# Gerber Viewer > Load the Gerber + drill files of a PCB (multi-file or .zip) and view the composed layers, with pours and clearances rendered correctly. Practice: elettronica Status: Proto v0.1 Tag: Gerber, PCB, Viewer, Layer, EDA Method, assumptions and limits: Page: --- Printed-circuit-board viewer: drop the RS-274X Gerber files and the Excellon drill of a board (or a .zip exported from the CAD) and see the layers overlaid — copper, solder mask, silkscreen, drill, outline — with per-layer toggles, per-side colours, transparency, zoom/pan and PNG export. Automatic layer recognition with manual assignment for ambiguous cases; GPU rasterization (WebGL2) that renders pours and clearances correctly. This file is a **descriptor**, not the tool's documentation: it says what the tool computes and by what method, in summary. Formulas, assumptions, validity conditions and limits are in the wiki linked above. The tool runs in the browser at the page given.