Dev & Data ToolboxLoading Video Compressor...
Free Online Video Compressor
Compress your video files to reduce size while maintaining quality with our powerful browser-based video compressor. Perfect for reducing file sizes for email attachments, web uploads, social media, and cloud storage. All processing happens entirely in your browser using FFmpeg.wasm - your videos never leave your device.
How to Compress Videos in 3 Easy Steps
Upload Video
Drag and drop your video file or click to browse. Supports MP4, MOV, WebM, AVI, and MKV formats.
Choose Quality
Select from High (1080p), Medium (720p), or Low (480p) quality presets based on your needs.
Download Result
Click compress, wait for processing, and download your optimized video with size reduction stats.
Key Features
Frequently Asked Questions
Is my video data safe?
Yes, 100% safe. All video compression happens entirely in your browser using FFmpeg.wasm. Your video files are never uploaded to any server, ensuring complete privacy and security.
What video formats are supported?
We support all major video formats including MP4, MOV, WebM, AVI, and MKV. The output is always in MP4 format with H.264 video codec for maximum compatibility across devices and platforms.
How much can I reduce the file size?
File size reduction varies depending on the original video and selected quality preset. Typically, you can expect 40-70% reduction with Medium quality, and up to 80% with Low quality while maintaining acceptable visual quality.
What's the difference between quality presets?
High Quality (1080p): Best for professional use, larger file size.Medium Quality (720p): Balanced quality and size, perfect for most uses.Low Quality (480p): Smallest file size, suitable for email attachments and quick sharing.
How long does compression take?
Compression time depends on your device's processing power and video length. A 1-minute video typically takes 30-60 seconds. Longer videos may take several minutes. You'll see real-time progress updates during compression.
Is there a file size limit?
There's no hard limit, but very large files (>500MB) may take a long time to process and could cause performance issues depending on your device's available memory. For best results, we recommend files under 500MB.
Will compression reduce video quality?
Some quality loss is inevitable with compression, but our tool uses advanced H.264 encoding to minimize visible quality degradation. The High Quality preset maintains excellent visual quality, while Medium and Low presets offer good quality for most viewing scenarios.
Can I use this on mobile devices?
Yes, the tool works on modern mobile browsers, though compression may be slower on mobile devices due to limited processing power. For best performance, we recommend using a desktop or laptop computer.
Technical Information
Compression Technology
- Engine: FFmpeg.wasm (WebAssembly port of FFmpeg)
- Video Codec: H.264 (libx264) for maximum compatibility
- Audio Codec: AAC for high-quality audio
- Compression Method: CRF (Constant Rate Factor) based encoding
- Processing: 100% client-side using Web Workers
Browser Compatibility
- ✅ Chrome 90+ (recommended)
- ✅ Firefox 88+
- ✅ Safari 15.4+
- ✅ Edge 90+
- ⚠️ Requires JavaScript enabled
- ⚠️ Works best on desktop/laptop computers
Privacy & Security
No Server Uploads: Your videos are processed entirely in your browser using FFmpeg.wasm
Complete Privacy: No data collection, no tracking, no analytics on your video files
No Registration Required: Use the tool immediately without creating an account
Open Source Technology: Built with FFmpeg.wasm, a trusted open-source project