Compress Videos Online - Free & Private
Our free video compressor lets you reduce video file size directly in your browser without uploading files to any server. Compress MP4, MOV, and WebM videos while maintaining excellent quality. Perfect for sharing videos via email, uploading to social media, or reducing storage space. With advanced settings like adjustable quality (CRF), resolution control, trimming, and cropping, you have complete control over the compression process. All processing happens on your device using WebAssembly, ensuring your videos remain completely private and secure.
How to Compress a Video
- 1.Upload your video - Click "Choose Video" or drag and drop your MP4, MOV, or WebM file
- 2.Adjust settings - Set quality level (CRF), change resolution, trim unnecessary parts, or crop the video
- 3.Preview settings - Review the expected file size and duration before compressing
- 4.Compress - Click the "Compress Video" button and wait for processing to complete
- 5.Download - Save your compressed video file to your device
Why Use Browser-Based Video Compression?
- 100% Private: No files uploaded to servers
- Completely Free: No limits or subscriptions
- No Waiting: Process videos instantly in your browser
- Works Offline: No internet connection required after page load
- Advanced Features: Trim, crop, resize, and adjust quality
- Multiple Formats: Supports MP4, MOV, and WebM
Frequently Asked Questions
Is it safe to compress videos online?
Yes, completely safe. Unlike traditional online compressors, LocalSquash processes your videos entirely in your browser using WebAssembly. Your files never leave your device, are never uploaded to any server, and remain completely private. No one else can access your videos.
How much can I reduce my video file size?
Typically, you can reduce video file size by 50-90% depending on your settings. Using a CRF value of 23-28 provides excellent quality while significantly reducing file size. Lowering the resolution (e.g., from 4K to 1080p) can reduce file size by 70% or more.
What video formats are supported?
We support MP4, MOV (QuickTime), and WebM formats. The output is always MP4 with H.264 encoding, which provides excellent compatibility across all devices and platforms.
What does CRF mean in video compression?
CRF (Constant Rate Factor) controls video quality. Lower values (18-23) produce higher quality and larger files, while higher values (28-35) produce smaller files with lower quality. We recommend CRF 23-26 for most use cases, offering a good balance between file size and visual quality.
Can I compress 4K videos?
Yes! You can compress 4K videos and optionally downscale them to 1080p or other resolutions for even greater file size reduction. Keep in mind that processing 4K videos requires more time and memory.
Is there a file size limit?
The only limit is your device's available memory. Since processing happens in your browser, very large files (over 2-4GB) may be slow or fail on devices with limited RAM. For best results, we recommend files under 2GB.
Will compressing reduce video quality?
Some quality loss is inevitable with compression, but with proper settings (CRF 23-26), the difference is barely noticeable to the human eye. You can preview the expected file size before compressing to find the right balance for your needs.
Video Compression Tips
- •Start with CRF 23-26 for a good balance between quality and file size
- •Reduce resolution if the video will be viewed on mobile devices or social media
- •Trim unnecessary footage at the beginning and end to reduce file size further
- •Use "veryfast" speed preset for quick compression, or "slower" for better quality at the same file size
- •Lower audio bitrate to 128k for most videos where audio quality is less critical