Reduce video file size securely in your browser. No server upload required.
Privacy Note: This tool uses WebAssembly. Your video is processed entirely on your device and is never uploaded to our servers.
Load your video, select a speed preset, and compress it locally in your browser before downloading the smaller result.
Video files are enormous. A single 2-minute phone video can be 200–400 MB. Uploading, sharing, or storing large videos is slow, expensive, and often blocked by file size limits. Our free online video compressor solves this problem directly in your web browser — using WebAssembly technology to run the industry-standard FFmpeg encoder without ever uploading your video to a server.
This means 100% privacy. Your video never leaves your device. The compression happens entirely on your computer using your own CPU and GPU. There is no risk of your personal or private video content being stored, analyzed, or shared. This is a key advantage over most online video compressors, which upload your file to a remote server for processing.
The compression uses the H.264 (libx264) video codec with a CRF (Constant Rate Factor) of 28, which is an excellent balance between quality and file size reduction. Audio is re-encoded to AAC at 128 kbps, which is transparent quality for most content. Depending on the original video's codec and bitrate, you can expect file size reductions of 40–70% with minimal visible quality loss.
Content creators compress videos before uploading to YouTube, Instagram Reels, or TikTok to speed up upload times. Students compress lecture recordings before submitting to university portals with size limits. Businesses reduce video file sizes before embedding in presentations or sending via email. Developers optimize video assets for web applications. Remote workers compress screen recordings before sharing via Slack or Teams. Whatever your use case, our browser-based compressor is the fastest and most private solution available online.