When to convert to GIF — and when to convert away from it
GIF’s superpower is compatibility: it autoplays, loops and works in virtually every browser, chat app, email client, forum and CMS without a player. Its weaknesses are size and colour — at most 256 colours per frame, no audio, 1-bit transparency and 1980s compression. Convert to GIF when the destination only accepts images or when you need guaranteed autoplay everywhere; keep clips short and modest in size.
Convert from GIF when you need efficiency or features GIF lacks: GIF to MP4 for social media (typically 5–10× smaller), GIF to APNG for full alpha transparency, GIF to AVIF for tiny stills, GIF to PNG for lossless frames, and Add Music to GIF when it needs sound.
How the conversions work without uploading
Every converter uses technology built into modern browsers or compiled to WebAssembly. Video is decoded by the browser’s own player and re-encoded with WebCodecs; GIFs are decoded and encoded in JavaScript on a background worker with per-frame palettes and frame diffing; HEIC (libheif), AVIF encoding (libavif) and PDF rendering (pdf.js) run as WebAssembly or JavaScript libraries inside the page.
The result is the same as a server-based converter — without the upload wait, the file-size cap or the privacy risk. If you’re not sure a GIF is healthy before converting it, the GIF Tester reports its frames, timing and loop settings.