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.
Runs on your device. This tool processes your file inside this browser tab. Nothing is uploaded, so it also works offline once the page has loaded, and closing the tab discards the file from memory.
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 2026-08-12
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.