offlinewebtools.com — free, watermark-free browser tools that stay on your device with nothing uploading to our servers

Video Compressor

Reduce video file size while maintaining quality using advanced H.264 compression with customizable settings.

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Source file

Files are processed locally in your browser using WebAssembly.

Saved FFmpeg presets (stored locally)

Saved presets

Preset name

Quality (CRF)

Lower = better quality (0-51, default: 28)

Encoding Speed

Constant Rate Factor controls quality. Lower values (18-23) = better quality, larger files. Higher values (28-35) = smaller files, lower quality.

Typically 50-80% size reduction with minimal quality loss using CRF 28. Higher CRF values compress more but reduce quality.

Presets balance encoding speed vs compression efficiency. Slower presets create smaller files at the same quality but take longer to process.

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.