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    2.0.5 • Public • Published

    TinySDF Build Status

    TinySDF is a tiny and fast JavaScript library for generating SDF (signed distance field) from system fonts on the browser using Canvas 2D and Felzenszwalb/Huttenlocher distance transform. This is very useful for rendering text with WebGL.



    Create a TinySDF for drawing glyph SDFs based on font parameters:

    const tinySdf = new TinySDF({
        fontSize: 24,             // Font size in pixels
        fontFamily: 'sans-serif', // CSS font-family
        fontWeight: 'normal',     // CSS font-weight
        fontStyle: 'normal',      // CSS font-style
        buffer: 3,                // Whitespace buffer around a glyph in pixels
        radius: 8,                // How many pixels around the glyph shape to use for encoding distance
        cutoff: 0.25              // How much of the radius (relative) is used for the inside part of the glyph
    const glyph = tinySdf.draw('泽'); // draw a single character

    Returns an object with the following properties:

    • data is a Uint8ClampedArray array of alpha values (0–255) for a width x height grid.
    • width: Width of the returned bitmap.
    • height: Height of the returned bitmap.
    • glyphTop: Maximum ascent of the glyph from alphabetic baseline.
    • glyphLeft: Currently hardwired to 0 (actual glyph differences are encoded in the rasterization).
    • glyphWidth: Width of the rasterized portion of the glyph.
    • glyphHeight Height of the rasterized portion of the glyph.
    • glyphAdvance: Layout advance.

    TinySDF is provided as a ES module, so it's only supported on modern browsers, excluding IE.

    <script type="module">
    import TinySDF from '';

    In Node, you can't use require — only import in ESM-capable versions (v12.15+):

    import TinySDF from '@mapbox/tiny-sdf';


    npm test  # run tests
    npm start # start server for the demo page


    This implementation is licensed under the BSD 2-Clause license. It's based directly on the algorithm published in the Felzenszwalb/Huttenlocher paper, and is not a port of the existing C++ implementation provided by the paper's authors.


    npm i @mapbox/tiny-sdf

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