mtx-decompressorMTX-compressed EOT to TrueType

A TypeScript library with no runtime dependencies. Extracts standard .ttf fonts from MicroType Express data in the browser and in Node.js.

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API reference

GitHub

EOT container parsing

Reads the Embedded OpenType header, including files whose declared version disagrees with their layout, and applies the container's compression and XOR flags.

Full MTX decoding

LZCOMP with adaptive Huffman coding, CTF reconstruction, and the hdmx and VDMX metric tables, assembled into a valid SFNT with recalculated checksums.

Browser and Node.js

Works on plain Uint8Array data. Hand the result to the FontFace API or write it to disk.

Live demo

Select or drop an .eot file. The font is extracted in your browser and is not uploaded anywhere.

Example

import { eotToTtf } from 'mtx-decompressor';

const eotBytes = new Uint8Array(await file.arrayBuffer());
const ttf = eotToTtf(eotBytes); // Uint8Array containing a TrueType font

See Getting started for installation and Usage for more examples.