Motion-aware judgment
Scrub moving sections; a static poster frame can hide compression damage.
Free Tool
Video Compressor
Reduce video file size with four quality presets. All compression happens in your browser via browser-native codecs — no upload, no account, completely private.
Watch the workflow
Reduce video file size with four quality presets — all compression runs in your browser
Compression quality
Balanced size/quality
Drop a video file or click to upload
MP4 · WebM · MOV — compressed in a background worker
How it works
The compressor re-encodes your video using your browser's built-in VP9 codec at a lower target bitrate. The video plays through in real time during processing — one minute of video takes about one minute to compress.
High — 4 Mbps target. Minimal quality loss, ~20–30% size reduction.
Medium — 1.5 Mbps target. Good balance, ~50% size reduction.
Low — 600 Kbps target. Noticeable compression, ~75% size reduction.
Very Low — 200 Kbps target. Maximum reduction, suitable for previews and thumbnails.
Frequently asked questions
How much will it reduce my file size?
High quality typically reduces size by 20–40% with minimal visible loss. Medium achieves 40–60%. Low and Very Low go further but with noticeable quality degradation at normal viewing sizes.
Why does it take as long as my video?
The browser plays your video in real time while encoding each frame. There is no faster path without native FFmpeg. A 2-minute video takes approximately 2 minutes to compress.
What format is the output?
Output is WebM (VP9). To convert to MP4, use the Video Format Converter tool after compressing.
Can I compress video that is already compressed?
Yes, but each re-encode introduces a small additional quality loss. For best results, compress once from the highest quality source you have.
Does it upload my video?
No. All compression runs locally in your browser. Your video never leaves your device.
Bitrate budget
Trade file size for visible quality with a real preview
Quality presets lower the bitrate and measure the resulting file so you can stop before motion detail becomes unacceptable.
Bytes / second
Compression lever
Measured result
Compare source and output sizes after the browser finishes encoding.
Continue editing
Open the compressed clip in the Video Editor without downloading and uploading again.
Know before you process: Very low bitrates produce blocking in fast motion, gradients, and low-light footage before simple scenes look damaged.
Ready to try it?
Free, private, no signup.
Compress a video →