Video Compressor

Choose a setting for your delivery goal

1. Select one source file. Read its reported dimensions, duration and codec; a recognised extension does not guarantee browser decoding support.
2. Start with Balanced if you are exploring a smaller copy. Use Fit a maximum file size when you have a specific byte budget, or compare High quality when detail matters more.
3. Select a lower resolution only if the intended viewing use can tolerate it. Remove sound only when the clip does not need it.
4. Compress, read the result, preview picture and sound, then download and test the saved copy in its destination.

The available controls are quality mode, target size, resolution and sound. This page does not provide trimming, a frame-rate selector or dedicated app presets. Prepare a shorter clip in a separate editor if that is the right compromise.

What the quality modes can change

Balanced, Smaller file and High quality request different video bitrates based on dimensions and the source’s estimated frame rate. They are starting points, not measured quality scores. Already compact sources may shrink little or even produce a larger result. Keep whichever copy best meets your purpose.

Auto keeps the source dimensions in quality modes; in target-size mode it can reduce them when the budget is tight. Resizing preserves the intended aspect ratio subject to pixel rounding. Smaller dimensions remove detail, so compare tutorial text, faces and fast-moving scenes before accepting a result.

Check the finished size before sending

For illustration, a 25 MB file over 120 seconds has a total average budget of about 1.667 Mbps before overhead. Audio consumes part of that budget. This tool reserves initial container headroom and can retry up to twice if output overshoots; it can still report Target not met. Always read the final byte count.

Use the destination’s current size and codec requirements. No fixed preset here guarantees acceptance by an email provider, chat app or upload form. See the size-budget guide for arithmetic and examples.

Check the copy before relying on it

• Compare readable text, movement and dark or detailed scenes at the intended viewing size.
• Listen to the beginning, middle and end; check synchronisation and whether necessary sound remains.
• Check duration, orientation and colour. Do not assume HDR or every metadata field is preserved.
• Test the downloaded MP4 on the recipient device or application. The page preview alone cannot establish compatibility.

The tool re-encodes primary video and audio. It is not a lossless archive, a full editing suite or a certified metadata scrubber. Extra tracks and subtitles should not be assumed to survive. Keep the original separately; see the quality comparison guide and playback troubleshooting.

Processing, device limits and privacy

The compressor reads the selected file and creates the output locally in your browser; its video-processing module has no file-upload request. Loading the website and any shared services can still involve network requests. Local video processing does not mean that the entire website collects no request, analytics or advertising information.

One file is processed at a time. The input ceiling is 2 GiB (2,147,483,648 bytes, about 2.15 decimal GB). That is a validation limit, not a guarantee the device has enough memory: the output is buffered in memory. Save the result before leaving or reloading the page.

Speed depends on source complexity, encoder availability and device resources. There is no fixed completion time. Keep the tab visible and follow the displayed error if processing stops. Browser and OS support determine the available codecs; an up-to-date browser does not guarantee every file can be read or encoded.