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Frame Rate, Slow Motion & Time-lapse
Change frame rate, interpolate smooth motion, make slow motion, time-lapse or a stop-motion look.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Frame Rate, Slow Motion & Time-lapse works
Video work runs in ffmpeg.wasm, the FFmpeg toolkit compiled to WebAssembly (GPL build, loaded as a separate engine file of about 30 MB the first time, then cached).
Input: MP4, MOV, WEBM, MKV, AVI. Output: MP4.
How to use Frame Rate, Slow Motion & Time-lapse
- Drop a video onto Frame Rate, Slow Motion & Time-lapse.
- The first run downloads the ffmpeg engine (about 30 MB, once).
- Set your range, format or quality options.
- Process it (progress is shown live), then download.
Tips
- Shorter clips and lower resolutions process much faster.
- Processing speed depends on your CPU; plug in laptops for long jobs.
- Keep the tab in the foreground while encoding.
Frame Rate, Slow Motion & Time-lapse FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
Related tools
- Video Speed: Speed up or slow down a video from 0.25× to 4×.
- Freeze Frame: Hold any moment of a video for a few seconds, then let it carry on.
- Stabilize Video: Reduce camera shake in handheld clips with an optional zoom to hide moving edges.
- Video Trimmer: Trim and cut clips with a visual timeline, no re-upload.