Video Compressor
Compress video files to reduce size. Adjustable quality, resolution, and audio bitrate. Runs locally in your browser.
Free Video Compressor — Reduce Video File Size Online
This tool compresses video files directly in your browser. Choose a compression preset, resolution, and audio bitrate, then download the smaller file. No software to install, no server uploads, and no watermarks.
Compression uses H.264 encoding with configurable CRF (Constant Rate Factor) values. Lower CRF means higher quality and larger files. Higher CRF means more compression and smaller files.
Features
- Three compression levels — Light (high quality), Medium (balanced), and Heavy (maximum compression).
- Resolution downscaling — keep original resolution or downscale to 720p, 480p, or 360p.
- Audio bitrate control — choose 128k, 96k, or 64k audio bitrate.
- Before/after comparison — see original and compressed file sizes with compression percentage.
- Local processing — your video never leaves your device.
How to Compress a Video
- Click the upload area or drag a video file into it.
- Select a compression preset: Light, Medium, or Heavy.
- Optionally change the resolution and audio bitrate.
- Click Compress Video. The first use downloads the video processor (~31MB, cached afterwards).
- Compare file sizes and download the compressed video.
Privacy
Your video is processed entirely in your browser using WebAssembly. No video data or metadata is sent to any server. The compressed file exists only in your browser memory until you download it or close the page.
Related Tools
- Video Trimmer — cut and trim video clips in your browser.
- Video Format Converter — convert between video formats.
- Video to MP3 Converter — extract audio from video files.
Frequently Asked Questions
Is this tool free?
Yes. It is completely free with no file size limits and no signup required.
Does my video get uploaded?
No. Your video stays on your device. All compression happens locally in your browser.
What output format is used?
Compressed videos are output as MP4 (H.264 + AAC) for maximum compatibility across devices and platforms.
How much will my video be compressed?
It depends on the source. Light compression typically saves 30-50%. Medium saves 50-70%. Heavy saves 70-85%. Results vary based on original encoding and content.
Will compression reduce video quality?
Some quality loss is inherent in compression. Light compression is nearly indistinguishable from the original. Medium is suitable for most purposes. Heavy is best when file size matters more than quality.
Why is compression slow?
Video encoding is CPU-intensive. WebAssembly runs at near-native speed but re-encoding a full video takes time. Shorter videos and lower resolutions compress faster.