Video Compressor
Shrink MP4, MOV and WebM videos by picking a quality preset, a target size in MB or a lower resolution — re-encoded in your browser, nothing uploaded.
How to Compress a Video in 3 Steps
Drop a Video
Drag an MP4, MOV or WebM onto the left pane. Duration, resolution and size show in the header, and the toolbar estimates the output size for the current settings.
Pick Quality or a Target Size
Choose Small, Balanced or High, or type a target size in MB and the tool works out the bitrate. Lower the resolution for the biggest savings on 4K phone footage.
Compress & Download
Click Compress. Encoding runs at playback speed — a 2-minute clip takes about 2 minutes. Preview the result, check the saving, then download.
Bitrate Cheat Sheet
| Use case | Resolution | Bitrate | 1 minute ≈ |
|---|---|---|---|
| WhatsApp / chat | 480p | 1 Mbps | 7.5 MB |
| Email attachment (under 25 MB) | 720p | Target 20 MB | up to 5 min |
| Web / blog embed | 720p | 2.5 Mbps | 19 MB |
| Social upload (Instagram, LinkedIn) | 1080p | 5 Mbps | 37 MB |
| Archive, keep quality | Original | 5 Mbps+ | 37 MB+ |
Video Compressor — Frequently Asked Questions
Why does compression take as long as the video?
The browser re-encodes by playing the video onto a canvas and recording it with the built-in MediaRecorder, which works in real time. It is the only way to compress video without uploading it or shipping a 30 MB encoder. Keep the tab in the foreground while it runs.
How accurate is the target size?
Within roughly ±10%. The bitrate is calculated from your target and the duration; encoders are variable-bitrate so the final file can land a little above or below. Set the target 10% under any hard limit.
Will I get an MP4 or a WebM?
MP4 (H.264) in Chrome, Edge and Safari; WebM (VP9) in Firefox and older browsers. Both play everywhere that matters — WhatsApp, iMessage, Slack, YouTube and all modern browsers.
Is the audio re-encoded too?
Yes, to Opus or AAC depending on the container. Choose "Keep · 64 kbps" for voice recordings, or "Remove" to strip audio entirely from screen recordings and B-roll.
Is my video uploaded anywhere?
No. Decoding, scaling and re-encoding all happen inside your browser with the Canvas, Web Audio and MediaRecorder APIs. Nothing is transmitted or stored.