Credits

Separately loaded libraries (LGPL / MPL)

These libraries are shipped unmodified as separate files under /vendor/, with their licence next to them, and loaded only when a converter needs them. You may replace any of these files with your own build of the library.

• libheif (libheif-js) 1.23.5LGPL-3.0

  Dirk Farin / struktur AG and contributors; Emscripten build by Kiril Vatev

  HEIC/HEIF decoder (libheif with libde265), used only when the browser cannot open HEIC itself

  Shipped as: /vendor/libheif/1.23.5/ · You may replace this file with your own build of the library.

  Source: github.com/catdad-experiments/libheif-js/tree/v1.23.5

• LAME MP3 encoder (wasm-media-encoders) 0.7.0LGPL-2.0-or-later (LAME); wrapper MIT

  The LAME project; WebAssembly build by arseneyr

  MP3 encoder (LAME compiled to WebAssembly)

  Shipped as: /vendor/lame/0.7.0/ · You may replace this file with your own build of the library.

  Source: github.com/arseneyr/wasm-media-encoders/tree/v0.7.0

• Mediabunny 1.62.1MPL-2.0

  Vanilagy and contributors

  Reads and writes MP4, MOV, M4A, WebM, WAV, OGG and MP3 containers and drives the browser's WebCodecs

  Shipped as: /vendor/mediabunny/1.62.1/ · You may replace this file with your own build of the library.

  Source: github.com/Vanilagy/mediabunny/tree/v1.62.1

• FLAC decoder (wasm-audio-decoders, with codec-parser) 0.2.11MIT (decoder); bundles codec-parser, LGPL-3.0-or-later

  Ethan Halsall

  FLAC decoder fallback for browsers that cannot decode FLAC themselves

  Shipped as: /vendor/flac-decoder/0.2.11/ · You may replace this file with your own build of the library.

  Source: github.com/eshaz/wasm-audio-decoders/tree/master/src/flac

• Ogg Vorbis decoder (wasm-audio-decoders, with codec-parser) 0.1.20MIT (decoder); bundles codec-parser, LGPL-3.0-or-later

  Ethan Halsall

  Ogg Vorbis decoder fallback for browsers that cannot decode Vorbis (Safari)

  Shipped as: /vendor/ogg-vorbis-decoder/0.1.20/ · You may replace this file with your own build of the library.

  Source: github.com/eshaz/wasm-audio-decoders/tree/master/src/ogg-vorbis

Software in the converters

• jSquash (MozJPEG, libwebp, libavif, OxiPNG, resize)Apache-2.0 (codecs: IJG/BSD-style, BSD, BSD-2, MIT)

  Jamie Sinclair; codecs by Mozilla, Google, AOMedia and the squoosh authors

  JPEG, WebP, AVIF and PNG encoding and decoding, high-quality resizing.

  Source: github.com/jamsinclair/jSquash

• pdf.js (pdfjs-dist)Apache-2.0

  Mozilla and contributors

  Renders PDF pages to images. Its character maps, standard fonts and image decoders are served from /vendor/pdfjs/ with their licence files.

  Source: github.com/mozilla/pdf.js

• pdf-libMIT

  Andrew Dillon

  Builds PDFs from images.

  Source: github.com/Hopding/pdf-lib

• exifrMIT

  Mike Kovařík

  Reads photo metadata (date taken, orientation).

  Source: github.com/MikeKovarik/exifr

• piexifjsMIT

  hMatoba

  Writes the date taken back into JPGs, without location.

  Source: github.com/hMatoba/piexifjs

• gifencMIT

  Matt DesLauriers

  GIF encoding and colour quantisation.

  Source: github.com/mattdesl/gifenc

• gifuct-jsMIT

  Matt Way

  GIF decoding where the browser has no image decoder.

  Source: github.com/matt-way/gifuct-js

• fflateMIT

  Arjun Barrett

  Builds the ZIP for “all files at once”.

  Source: github.com/101arrowz/fflate

• AstroMIT

  The Astro Technology Company and contributors

  Builds the site (build time only).

  Source: github.com/withastro/astro

Data

• caniuse.com browser support dataCC BY 4.0

  Alexis Deveria and contributors

  Browser support facts in the format tables.

  Source: caniuse.com/

Typefaces

• Space GroteskSIL Open Font License 1.1

  Florian Karsten

  Display type.

• InterSIL Open Font License 1.1

  Rasmus Andersson

  Text and numbers.

• Noto Sans JP, Noto Sans KRSIL Open Font License 1.1

  Google

  Japanese and Korean pages.