Video Compress Tool
Upload a video, pick a High/Medium/Low quality preset for both video and audio (or type custom bitrates in kbps to override either one), and export a smaller MP4 or WebM file. See the original and compressed file sizes side by side so you can confirm the reduction before downloading. Useful for fitting under an upload size limit, speeding up sharing over a slow connection, or just trimming storage use. Everything runs on-device using the browser's native WebCodecs API, no upload involved.
Reviewed by Vincenzo Manto, Founder & Lead Developer · Last updated October 11, 2026
How it works
- 1
Upload a video file and let it load in the player, and see its original size.
- 2
Pick a quality preset (High, Medium, or Low), or type a custom bitrate in kbps for video and/or audio.
- 3
Pick MP4 or WebM.
- 4
Export: the tool re-encodes the file at the lower bitrate and shows you the new, smaller file size.
Real encoding, no plugins or uploads needed
Rather than relying on a heavyweight WebAssembly build of FFmpeg, this tool uses the browser's own native WebCodecs API to read your video, re-encode it at a lower bitrate, and mux the result back together without ever sending your video to a server.
Presets for convenience, bitrates for precision
Most people just want 'smaller, still watchable', which is what the three presets are for. If you have a specific target (say, 1500kbps to clear a platform's upload cap), the custom bitrate fields for video and audio let you dial in that exact number instead of guessing which preset gets you there.
Frequently asked questions
What's the difference between the quality presets and a custom bitrate?
The quality presets pick a sensible bitrate automatically based on general-purpose encoding settings. Setting a custom bitrate in kbps for video or audio overrides that preset for that specific stream, giving you exact control if you know a target number (for example, to fit a strict upload size limit).
Does compression happen on a server?
No. Reading the file, re-encoding at a lower bitrate, and producing the output all happen entirely client-side in your browser tab using WebCodecs, so the video is never uploaded anywhere.
How much smaller will my file get?
It depends heavily on the source file's existing bitrate and codec. The tool shows you both the original and compressed file sizes after export so you can see the actual reduction rather than relying on an estimate.
Will lowering the bitrate make the video look worse?
Yes, to some degree; that's the fundamental trade-off of video compression. The Low preset or a very low custom bitrate will introduce more visible artifacts than High or a generous custom bitrate, especially in fast-motion or highly detailed scenes.
What if my browser doesn't support MP4 or WebM encoding?
The tool checks what your browser can actually encode before you export and only offers the formats that will work. Try a recent version of Chrome, Edge, Firefox, or Safari if neither is available.
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