Compress Video — Reduce File Size Free Online
Shrink your video file size while preserving visual quality. Instantly. No sign-up required.
How to compress video
- 1Upload your video file using the drop zone above
- 2Select a compression level — low, medium, or high
- 3Click "Compress Video" to reduce the file size
- 4Compare the before and after sizes, then download
About This Tool
Large video files are difficult to share via email, upload to social media, or store on limited devices. Our free compress video tool uses H.264 encoding with adjustable CRF (Constant Rate Factor) values to dramatically reduce file size while keeping excellent visual quality.
Choose from three compression levels: low compression (CRF 18) for near-lossless quality, medium compression (CRF 28) for a great balance of size and quality, or high compression (CRF 35) for maximum size reduction. You will see the before and after file sizes immediately.
All processing runs in your browser via FFmpeg.wasm. Your video is never uploaded to any server, making it safe for confidential or personal footage. No watermarks, no limits, no account needed.
Frequently Asked Questions
The compression level controls the CRF (Constant Rate Factor) used by the H.264 encoder. Low compression (CRF 18) keeps nearly all visual detail. Medium (CRF 28) is a good balance — visually great with significant size savings. High (CRF 35) aggressively reduces size but may show some quality loss.
Results vary depending on the original file. Uncompressed or lightly compressed videos may see 50-90% reduction. Already compressed MP4 files may see 20-50% reduction at medium settings.
There is no hard limit. Processing happens in your browser, so performance depends on your device's memory and processing power. Most videos under 500 MB work well.
No. All compression happens locally in your browser using WebAssembly. Your video never leaves your device.
For sharing on social media or messaging, medium works great. For archival or professional use, choose low. For email attachments or very large files, high gives maximum reduction.