WebM to GIF. Free, private, in your browser
Convert a WebM video to an animated GIF in your browser. Nothing is uploaded. The file stays on your machine.
Best for: OBS WebM exports, browser MediaRecorder captures, screen-recording extensions
Settings: 12-15 FPS, 480 px wide. Drop to 360 px for reaction GIFs.
Watch out: Output too long, too wide, or too high-FPS. Trim tighter first, then lower width and FPS.
Pick a video
Drop a video here, or click to choose.
.mp4 · .mov · .webm · .mkv · .m4v · .avi
Quick answers
How to turn a WebM into a GIF
Drop the WebM in, trim to the exact moment you want, start around 15 FPS and 480 px wide, then download the GIF. Nothing is uploaded.
How to do it
Choose your WebM, trim away the lead-in and tail, preview if needed, then convert and save the GIF. The converter also accepts MP4, MOV, MKV, M4V and AVI.
Why use localgif.app
It runs entirely in your browser, so private WebM files stay on your machine. There is no upload step, no watermark, and no sign-up.
Common problems
Most WebM-to-GIF issues are really GIF-size issues: the output is too long, too wide, or too high-FPS. Trim tighter first, then lower width and FPS before giving up.
Suggested settings
Start at 12-15 FPS and 480 px wide for most clips. Drop to 360 px or 10-12 FPS for smaller reaction GIFs, and only go up to 24 FPS if the motion genuinely needs it.
Need a smaller file? Read how to reduce GIF file size or how to pick the right FPS.
About WebM
WebM is the web-native video container: VP8, VP9 or AV1 video wrapped in a Matroska-derived shell. It's what you get from OBS when you pick the WebM output, from browser MediaRecorder captures, and from most screen-recording extensions.
Because WebM is open and royalty-free, it's everywhere on the modern web. The WebAssembly FFmpeg build here decodes it in the page. Drop in a .webm, trim, and out comes a GIF, no upload step and no CLI to install.
How it works
- Pick a video. Drag one in or click the dropzone. MP4, MOV, WebM, MKV, M4V and AVI all work.
- Trim. Drag the two handles on the range slider to pick the exact clip you want. Only the trimmed portion is converted, which keeps things fast.
- Tune the output. Choose FPS and width, and pick Better (2-pass, custom palette) or Smaller (1-pass, default palette).
- Convert and download. The GIF is built in your browser and handed to you as a download. No server round-trip.
Under the hood this runs FFmpeg.wasm (the real FFmpeg compiled to WebAssembly) directly inside the page.
Why in-browser?
Most video-to-GIF tools ask you to upload your clip to a server you know nothing about. For anything sensitive (internal screen recordings, private moments, early product demos) that's a lot of trust for a free tool.
localgif.app never uploads your file. FFmpeg runs as WebAssembly inside the page, reads the file through the browser's file API, and writes the GIF straight back to you. You can disconnect your network after the page loads and it still works.
To get the fast multi-threaded build of FFmpeg we set the Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy headers so the browser grants us cross-origin isolation. Older browsers or misconfigured setups fall back to a slower single-threaded mode automatically.
FAQ
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.