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Gerber and NC drill file to SVG converter


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Gerber and NC drill file to SVG converter for Node and the browser.



$ npm install --save gerber-to-svg

var gerberToSvg = require('gerber-to-svg')
var converter = gerberToSvg(input, options, [callback])

See the API documentation for full details.

command line

  1. $ npm install -g gerber-to-svg
  2. $ gerber2svg [options] -- gerber_files


switch type what it does
-o, --out string specify an output directory
-q, --quiet boolean do not print warnings and messages
-p, --pretty int indent output with this length tabs (2 if unspecified)
-c, --color color give the layer this color (defaults to "currentColor")
-a, --append-ext boolean append .svg rather than replacing the existing extension
-f, --format array override coordinate decimal places format with '[INT,DEC]'
-z, --zero string override zero suppression with 'L' or 'T'
-u, --units string set backup units to 'mm' or 'in'
-n, --notation boolean set backup absolute/incremental notation with 'A' or 'I'
-z, --optimize-paths boolean rearrange trace paths by to occur in physical order
-b, --plot-as-outline boolean/number optimize paths and fill gaps smaller than 0.00011 (or specified number) in layer units
-v, --version boolean display version information
-h, --help boolean display this help text


  • $ gerber2svg gerber.gbr - convert gerber.gbr and output to stdout
  • $ gerber2svg -o out gerber.gbr - convert and output to out/gerber.svg
  • $ gerber2svg -o out -a gerber.gbr - output to out/gerber.gbr.svg

what you get

Since Gerber is just a vector image format, this library takes in a Gerber file and spits it out in a different format, namely SVG. This converter uses RS-274X and strives to be true to the latest format specification.

Everywhere that is "dark" or "exposed" in the Gerber (think a copper trace or a line on the silkscreen) will be "currentColor" in the SVG. You can set this with the "color" CSS property or the "color" attribute in the SVG node itself.

Everywhere that is "clear" (anywhere that was never drawn on or was drawn on but cleared later) will be transparent. This is accomplished though judicious use of SVG masks and groups.

The bounding box is carefully calculated as the file is being converted, so the width and height of the resulting SVG should be nearly (if not exactly) the real world size of the Gerber image. The SVG's viewBox is in 1000x Gerber units, so its min-x and min-y values can be used to align SVGs generated from different board layers.

Excellon / NC drill files do not have a completely clearly defined spec, so drill file parsing is lenient in its attempt to generate an image. It should auto-detect when a drill file has been entered. You may need to override parsing settings (see to get drill files to render properly if they do not adhere to certain assumptions. The library must make these assumptions because Excellon does not define commands for certain formatting decisions.

developing and contributing

Clone and then $ npm install. Please accompany all PRs with applicable tests (unit and/or visual). Please test your code in browsers, as Travis CI cannot run browser tests for PRs.


This module uses Mocha and Chai for unit testing, Istanbul for coverage, and ESLint for linting.

  • $ npm test - run the tests, calculate coverage, and lint
  • $ npm run test:watch - run the tests on code changes (does not lint nor cover)
  • $ npm run lint - lint the code (will be run as a pre-commit script)

browser testing

Browser tests are run with Zuul and Sauce Labs.

  • $ npm run test:browser - run the unit tests in a local browser
  • $ npm run test:sauce - run the units tests in several browsers using Open Sauce (Sauce Labs account and local .zuulrc required)

visual testing

The visual test suite made up of sample Gerber files and expected (looks-like) results. Expected SVGs are output from gerbv or hand-coded if the gerbv render is incorrect. Sample files live in test-visual/gerber and expected results live in test-visual/expected.

To run the visual tests, run $ npm run test:visual and point your browser to localhost:4242. Refreshing the page will re-render the files.