Reduce file size without uploading the video
The browser reads the video, applies the selected quality, resolution, frame rate and audio setting, then produces a broadly playable MP4. Video contents are not sent to Zituo Tools.
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Compress video in your browser
Online Video Compressor
Reduce video file size locally in your browser. Your video is not uploaded to our server, helping keep its contents private.
Your video stays on this deviceDrop a video here
Supports common formats such as MP4, MOV, WebM and MKV, up to 2 GB.
Selected video
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Original file—
Estimated output—
Analyzing video
0%
All processing runs locally in this browser. The video is not uploaded.
Compression complete
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Choose a video, adjust settings, encode locally and download
Add a video, review its dimensions, duration and estimated output, then choose Balanced or Smaller file and start. Local progress appears on the page and the result can be downloaded when finished; closing or refreshing ends the task.
Method and sources
Mediabunny parses the input container, coordinates tracks and muxes MP4, while WebCodecs uses the browser's video decoder and encoder. Target bitrate is derived from dimensions, frame rate and mode; the output is created as an in-memory Blob for download.
Referenced projectsWebCodecs APIMediabunny 1.51.0
Frequently asked questions
What can Online Video Compressor do?
The browser reads the video, applies the selected quality, resolution, frame rate and audio setting, then produces a broadly playable MP4. Video contents are not sent to Zituo Tools.
How do I use Online Video Compressor?
Add a video, review its dimensions, duration and estimated output, then choose Balanced or Smaller file and start. Local progress appears on the page and the result can be downloaded when finished; closing or refreshing ends the task.
Does Online Video Compressor upload my data?
The selected video is read, decoded, encoded and muxed on this device using Blob, WebCodecs and Mediabunny. Video bytes are not uploaded to Zituo Tools. The page may still load the access analytics disclosed on the privacy page.