Video Compressor Online

The browser may not natively decode that container or codec. If the file signature is recognized, you can still try compression. For the most predictable preview and output workflow, MP4/H.264 sources are widely supported.

Cancel if possible, then try a shorter trim range, smaller resolution, lower frame rate or another device with more memory. Browser-side encoding can consume substantial RAM for long or high-resolution videos.

Already-efficient sources can resist further reduction. Try Strong or Extreme, reduce resolution, lower frame rate, lower audio bitrate, mute audio, or choose a higher Custom strength.

Container overhead and variable video complexity make exact one-pass sizing difficult. The tool can automatically make one corrective bitrate pass when the first result is clearly over target, but the final value is still approximate.

Check your connection, content blocker, private browsing restrictions or network policy, then retry. The fast media toolkit is loaded only after you start compression. The heavier compatibility encoder is loaded only when the browser-native path cannot process the source.

Confirm Audio is not set to Mute video. Some unusual source audio codecs or malformed tracks may fail to decode; in that case try a different source container or re-export the original video first.

The file picker accepts common containers including MP4, MOV, M4V, MKV, WebM, AVI, 3GP, MPEG and related video formats. Actual decoding depends on the codec inside the file and what the browser processing engine supports.

Yes. Select an MP4, choose a compression level or target size, then download a newly encoded MP4. The page does not require a CorrectionCopy account and does not intentionally add a watermark to the output.

Start with Balanced or Light, keep the original resolution and frame rate, and avoid an unnecessarily small target size. All meaningful lossy video compression can change quality, so preview the result before downloading.

Yes. Enable target-size mode and enter the MB value you need. The tool calculates an approximate bitrate from the selected duration and audio settings, then may run one corrective pass when the first result is clearly above target.

Yes. Screen recordings, MP4 camera clips and supported MOV phone videos can be compressed. For screen recordings with small text, preserve resolution first and reduce bitrate or trim duration before aggressively resizing.

The output is MP4 with H.264 video and AAC audio when audio is kept. This combination is chosen for broad playback and sharing compatibility.

You can enable target-size mode and enter a desired size in MB. The tool estimates a suitable video bitrate from duration and audio settings. Final size is approximate rather than mathematically guaranteed.

Balanced is a sensible starting point. Use Light when preserving detail matters more, Strong when file size matters more, Extreme for aggressive reduction, or Custom when you want direct compression-strength control.

Usually yes. Re-encoding with lower bitrate, lower resolution or lower frame rate removes information. Good settings aim to make that loss hard to notice for the intended use rather than pretending there is zero quality change.

This page does not impose an arbitrary local file-size limit. Your browser and device determine practical capacity. Large 4K or long videos can exceed available memory even when smaller videos work normally.

Current mobile browsers can run the tool, but browser memory and background-tab restrictions are tighter on phones. Shorter clips and reduced resolution are more reliable for demanding jobs.

No desktop application is required. Compression runs locally in the browser. Supported sources use browser-native WebCodecs; a compatibility engine is used only when necessary. Keep the tab open until output validation finishes.

This page has no CorrectionCopy video-upload endpoint. Your selected video is processed locally. The fast media toolkit and, only when needed, the compatibility processing code are loaded from pinned external distribution URLs; the video itself is not uploaded to those providers.

A source that is already highly compressed can become larger after re-encoding with a high-quality setting. Try a stronger quality level, smaller resolution, lower frame rate or lower audio bitrate.

Yes. Choose Mute video in the Audio setting before compression. The downloaded MP4 will contain no audio track.

Yes. Enable Trim before compression, enter a start and end time, and only that segment will be encoded. Shortening duration is one of the most direct ways to reduce output size.