Frequently Asked Questions
Is everything really processed in my browser?
Yes. Every tool on OhMyGIF runs as JavaScript and WebAssembly in your browser tab. Your GIFs and videos are never uploaded.
Do I need to sign up?
No account is needed. Just open a tool and drop a file in.
Is it free?
Yes — completely free. The site is supported by ads.
Why is there a 50 MB file size limit?
Browsers run out of memory on very large GIFs (decoding every frame to RGBA can use 10× the file size in RAM). 50 MB keeps things stable on the average laptop and phone.
Why does the GIF↔MP4 tool take longer the first time?
It downloads the ffmpeg.wasm runtime (~30 MB) on first use. After that the file is cached by the browser and conversions are much faster.
Can I use it offline?
Most tools work offline once the page is loaded — the JavaScript and HTML are cached. ffmpeg.wasm needs to have been loaded once before it works offline.
Why does my output GIF look slightly different (color banding)?
GIFs only support 256 colors per frame, so re-encoding always involves quantisation. Lowering the quality slider increases banding; raising it produces a larger file.
Why do I see ads?
Ads cover the running cost of the site (domain, hosting, time). Ads are clearly labeled and never block the tools.