# Online Gerber Viewer Free online Gerber viewer. Open a Gerber package or ZIP in your browser to inspect copper, solder mask, silkscreen and drill layers, flip between top and bottom views, and zoom into the detail — nothing is uploaded to a server. Open a Gerber package straight in your browser — **no sign-up, no upload to a server**. Inspect the full stack, flip between **top and bottom views**, and toggle copper, solder mask, silkscreen and drill layers one at a time before you send the board out for manufacturing. **This is a standalone tool built for the EE community, separate from the Flux product.** ## Drop your Gerber files here Add the whole Gerber package — copper, solder mask, silkscreen, board outline and drill files — or a single ZIP archive straight from your CAD tool. Upload Gerber Files RS-274X Gerber, Excellon drill, KiCad / Altium / Eagle exports, .zip ### Load from a URL Paste a direct link to a Gerber ZIP or a single Gerber file. ### No files handy? View Demo Loads a complete sample Gerber package into the viewer so you can try every control. - Top Copper - Mid-Layer - Bottom Copper - Solder Mask - Silkscreen - Solder Paste - Board Outline - Drill Reading your Gerber files… Demo Board Board Close Board Layers Top Bottom 100% Scroll to zoom · drag to pan · double-click to zoom in ## Check the files here. Change the board in Flux. A Gerber viewer verifies the files you're about to send. **This viewer is built for quick file checks outside Flux.** In Flux, you inspect and fix everything live — schematic, layout, 2D and photorealistic 3D in one project, so you're not exporting just to see what you changed. - **Skip the export step** — every edit is live on the layout and in 3D - **Schematic and PCB in one browser project,** with DRC as you route - **Real parts and live pricing,** then a complete manufacturing package you can check right here [Try Flux for Free](https://www.flux.ai/signup) ### In Flux How do I export the Gerber of this project so I can check it on my favorite Gerber viewer? ![Flux Copilot](https://www.flux.ai/p/assets/site/6446c14683b3da60aea75bce_copilot-icon-filled-white.svg) You can — **File → Export → Manufacturing files** gives you Gerbers, drill, BOM and pick-and-place in one ZIP. Worth knowing though — in Flux you don't have to export just to look at the board: - The canvas already shows **copper, mask, silkscreen and drills**, per layer, in 2D and 3D - **DRC runs as you route,** so clearance and drill problems show up while you design - Anything you spot you can **fix in place** — then preflight the exported package before you order Want me to run a design review on this board first? ## How the viewer works Powered by the open-source tracespace Gerber toolchain, running entirely client-side. 01 ### Add your files Drop in the Gerber package your CAD tool exported, a ZIP archive, or a direct link. Each file is identified by name and content, so KiCad, Altium, Eagle and Fusion exports all just work. 02 ### Rendered in your browser The Gerber and Excellon files are parsed and plotted to vector graphics locally. Nothing is uploaded, so proprietary boards stay on your machine — and the render stays sharp at any zoom level. 03 ### Inspect layer by layer Switch between the full stack, top view and bottom view, isolate a single layer, and pan or zoom into the detail. Layer colours match the Flux PCB editor's stackup so the board reads the same way. ## Online Gerber viewer FAQ ### What is a Gerber file? A Gerber file (RS-274X) is the vector image of one layer of a printed circuit board — top copper, bottom copper, solder mask, silkscreen, paste stencil or board outline. A board is exported as a set of Gerbers plus an Excellon drill file describing every hole. Together that package is what a fab house needs to build the board, which is why it's worth previewing before you order. ### How do I open a Gerber file online? Drop the whole Gerber package — or a ZIP of it — onto this page. The files are parsed and rendered in your browser, so you get an interactive board within a second or two without installing CAM software or creating an account. You can also paste a direct URL to a ZIP, or load the bundled demo board to try the viewer first. ### Are my Gerber files uploaded to a server? No. Parsing and rendering both happen locally in your browser using the open-source tracespace toolchain — the files are read with the browser's own File API and never leave your machine. That makes it safe to check client or NDA boards. Loading from a URL is the one exception: the browser fetches that link directly from wherever you pointed it. ### Which files should I upload? Upload everything your CAD tool put in the fab folder: top and bottom copper, any inner copper layers, top and bottom solder mask, silkscreen, solder paste, the board outline (edge cuts), and the drill files. The board outline matters most — it defines the board shape the other layers are clipped to. A ZIP straight from KiCad, Altium, Eagle, Fusion or your fab's download works as-is. ### Can I view a Gerber ZIP archive? Yes. Drop the ZIP in and the viewer unpacks it in the browser, keeps the Gerber and drill files and ignores the rest (readmes, pick-and-place, BOM). Nested folders are fine — files are matched on their names, not their location in the archive. ### How do I check the bottom side of the board? Click Bottom. It mirrors the board and switches to the bottom copper, mask, silkscreen and paste layers, which is exactly what you want when checking bottom-side placement or reading mirrored silkscreen. Top does the same for the top side, and Layers shows every layer at once. You can still toggle individual layers afterwards. ### Can I inspect a single Gerber layer on its own? Yes. Click a layer's row in the panel and everything else is hidden, so you can check one layer's geometry — a paste stencil or a drill map, for example — with nothing else in the way. Click it again to go back to the previous set of layers, or hit Reset view to return to the full stack. ### Why does my board render with no outline or the wrong shape? The board shape comes from the outline layer (often called Edge\_Cuts, .gko or .gm1). If it's missing from the upload, or the outline isn't a closed loop, the viewer falls back to the bounding box of the other layers and the board edge won't look right. Re-export with the outline layer included and make sure it forms one closed contour. ### Do I need a Gerber viewer if I use Flux? Usually no. Flux lets you inspect your board live — across schematic, PCB layout, and 3D — and fix issues before exporting. This viewer is mainly useful for checking Gerber files from other tools or final exports. ## Design the whole board with AI From schematic to routed copper to manufacturing files — let Flux Copilot work alongside you. [Try Flux for Free](https://www.flux.ai/signup)