Video
Video Compressor
Compress videos with a quality-first preset, original resolution and frame rate. Test a short sample, compare sizes and download an MP4.
Compression is lossy; no preset can guarantee zero visible change or a smaller file. This tool supports SDR video up to 4K and 60 fps. HDR and wide-gamut clips are rejected to protect their colours. Subtitles, chapters and source metadata are omitted. Save your download before leaving this page.
Compressor credits & source
FFmpeg.wasm with x264. Versions, licenses and source code.
How to use Video Compressor
- 1Choose an MP4, MOV, WebM or MKV clip up to 200 MB and 5 minutes.
- 2Start with Minimal quality loss and Keep original. Test a 5-second sample to inspect quality and estimate the full size.
- 3Compress the full video, compare the result and download your MP4 before leaving the page.
Before you start
How do I minimise quality loss?
Use Minimal quality loss with Keep original resolution. The encoder uses H.264 constant-quality compression at CRF 18 and keeps the frame rate. AAC audio is copied without re-encoding. Video encoding is still lossy, so inspect a sample before compressing the whole clip.
Will the file always get smaller?
No. Efficiently encoded videos can grow, especially when converting HEVC or AV1 to H.264. The tool shows the actual output size. A sample gives only an estimate because other scenes can compress differently.
Does my video leave my device?
No. The compressor runs in a browser worker. It runs independently of the processing queue. The first run downloads an approximately 31 MB processing engine from BigSplit.
Which videos are supported?
SDR clips up to 200 MB, 5 minutes, 4K resolution and 60 fps. Supported decoding depends on the codec inside MP4, MOV, WebM or MKV. HDR and wide-gamut clips are rejected to avoid changing their colours.
What is kept in the output?
The first video track and, unless removed, the first audio track. The output is MP4 with H.264 video. AAC audio is copied; other audio converts to AAC. Subtitles, chapters and source metadata are omitted. Odd dimensions can gain a one-pixel border.
Why does it take a while?
Compression runs on your own device and can take several minutes. Desktop browsers work best. Keep the tab open; use Cancel to stop, or try 1080p or 720p for a large clip.