Is the online video compressor free?

Yes, completely free with no registration. All video compression happens locally in your browser — video files are never uploaded to any server.

What video formats are supported?

Supports common browser-playable formats: MP4, WebM, MOV, AVI, etc. Output format is WebM (VP9 codec), compatible with all modern browsers.

How effective is the compression?

Compression effectiveness depends on the original video and parameter settings. By reducing resolution, bitrate, and frame rate, you can typically reduce video size by 50%-90%. Adjust parameters based on your needs.

What size video files can I process?

Depends on browser memory, generally up to 500MB. Very large files may cause browser memory issues. Close other tabs to free memory before processing.

Will quality decrease after compression?

Video compression is inherently lossy — reducing bitrate will decrease quality. Adjust parameters to find the balance between file size and quality. Try default settings first, then fine-tune.

Online Video Compressor

Adjust resolution, bitrate, frame rate — compress locally in browser

Zero Dependencies · No Upload

中文

Home › Media Tools › Video Compressor

🎬 Video Compressor

📁

Click to select a video file or drag and drop
Supports MP4, WebM, MOV, AVI

Filename-

Original Size-

Resolution-

Duration-

Resolution Original

Video Bitrate 2 Mbps

Frame Rate 30 fps

Compressed Size-

Reduction-

🔒 Video files processed locally in your browser only, never uploaded to any server

What Can the Video Compressor Do?

The online video compressor is a free browser-based tool that lets you compress videos locally without uploading to any server. By adjusting resolution, bitrate, and frame rate, you can effectively reduce video file size while maintaining acceptable quality.

Core Features

Resolution Adjustment: Original, 50%, 75%, 720p, 480p, 360p
Bitrate Control: 500Kbps-8Mbps adjustable for precise compression
Frame Rate: Original, 30fps, 24fps, 15fps, 10fps
Preview: Preview original video before compressing
Compression Stats: Shows before/after size and reduction percentage

How to Use

Click to select or drag a video file to the upload area
Review video info and preview
Adjust compression parameters (resolution, bitrate, frame rate)
Click "Start Compress"
Wait for completion, then download the compressed video

Use Cases

Social Media Sharing

Compress large videos to meet social platform size limits like WeChat's 25MB or email attachment limits.

Web Video Optimization

Web developers compress videos to reduce page load times, improving user experience and SEO rankings.

Storage Savings

Compress rarely-used large video files to save disk space while keeping watchable quality.

Extended Knowledge

Video compression works by removing redundant information. Spatial redundancy (similar adjacent pixels within a frame) is compressed through intra-frame coding, while temporal redundancy (similar content across adjacent frames) is compressed through inter-frame prediction. Bitrate determines the data encoded per second — lower bitrate means smaller files but lower quality. Resolution affects detail level, and reducing it is the most effective compression method. Frame rate affects smoothness — 24fps is the cinema standard, 30fps is the video standard. This tool uses the browser's MediaRecorder API for encoding, outputting WebM format (VP9 codec) compatible with all modern browsers.

FAQ

What format is the output?

Output is WebM (VP9 video + Opus audio), the best format natively supported by browsers. All modern browsers and most players support WebM playback.

Compression is slow, what can I do?

Speed depends on video length and computer performance. Tips: 1) Lower resolution for faster processing; 2) Close other tabs to free resources; 3) Use Chrome (best encoding performance).

Compression failed, what should I do?

Possible causes: 1) Video format not supported by browser; 2) File too large for memory; 3) Browser doesn't support MediaRecorder. Use Chrome and try smaller files.