Licences and attributions
What zgif is built from, and under which terms. Everything listed here runs inside your browser; the site has no server-side code beyond static hosting.
Delivered to your browser by this site
| Component | Version | Licence | Notes |
|---|---|---|---|
FFmpeg, compiled to WebAssembly by ffmpeg.wasm (@ffmpeg/core, @ffmpeg/core-mt) | core 0.12.10 · FFmpeg 5.1 series (libavcodec 59.37) | GPL-2.0-or-later | Built with --enable-gpl and these libraries: libass libfreetype libfribidi libmp3lame libopus libtheora libvorbis libvpx libwebp libx264 libx265 libzimg. The binaries are used unmodified; the complete corresponding source is the ffmpeg.wasm repository at the tag matching core 0.12.10, together with the FFmpeg and library sources it fetches. zgif's own code talks to FFmpeg only through the ffmpeg.wasm message interface. |
ffmpeg.wasm JavaScript wrapper (@ffmpeg/ffmpeg, @ffmpeg/util) | 0.12.15 · 0.12.2 | MIT | Copyright (c) Jerome Wu. |
Transformers.js (@huggingface/transformers) | 4.2.0 | Apache-2.0 | Copyright Hugging Face. Runs the AI model in a Web Worker. |
ONNX Runtime Web (onnxruntime-web) | 1.26.0-dev.20260416 | MIT | Copyright (c) Microsoft Corporation. Bundled with Transformers.js; WebGPU and WebAssembly backends. |
| Fonts: Sora (Jonathan Barnbrook) and IBM Plex Sans (IBM) | via Google Fonts | SIL Open Font License 1.1 | Loaded from fonts.googleapis.com / fonts.gstatic.com. |
Downloaded by your browser when you use Analyze
| Component | Version | Licence | Notes |
|---|---|---|---|
| Qwen3.5-0.8B (Qwen team, Alibaba Cloud), ONNX export onnx-community/Qwen3.5-0.8B-ONNX-OPT | q4f16 (WebGPU) or fp16/q4 (CPU) weights | Apache-2.0 | Fetched from huggingface.co directly by your browser, once, and cached there. zgif does not redistribute the weights. |
Not shipped, used to build
Vite, TypeScript, Vitest and the other development dependencies are used only to produce the site and are not delivered to browsers.
zgif itself
The zgif site and the zgif browser extension are © 2026 zgif. Their own source code is all rights reserved unless a licence file is published alongside it. The extension contains no third-party code.
Source offer
For the GPL-licensed FFmpeg build, the complete corresponding source is available from the links above. If you cannot obtain it there, ask via the contact on the front page and it will be provided.