Open source licenses
The tools on this site use the open source software listed below. Each part keeps its own license. The license texts and notices below are in English, as they are legally binding in that form.
All license texts
Video tools
FFmpeg video engine (@ffmpeg/core and @ffmpeg/core-mt) 0.12.10
- License: GPL-2.0-or-later
- Project: https://ffmpeg.org/
- Source code and build recipe for this build: https://github.com/ffmpegwasm/ffmpeg.wasm/tree/71aa99d37c02a7b4c435275ca9ef50e612f6efa1
The video tools run FFmpeg in your browser. FFmpeg is free software licensed under the GPL. Here is the license, the exact source code and the build details.
- Loaded at run time from cdn.jsdelivr.net, pinned to version 0.12.10. Licensed under the GNU General Public License v2.0 or later. You may follow version 2 (gnu.org, copy on this site) or version 3 (gnu.org, copy on this site).
- The source link above is the release commit of core 0.12.10. The build recipe is the Dockerfile and build/*.sh in that tree. x264 upstream: https://code.videolan.org/videolan/x264.
- Configure line:
--enable-gpl --enable-libx264 --enable-libx265 --enable-libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libopus --enable-zlib --enable-libwebp --enable-libfreetype --enable-libfribidi --enable-libass --enable-libzimg
Libraries built into the FFmpeg engine
- FFmpeg n5.1.4, GPL-2.0-or-later (built with --enable-gpl), https://github.com/FFmpeg/FFmpeg/tree/n5.1.4
- x264, GPL-2.0-or-later, https://github.com/ffmpegwasm/x264/tree/33cac6b77d5b9259c552156013a817ab23119612 (The upstream Dockerfile names a moving branch here, so the build reference is not pinned. Source shown is the head of branch 4-cores observed on 2026-09-30.)
- x265 3.4, GPL-2.0-or-later, https://github.com/ffmpegwasm/x265/tree/3.4
- libvpx v1.13.1, BSD-3-Clause with the WebM patent grant, https://github.com/ffmpegwasm/libvpx/tree/v1.13.1
- Opus v1.3.1, BSD-3-Clause, https://github.com/ffmpegwasm/opus/tree/v1.3.1
- LAME, LGPL-2.0-or-later (GNU Library General Public License, version 2 or later), https://github.com/ffmpegwasm/lame (The upstream Dockerfile names a moving branch here, so the build reference is not pinned. Source shown is branch master as observed on 2026-09-30.)
- libogg v1.3.4, BSD-3-Clause, https://github.com/ffmpegwasm/Ogg/tree/v1.3.4
- libvorbis v1.3.3, BSD-3-Clause, https://github.com/ffmpegwasm/vorbis/tree/v1.3.3
- libtheora v1.1.1, BSD-3-Clause, https://github.com/ffmpegwasm/theora/tree/v1.1.1
- zlib v1.2.11, zlib License, https://github.com/ffmpegwasm/zlib/tree/v1.2.11
- libwebp v1.3.2, BSD-3-Clause, https://github.com/ffmpegwasm/libwebp/tree/v1.3.2
- FreeType 2.10.4, FreeType License or GPL-2.0-or-later, https://github.com/ffmpegwasm/freetype2/tree/VER-2-10-4
- FriBidi 1.0.9, LGPL-2.1-or-later, https://github.com/fribidi/fribidi/tree/v1.0.9
- HarfBuzz 5.2.0, MIT ("Old MIT"), https://github.com/harfbuzz/harfbuzz/tree/5.2.0
- libass 0.15.0, ISC, https://github.com/libass/libass/tree/0.15.0
- zimg 3.0.5, WTFPL, https://github.com/sekrit-twc/zimg/tree/release-3.0.5
@ffmpeg/ffmpeg 0.12.15
- License: MIT
- Copyright (c) 2019 Jerome Wu
- Project: https://github.com/ffmpegwasm/ffmpeg.wasm
@ffmpeg/util 0.12.2
- License: MIT
- Copyright (c) 2019 Jerome Wu
- Project: https://github.com/ffmpegwasm/ffmpeg.wasm
PDF tools
pdf-lib 1.17.1
- License: MIT
- Copyright (c) 2019 Andrew Dillon
- Project: https://pdf-lib.js.org
PDF.js (pdfjs-dist) 6.3.289
- License: Apache-2.0
- Mozilla Foundation and contributors. Includes OpenJPEG, JBIG2, QCMS, Liberation and Foxit fonts, CMaps and ICC profiles under their own licenses.
- Project: https://mozilla.github.io/pdf.js/
qpdf (via @neslinesli93/qpdf-wasm) 0.3.0
- License: Apache-2.0 (qpdf); ISC (wasm wrapper)
- qpdf is copyright (c) 2005-2021 Jay Berkenbilt, 2022-2026 Jay Berkenbilt and Manfred Holger
- Project: https://github.com/qpdf/qpdf
Image tools
jSquash (@jsquash/jpeg, webp, avif, png, oxipng) jpeg 1.6.0, webp 1.5.0, avif 2.1.1, png 3.1.1, oxipng 2.3.0
- License: Apache-2.0
- Project: https://github.com/jamsinclair/jSquash
MozJPEG / libjpeg-turbo codec bundled in @jsquash/jpeg 1.6.0
- License: IJG and BSD-style licenses
- Project: https://github.com/mozilla/mozjpeg
libwebp codec bundled in @jsquash/webp 1.5.0
- License: BSD-3-Clause
- Copyright (c) 2010, Google Inc.
- Project: https://chromium.googlesource.com/webm/libwebp
libavif codec bundled in @jsquash/avif 2.1.1
- License: BSD-2-Clause
- Copyright 2019 Joe Drago
- Project: https://github.com/AOMediaCodec/libavif
oxipng codec bundled in @jsquash/oxipng 2.3.0
- License: MIT
- Copyright (c) 2016 Joshua Holmer
- Project: https://github.com/shssoichiro/oxipng
Other software
fflate 0.8.3
- License: MIT
- Copyright (c) 2026 Arjun Barrett
- Project: https://github.com/101arrowz/fflate
Preact (with @preact/signals) 11.0.0
- License: MIT
- Copyright (c) 2015-present Jason Miller; Copyright (c) 2022-present Preact Team
- Project: https://preactjs.com
Astro (with @astrojs/preact) 7.3.5
- License: MIT
- Copyright (c) 2021 Fred K. Schott
- Project: https://astro.build
Bricolage Grotesque font (@fontsource-variable/bricolage-grotesque) 5.3.0
- License: OFL-1.1
- Copyright 2022 The Bricolage Grotesque Project Authors (https://github.com/ateliertriay/bricolage)
- Project: https://github.com/ateliertriay/bricolage
Trademark
FFmpeg is a trademark of Fabrice Bellard; this site is not affiliated with or endorsed by the FFmpeg project.