MP4 to WebM Converter
Convert MP4 videos to WebM format for better web compatibility. Uses VP9 codec for high quality at smaller file sizes. Free online video converter.
How to Convert MP4 to WebM
- 1 Click to upload your MP4 video file
- 2 Select the output quality setting
- 3 Click Convert to WebM to start the conversion
- 4 Wait for the processing to complete
- 5 Download your WebM file for web use
Frequently Asked Questions
How does browser-based video processing work? ▼
MagicKit uses FFmpeg compiled to WebAssembly (WASM). This brings professional video editing capabilities directly to your browser.
What video formats are supported? ▼
MP4, WebM, MOV, and AVI. Some tools also support MKV and other formats.
Is there a file size limit for videos? ▼
We recommend files under 500MB for optimal browser performance. Larger files will work but may be slower.
Why does video processing take time? ▼
Video encoding is computationally intensive. Processing happens on your device, so speed depends on your computer's capabilities.
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Last updated: January 15, 2026 · v2.1