Open Source Licenses

The GIF converter, compressor and editor tools on ChatGPTGIF.net run inside your browser. The heavy lifting is done by open source software that we did not write and have not changed. This page lists it, the licenses it comes under, and where to get the source code. The AI GIF generator pages are not covered here: they run on servers, not in your browser.

What runs in your browser

When you use a converter, compressor or editor tool, your browser downloads these unmodified packages and runs them on your device. Your files are not uploaded.

• @ffmpeg/ffmpeg 0.12.15, the JavaScript wrapper of ffmpeg.wasm, used for video to GIF and GIF to MP4, WebM or MOV. License: MIT.
• @ffmpeg/core 0.12.10, FFmpeg n5.1.4 built as WebAssembly by the ffmpeg.wasm project, served by the jsDelivr CDN. License: GNU General Public License, version 2 or later, because it is built with --enable-gpl and includes GPL libraries.
• gifsicle-wasm-browser 1.5.19, Gifsicle 1.92 by Eddie Kohler compiled to WebAssembly, used to compress, resize, crop, rotate, flip, reverse and re-time GIFs. Gifsicle's license: GNU General Public License, version 2. The WebAssembly wrapper: MIT.
• gifuct-js 2.1.2 (reads GIF frames) and its dependency js-binary-schema-parser. License: MIT.
• gifenc 1.0.3 (writes GIF frames). License: MIT.
• fflate 0.8.3 (builds the ZIP of PNG frames). License: MIT.
• Anton (the Impact-style caption font), by Vernon Adams. License: SIL Open Font License 1.1.

Libraries inside @ffmpeg/core

• FFmpeg n5.1.4: LGPL-2.1-or-later, GPL-2.0-or-later as built here
• x264 (H.264 encoder): GPL-2.0-or-later
• x265 (HEVC encoder): GPL-2.0-or-later
• libvpx (VP8 / VP9): BSD-3-Clause
• LAME (MP3): LGPL-2.0-or-later
• libogg, libvorbis, libtheora: BSD-3-Clause
• Opus: BSD-3-Clause
• zlib: zlib License
• libwebp: BSD-3-Clause
• FreeType: FreeType License (FTL) or GPL-2.0
• FriBidi: LGPL-2.1-or-later
• HarfBuzz: MIT ("Old MIT")
• libass: ISC
• zimg: WTFPL

Source code

• ffmpeg.wasm: the exact source of the build we use, including the Dockerfile and the build scripts that pin every library version, is the ffmpeg.wasm v12.15 release, which publishes @ffmpeg/core 0.12.10. FFmpeg itself is the n5.1.4 tag.
• Gifsicle: the WebAssembly build and its build files are in the gifsicle-wasm-browser repository (npm release 1.5.19), built from Gifsicle 1.92 by way of wasm-codecs/gifsicle.
• The MIT libraries above are in their linked repositories, and unchanged on npm.

If any of those links stops working, write to support@chatgptgif.net and we will send you a complete copy of the corresponding source code, at no charge beyond the cost of delivering it. This offer is valid for three years from the last time we served the software.

Your rights

The GPL lets you run, study, share and change this software. It comes with no warranty. The full terms are in the GNU General Public License, version 2. The rest of ChatGPTGIF.net, the website around the tools, is our own work and is not covered by these licenses.