Is this video compressor free?

Yes, 100% free with no watermark, no file size limits, and no signup required.

Are my videos uploaded to a server?

No. All compression happens locally in your browser using FFmpeg WebAssembly. Your videos never leave your device.

How much can I reduce the file size?

Typically 50-90% reduction depending on the original video and quality settings. A 100MB video can often be compressed to 10-25MB.

What video formats are supported?

Input: MP4, WebM, AVI, MOV, MKV and most common video formats. Output: MP4 (H.264) or WebM (VP9).

Why does it take time to load?

The first time you use the tool, it downloads the FFmpeg engine (~31MB). This is cached in your browser so subsequent uses are instant.

Is there a file size limit?

The limit depends on your device memory. Most devices handle videos up to 500MB-1GB without issues.

Video Compressor Online

Compress videos to smaller file sizes directly in your browser. No uploads, no server, completely private. Reduce video size for email, Discord, WhatsApp, and social media sharing. Powered by FFmpeg WebAssembly.

Loading FFmpeg engine...

First load downloads ~31MB (cached for future use)

How Browser-Based Video Compression Works

This video compressor uses FFmpeg compiled to WebAssembly, which means the entire compression engine runs directly inside your browser. When you select a video file, it is read into your browser's memory and processed locally using the same FFmpeg codecs that professional video editors rely on. The compressed output is generated entirely on your device without any data being sent to external servers. This approach guarantees complete privacy for sensitive recordings, personal videos, and confidential business footage. The FFmpeg WASM engine supports H.264 encoding for MP4 output and VP9 for WebM, both of which offer excellent compression ratios while maintaining visual quality.

Choosing the Right Compression Settings

The target size presets make it easy to compress videos for specific platforms. Email services typically limit attachments to 10-25MB, Discord allows up to 25MB for free users, and WhatsApp caps videos at approximately 16MB. For the best balance between file size and quality, use the Medium quality setting with 720p resolution, which typically reduces file size by 60-80% while keeping the video watchable. The High quality setting uses a lower CRF value for less aggressive compression, preserving more detail in fast-motion scenes and complex textures. Lowering the resolution from 1080p to 720p or 480p is one of the most effective ways to reduce file size, often halving it with minimal perceptible quality loss on mobile screens.

Video Compression for Social Media and Messaging

Social media platforms and messaging apps compress uploaded videos automatically, often reducing quality significantly. By compressing your video beforehand with controlled settings, you can ensure the final result looks better than what the platform would produce on its own. For WhatsApp sharing, target 10-16MB at 480p for fast sending. For Discord, use the 25MB preset at 720p for the best quality within the free tier limit. For email attachments, the 10MB preset at 480p keeps videos small enough to send reliably through most email providers. The MP4 format with H.264 encoding is universally supported across all platforms and devices.

Privacy and Technical Details

Unlike cloud-based video compressors that upload your files to remote servers, this tool processes everything locally using WebAssembly. Your video never leaves your device, making it safe for compressing personal recordings, private business meetings, confidential presentations, and any content you want to keep private. The first time you use the tool, it downloads the FFmpeg WebAssembly engine (approximately 31MB), which is cached in your browser for instant use on subsequent visits. Processing speed depends on your device hardware: modern laptops and desktops typically compress a 5-minute 1080p video in 1-3 minutes, while mobile devices may take longer. There are no daily limits, no watermarks, and no signup requirements.