Every PCB workflow needs a Gerber viewer — the tool that shows you the fabrication files exactly as the factory will receive them. The good news is that you do not have to pay for one. The honest news is that “free Gerber viewer” covers very different kinds of software: desktop applications, viewers bundled inside larger suites, browser tools, manufacturer tools and one specialist converter. This roundup compares the main free options using what each tool actually is, so you can pick by how you work rather than by marketing. Our own recommendation is straightforward: for private, offline desktop viewing, Gerbv is the tool this site documents — but read the table first, because for some jobs another tool on this list is the better fit.
At a glance
| Viewer | Platform | Price model | Offline / online | Best for |
|---|---|---|---|---|
| Gerbv | Windows, macOS, Linux | Free and open source (GPL-2.0-or-later) | Offline desktop | Private inspection and measurement without uploads |
| KiCad GerbView | Windows, macOS, Linux (with KiCad) | Free, part of the KiCad suite | Offline desktop | KiCad users who already run the suite |
| Tracespace View | Web browser | Free, open source, web-based | Online | A quick visual look with nothing to install |
| Ucamco Reference Gerber Viewer | Web browser | Free online reference tool | Online | Checking a file against the format maintainer’s own rendering |
| Mayhew Labs 3D Gerber Viewer | Web browser | Free online tool | Online | Seeing a board in 3D before it exists |
| ViewMate | Windows | Free tier of a commercial tool | Offline desktop | Windows users who may later want paid editing and DFM features |
| FlatCAM | Desktop | Free and open source | Offline desktop | Turning Gerber files into CNC isolation-milling jobs |
| GerberLogix | Windows | Free viewer with a Pro tier | Offline desktop | Windows-only viewing with an upgrade path |
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.