1 · Add your video
No data is transmitted; all encoding happens on your device. Open source on GitHub.
Drop a video here or click to choose
MP4, WebM, MOV — anything your browser can play.
Turn it into a high-quality animated GIF, entirely in your browser via WebAssembly. Your video is never uploaded anywhere.
2 · Trim & cut
Use the timeline above: click or drag to scrub, step frame‑by‑frame with the ←/→ keys, drag the green handles to crop the ends, and mark a cut start then “Remove section” to delete a middle part (click a red strip to undo). The GIF is built from the kept (green) parts, played back‑to‑back.
3 · Crop & output size
4 · Style
Applied left → right: pick an input, map it through a colormap, then a colour filter.
How the tone curve & colormaps work
Drag min and max inward along the bottom to clip the input range and boost contrast; drag mid up/down to bend the gamma (midtones — moving min/max keeps the current gamma). The grey strip below the curve is the input; the colour strip on its left is the output colormap. Both flip with invert input / reverse colormap. Histograms are the cropped ROI (input behind the curve, output on the right, before the GIF's own quantization). Toggle log scale to reveal the dark end.A colormap recolours the image: each pixel’s chosen channel (0–255) is looked up in the colormap. Great for heatmaps and scientific data. Colormaps from matplotlib.
5 · Logo / watermark
Drop a logo image or click to choose
A PNG with transparency works best — optional
6 · Export
Pick a format — each makes three sizes from the same frames. WebP & APNG are far smaller/sharper than GIF. Creating one replaces the previous result.
Your animation
Three sizes — pick whichever is small enough. Speed & loop changes update them instantly.
🤖 100% vibed
No tracking. No uploads. No sign-up. No ads. This whole thing was vibe-coded with Claude Code and runs entirely on your device.
If it saved you a trip to some sketchy online converter, give it a ⭐.
⭐ Star it on GitHubAbout & license
Everything here runs locally in your browser through WebAssembly. Your video is never uploaded — no server ever sees them.
The GIF encoder is gifski by Kornel Lesi ński, compiled to WebAssembly via gifski-wasm and bundled directly with this page.
WebP and APNG output use @jsquash/webp (Google’s libwebp, compiled to WebAssembly) and UPNG.js with pako — all bundled with this page. The animated WebP is muxed and APNG/WebP timing is patched by this page’s own code.
License: gifski and gifski-wasm are licensed under the GNU Affero General Public License v3.0 (AGPL-3.0). Because this page distributes the gifski WebAssembly binary to you over a network, the AGPL requires that the corresponding source remain available to you. The bundled copy of the license is included here, the encoder source is at the gifski and gifski-wasm repositories linked above, and the full source of this page is on GitHub. The WebP encoder (libwebp / @jsquash/webp) is Apache-2.0; UPNG.js and pako are MIT (UPNG, pako).
Built on
- gifski — the GIF encoder (Kornel Lesi ński)
- gifski-wasm — the WebAssembly build
- @jsquash/webp & libwebp — the WebP encoder (Apache-2.0)
- UPNG.js + pako — the APNG encoder (MIT)
- wasm-bindgen & Rust → WebAssembly
- matplotlib colormaps (viridis, plasma, …)
- Turbo colormap (Google)
- ColorBrewer (Cynthia Brewer) — Reds/Blues/…
- Canvas & HTML media APIs
Inspired by
- Squoosh — Google’s in-browser image compressor; the gold standard for client-side WASM tools
- ffmpeg.wasm — FFmpeg in the browser
- gifsicle-wasm-browser
- ezgif — the classic online GIF toolbox (server-side)
- The local-first / privacy-respecting web-tools movement
- Vibe-coded with Claude Code (Anthropic)