Reduce video file size with browser-based H.264 compression. No upload, no login, no credits.
Drop a file or click to choose
MP4 · MOV · WebM · AVI supported
🔒 Your file is processed in your browser. It is not uploaded to any server for this tool.
Upload your MP4 or MOV video
Choose a compression preset (Recommended, Smaller File, High Quality)
Download the compressed MP4 — free, no login
Instant — No Install
Works directly in your browser. No app download needed.
Private & Secure
Your video never leaves your device for free tools.
No Login Required
Just upload and start editing. No account needed.
No Watermark
Export clean videos without any CutKarlo branding.
Is Compress Video really free?
Yes — compression runs entirely in your browser using FFmpeg.wasm. No server upload, no login, no credits.
What formats are supported?
MP4, MOV, WebM, and AVI as input. Output is always MP4.
Can I control the compression quality?
Yes — choose Recommended, Smaller File, or High Quality presets, or use Custom mode to set CRF, resolution, audio bitrate, and FPS.
What if the compressed file is larger than the original?
This can happen when the source is already highly compressed. Try the Smaller File preset or reduce the resolution to 720p.
Free, no login, runs in your browser. Just upload and start.
No login · No watermark · No upload to server