Is my video uploaded anywhere?

No. Your file never leaves your device. Conversion runs entirely in your browser using FFmpeg compiled to WebAssembly, so there is no server to upload to.

Which video formats can I convert?

MP4, MOV, WebM, MKV, M4V and AVI all work in most browsers. Anything your build of FFmpeg can decode will work, since the same FFmpeg code runs inside the page.

What's the maximum file size?

There is no hard limit, but everything happens in your browser's memory. A few hundred MB is usually fine on desktop; mobile browsers have tighter memory caps. Trimming to only the clip you need is the easiest way to stay fast.

Why is the GIF so large compared to the video?

GIF is an old, lossless, 256-color-per-frame format with no real inter-frame compression. A 5-second 1080p clip that is 2 MB as MP4 can easily be 20 MB as GIF. To shrink it, lower the FPS, reduce the width, and trim tighter.

What FPS and width should I pick?

15 FPS and 480 px wide is a good default for social and chat apps. Drop to 10 FPS if the motion is slow or you want a smaller file. Go up to 24-30 FPS only if the motion genuinely needs it.

Does it work offline or on mobile?

After the first load the page and FFmpeg core are cached, so conversion works without a network connection. It runs on mobile browsers, but memory is more limited, so keep clips short and widths modest.

Why does my browser need to be up to date?

Multi-threaded WebAssembly needs cross-origin isolation (COOP/COEP headers) and SharedArrayBuffer. Older browsers fall back to a slower single-threaded mode. A current Chrome, Edge, Firefox or Safari 16+ gets the fast path.

Is it really free? Any watermark?

Yes, free. No sign-up, no watermark, no usage limit. There is no server to pay for because nothing is uploaded.

Privacy

How localgif.app handles (or does not handle) your data.

Nothing is uploaded

Your video file stays on your device. The conversion runs inside your browser using FFmpeg compiled to WebAssembly. There is no server that receives, processes, or stores your file. You can disconnect from the network after the page loads and conversion still works.

Analytics

The site collects anonymous, coarse-grained usage metrics to understand how the tool is used and catch problems. Specifically:

Events like "a conversion started" or "a conversion finished" are logged with coarse metadata: file extension (not filename), file size bucket, output FPS, width, quality setting, and trim length.
Never sent: filenames, file contents, IP addresses, user agent strings, or any personally identifiable information.
Feedback comments are sent only when you choose to submit them. Avoid including personal information in feedback.

Local storage

The site stores your theme preference (light or dark) in localStorage. No cookies are used for tracking.

Third-party resources

The page loads a few external resources:

Google Fonts for the Inter and JetBrains Mono typefaces. Google may see a request from your IP to load these fonts.
jsdelivr CDN for the FFmpeg WebAssembly core files (ffmpeg-core.js, .wasm, .worker.js). jsdelivr may see a request from your IP to load these files.

Both are standard public CDNs. Neither receives your video file or any conversion data.

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