Compress Video
Reduce a video's file size with adjustable compression levels, right in your browser.
Videos straight from a phone or camera are often far larger than needed for sharing over email, messaging apps, or upload forms with strict size limits, and re-encoding at a more efficient setting can shrink a file dramatically with minimal visible quality loss.
This tool re-encodes your video using the H.264 codec (the most widely compatible video format) at an adjustable compression level — from high-quality/larger-file to more aggressively compressed/smaller-file — using a genuine ffmpeg engine running entirely in your browser via WebAssembly, the same underlying technology used by professional video conversion software.
Because encoding happens on your device's own processor rather than a remote server, there's no upload wait and your video is never transmitted anywhere — though this also means processing time depends on your device's performance and the video's length and resolution, with a live progress bar throughout.
How to use Compress Video
- 1
Upload your video
Drop the video file you want to compress into the upload area.
- 2
Choose a compression level
Pick balanced, high-quality, or maximum-compression depending on your priority.
- 3
Click Compress & Download
Watch the live progress bar, then download your compressed video.
Features
- Real H.264 video encoding via ffmpeg running in your browser
- Three compression presets for different quality/size tradeoffs
- Shows exact before/after file size comparison
- No file upload — processed entirely on your device
Frequently asked questions
Common mistakes to avoid
- Choosing maximum compression for content with a lot of motion or detail, which shows compression artifacts more readily than static scenes.
- Closing the browser tab mid-compression, which stops processing before it completes.
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