Free Video Compressor — Reduce File Size Online
Compress videos with H.264 encoding right in your browser — a free alternative to HandBrake. No sign-up, no uploads.
Quality Presets
Choose Small File, Balanced, or High Quality — or set a custom CRF value for precise control over the quality/size trade-off.
Resolution Control
Optionally downscale to 1080p, 720p, 480p, or 360p while maintaining aspect ratio. Great for cutting file size further.
H.264 + AAC Output
Output is MP4 with H.264 video and AAC audio — the most universally compatible format for web, mobile, and social media.
100% Private
All processing happens in your browser using WebAssembly. Your video never leaves your device — no uploads, no servers.
Free Video Compressor — Reduce Video Size Online
The Free Video Compressor lets you reduce video file size directly in your browser using H.264 (libx264) encoding via WebAssembly. Choose a quality preset or fine-tune with custom CRF and resolution settings. Your video never leaves your device — no uploads, no sign-up, no file size limits.
Features
- Quality presets — Small File, Balanced, High Quality, or Custom. Each preset configures CRF and resolution for the best results.
- CRF control — Fine-tune the quality/size trade-off with a slider from 0 (lossless) to 51 (maximum compression).
- Resolution downscaling — Reduce from 4K to 1080p, 720p, 480p, or 360p while maintaining aspect ratio.
- Audio passthrough — Copy the audio stream without re-encoding for faster processing, or re-encode to AAC 128k.
- MP4 output — H.264 + AAC with faststart flag for instant web playback. Compatible with every device and platform.
- 100% client-side — Uses ffmpeg.wasm (WebAssembly). Your video never leaves your device.
How to Compress a Video
- 1. Add a video — Drag and drop a video file or click to browse. Supports MP4, WebM, MOV, AVI, MKV.
- 2. Choose a preset — Select Small File for maximum compression, Balanced for a good trade-off, or High Quality for minimal loss.
- 3. Adjust settings — Optionally tweak CRF, resolution, and audio settings for precise control.
- 4. Compress — Click Compress and wait. The progress bar shows real-time status. Video encoding is CPU-intensive and may take a few minutes.
- 5. Download — When complete, see the before/after file size and click Download.
Video Compressor Comparison
| Feature | Free Tool Shed | HandBrake | Online Tools |
|---|---|---|---|
| Price | Free | Free | Free (limited) or $5-15/mo |
| Installation | None (browser) | Desktop app install | None |
| Privacy | Local processing only | Local processing | Files uploaded to server |
| Speed | Slower (single-thread WASM) | Fast (native, multi-thread) | Varies (server-side) |
| File size limit | ~500 MB-1 GB (browser RAM) | No limit | 25-500 MB typically |
| Sign-up required | No | No | Usually yes |
Frequently Asked Questions
When should I use this vs. HandBrake?
Use this tool for quick, one-off compressions when you don't want to install software — especially on Chromebooks or work machines. Use HandBrake for long videos, batch processing, or when you need maximum encoding speed.
What CRF should I use?
CRF 18-20 is visually lossless for most content. CRF 23-26 is a good balance of quality and size. CRF 28-32 produces noticeably softer video but much smaller files — fine for low-motion content like presentations or screen recordings.
Can I compress a 4K video to 1080p?
Yes. Set the Max Resolution to 1080p and the video will be downscaled while maintaining aspect ratio. Combined with CRF compression, this can reduce a 4K video to 10-20% of its original size.