How does video compression work?

This tool uses FFmpeg.wasm to re-encode your video using H.264 with a higher CRF (Constant Rate Factor) value. A higher CRF value means more compression and smaller file size, at the cost of some quality. The default setting (Medium) provides a good balance for most videos.

Is my video uploaded to a server?

No. Video compression is processed with total confidentiality on your device and never sent to any server.

How much can I reduce a video file size?

Compression results vary by video content. Typically you can expect 30–70% reduction. Videos with lots of static scenes compress more than fast-moving action content.

Will compression reduce video quality?

Some quality loss is inevitable with compression. The Low compression setting preserves near-original quality. Medium provides good balance. High compression reduces quality more noticeably but achieves the smallest file size.

Compress Video Online for Free

Reduce video file size without sacrificing quality — lightning-fast H.264 compression, 100% free & unlimited.

100% Free & Secure Guarantee

Lightning-fast processing with zero waiting queues
Ultra-high audio & video fidelity up to studio quality (320 kbps)
100% free forever — no registration or credit card needed
Bank-grade privacy — your media remains completely confidential

Supported Formats

Input Formats

MP4MOVWebMAVI

Output Format

✓ MP4

Frequently Asked Questions

: This tool uses FFmpeg.wasm to re-encode your video using H.264 with a higher CRF (Constant Rate Factor) value. A higher CRF value means more compression and smaller file size, at the cost of some quality. The default setting (Medium) provides a good balance for most videos.

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