Online Video Compressor: Free Video Compressor for Large Files with Preview

In-browser video compression

This tool compresses videos directly in the browser, with no desktop installation required.

You can process multiple files in one queue and keep track of progress file by file. Videos larger than 512 MB use streamed local processing and are not sent to the site server.

Compression control with expected final size

The compression slider lets you choose lighter or stronger reduction depending on your quality target.

Before processing, the tool shows an estimated output size based on duration and target profile to help you decide quickly.

• Lower compression for better quality retention.
• Medium compression for day-to-day uploads.
• Higher compression for stricter file-size limits.
• Batch queue for handling several videos at once.

Privacy and performance notes

Videos over 512 MB stay on your device and are compressed in a browser worker, with temporary output written to local storage. Smaller files may use the site processing API when it is available.

Large, high-resolution videos can take a long time. Mobile browsers may pause work when you switch apps or lock your phone, so keep this page open and connect the device to power when possible.

The tool streams media data instead of splitting the video into separately compressed clips, which avoids introducing cut points or audio synchronization gaps when joining segments.