How to use Compress video
- Select your video.
- Choose quality and optional max width.
- Export a smaller MP4.
What this tool does
The video compressor reduces file size by re-encoding the selected video as MP4. It is useful when a file is too large for email, class platforms, web forms, chat, or quick sharing.
Use this tool when you care about a quality setting more than a strict MB number. For a fixed upload limit, use the 25MB target-size compressor instead.
How browser processing works
Compression runs locally in the browser using FFmpeg WebAssembly. Your file is read from your device, processed inside the page, and offered back as a download.
Supported formats and output
- Input
- MP4, MOV, WebM, and other video files your browser and FFmpeg can read.
- Output
- MP4 intended for broad playback compatibility.
Practical examples
Classroom upload
Reduce a lesson recording to a smaller MP4 before uploading it to a learning platform.
Website preview
Resize and compress a product clip so it loads more comfortably on a web page.
Quality considerations
- Lower CRF values usually preserve more quality and create larger files.
- Screen recordings with small text need more detail than simple talking-head videos.
Limitations
- Compression always trades file size against quality.
- Large videos can fail if the browser tab runs out of memory.
- Some uncommon codecs may not preview or encode correctly in every browser.
Frequently asked questions
Which video format is exported?
The default output is MP4 with H.264 video and AAC audio for broad compatibility.
Does compression reduce quality?
Yes, smaller files normally trade off some quality. Use a lower CRF value if you want better quality and a larger file.
Troubleshooting
The compressed video is not much smaller.
The source may already be highly compressed. Try lowering width, trimming duration, or choosing a stronger quality setting.
The browser becomes slow.
Close other heavy tabs, try a shorter clip, or use a desktop browser with more available memory.