Video Compressor
Shrink video file size with H.264 re-encoding, entirely in your browser via ffmpeg.wasm.
Uploading a video to email, a CMS, or a chat app often means fighting a file size limit. This tool re-encodes your video with H.264 using FFmpeg compiled to WebAssembly, running the entire compression pass locally in your browser with no upload to a server. A Balanced preset typically shrinks files 40-70% depending on the source, trading some bitrate for size without a dramatic visible quality drop - useful ahead of the Social Media Video Toolkit if a clip is still too heavy for a platform's limits.
Loading tool
How it works
- 01
Drop or select the video you want to shrink.
- 02
Choose a compression preset (or custom bitrate).
- 03
Click Compress and download the smaller file.
Details
- Category
- Video
- Runs
- In your browser
- Files uploaded
- No
- Cost per run
- Free
- Sign-in
- Not required
- Works offline
- Yes, once loaded
Last updated 2026-08-03
Common questions
How much smaller will my video get?
Depends on the source, but 40-70% smaller is typical at the Balanced preset.
Does it upload my video?
No - compression runs locally with WebAssembly. Nothing leaves your browser.
Will compression noticeably hurt quality?
At the Balanced preset, most viewers won't notice a difference at normal viewing sizes. More aggressive presets trade more quality for smaller files.
Does it also resize the video?
No - resolution stays the same. Use the Video Resizer alongside compression if the file also needs smaller dimensions.