Compress video from GB to MB in your browser

Compress large videos to a target size in MB. Free in-browser video compressor powered by FFmpeg — no uploads, no accounts, files stay on your device.

VideoOptimize is a free online video compressor for people who need a smaller file — for email, messaging apps, course uploads, or limited storage — without sending the recording to a third-party cloud encoder.

What you can do

• Pick a target size in MB so the finished file fits a limit you already know.
• Encode locally with FFmpeg compiled to WebAssembly; the video file does not leave your device.
• Watch live progress while the browser compresses, then download an optimized MP4.

Who this is for

Students sharing lecture recordings, creators polishing clips on a laptop, support teams packaging screen capture, or anyone asked to “send a smaller video.” Beginners can set a size in MB; advanced users can choose codec and quality speed tradeoffs in the tool.

Supported formats

Common inputs include MP4, MOV, WebM, AVI, and MKV. Output is MP4 suitable for playback and sharing. Need details on privacy or codecs? Read the video compressor FAQ or how compression works.

Privacy-first by design

Unlike many online compressors, VideoOptimize does not require you to upload to a server. Encoding runs in the browser. See our privacy policy for analytics and cookies.

JavaScript is required to use the interactive compressor tool on this page.