Video Compressor
Compress MP4 and WebM videos online directly in your browser. Video compression optimizes encoding bitrates to significantly reduce file size without sacrificing smooth playback or audio.
Ideal for website video embeds, email attachments, Discord, and social media sharing. Supports MP4, WebM, and MOV formats with custom presets and private client-side processing—zero video files are uploaded to any server.
Drag & drop your video here
or choose a file from your computer or phone
How to Compress Video in Your Browser
Compress MP4 and WebM videos for website embedding, Discord, Slack, and email attachments without sending files to remote servers.
Select Video File
Drag & drop any MP4, WebM, or MOV video into the upload box. The video loads directly into local browser memory with zero server uploads.
Pick Compression Preset
Choose Balanced (recommended for 40%–60% reduction), Smallest File (for maximum savings), or High Quality (for subtle re-encoding).
Re-encode in Browser
Click Compress Video. The browser decodes video frames and re-encodes them through native canvas and MediaRecorder APIs with live progress.
Download Optimized Video
Preview the resulting clip, review byte savings, and download your lightweight video file with zero watermarks or account signups.
Understanding Client-Side Video Compression
How MediaVexa optimizes video file sizes without transmitting personal media over the internet.
How Browser Video Compression Works
Video files captured on smartphones or digital cameras are typically encoded at high bitrates (10 to 50 Mbps) to preserve editing flexibility. When publishing to websites, sharing on messaging apps, or embedding in presentations, this bitrate wastes bandwidth without noticeable visual benefit. MediaVexa utilizes the browser's hardware-accelerated HTML5 Canvas and MediaRecorder APIs to re-encode the video stream at an optimized bitrate while keeping audio channels synced.
Bitrate vs. Resolution in Video
Video file size is directly governed by bitrate (megabits per second) multiplied by duration. A 1080p video recorded at 20 Mbps produces roughly 150 MB per minute. By re-encoding at a balanced 2 Mbps, the same 1080p video weighs approximately 15 MB per minute—a 90% reduction—with crisp lines and smooth motion for web viewers.
MP4 and WebM Formats for Web Publishing
Selecting the right video container ensures cross-platform compatibility:
Universal playback across every desktop browser, mobile phone, tablet, and smart TV.
Open-source web video container delivering efficient compression on modern browsers with high visual fidelity.
Need to Adjust Video Dimensions?
If your video resolution exceeds what your website layout or social feed requires, visit our Video Resizer to downscale to 1080p, 720p, or 480p before sharing.
Frequently Asked Questions
Answers to common questions about browser video compression, supported formats, and privacy.
More MediaVexa Utilities
Compress JPG, PNG, and WebP images with live side-by-side preview.
Scale image pixel dimensions while locking aspect ratio.
Convert between JPG, PNG, and modern WebP formats.
Scale video frame resolutions to 1080p, 720p, or 480p.