases the healthy habit is identical: view the exact ZIP you are about to send, layer by layer, before you order — the guide to loading and aligning layers shows the routine in Gerbv.

Support and continuity

The models differ here too, in ways worth weighing honestly. A commercial vendor offers a defined support channel and a product roadmap funded by its tiers — for some buyers that accountability is exactly what the Pro tier pays for. An open-source project like Gerbv offers different assurances: the source code is public, the program cannot be withdrawn from your machine or relicensed under your feet, and it keeps working offline whether or not any company continues to exist. Neither guarantee is imaginary; they are simply different kinds of safety, and which one you value depends on whether your work answers to procurement or to yourself.

The honest bottom line

This is not a contest with a trophy. It is a choice between an open-source, cross-platform viewer that is complete as downloaded, and a Windows commercial viewer whose free tier is a doorway to a paid one. If the doorway leads somewhere you want to go, that is a reasonable purchase. If you simply need to inspect fabrication files well, on any machine, without a sales funnel — that is exactly the job Gerbv exists for.

Frequently asked questions

Is GerberLogix really free?

GerberLogix is a free viewer with a Pro tier: the viewer itself is free, and a paid tier exists above it. Which capabilities live in which tier is set by the vendor, so check their current material before relying on a specific feature. Gerbv has no tiers — the free download is the whole program.

Does Gerbv run on the same machines as GerberLogix?

Gerbv runs on Windows, and also on macOS and Linux, where GerberLogix — a Windows-only viewer — does not. If your work is Windows-only, both are candidates; if it is not, Gerbv is the one that follows you.

Can both viewers open a full fabrication set?

Gerbv opens Gerber RS-274X layers, Excellon drill files and CSV pick-and-place files, stacked together for alignment checks and measurement. Test any viewer — including a free tier — against your own real ZIP before adopting it, since tier contents vary.