Why is the first run slower?

This tool needs a processing engine that is downloaded once and then cached: ffmpeg.wasm: about 30 MB, fetched once from the jsDelivr CDN and cached by your browser. Only the engine is downloaded. Your file never leaves your device.

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.

Home / Video / Video Compressor

Video Compressor

Compress videos with quality presets and target resolution.

Free, no uploads, no sign-up. Runs 100% in your browser.

How Video Compressor works

Video Compressor runs FFmpeg (compiled to WebAssembly) in a worker and re-encodes your clip with H.264 at a quality level (CRF) and optional lower resolution, so files shrink dramatically while staying watchable.

Input: MP4, WEBM, MOV, MKV, AVI.

How to use Video Compressor

Drop a video onto Video Compressor.
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

720p is plenty for messaging apps and email.
Lower frame rates (e.g. 24 fps) also cut size for screen recordings.

Video Compressor FAQ

Why is the first run slower?: This tool needs a processing engine that is downloaded once and then cached: ffmpeg.wasm: about 30 MB, fetched once from the jsDelivr CDN and cached by your browser. Only the engine is downloaded. Your file never leaves your device.
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 Trimmer: Trim and cut clips with a visual timeline, no re-upload.
Video Converter: Convert between MP4, WEBM, MOV, MKV and AVI.
Extract Audio: Pull the soundtrack from a video as MP3, WAV or AAC.
Screen Recorder: Record screen + webcam bubble with mic and system audio.