Convert Video Format
Convert videos between MP4, MKV, and AVI formats.
Upload your file
Drag & drop or click to select a file from your device.
Adjust settings
Configure options to get the result you want.
Download result
Get your processed file instantly. No waiting.
Key Features
Free Video Converter Online
Convert between MP4, WebM, MKV, AVI formats. No software download, no registration required.
H.264, H.265, VP9 Codecs
Choose codecs for compatibility or file size. H.264 for everywhere, H.265 for smaller files, VP9 for WebM.
Fast Stream Copy Conversion
MKV uses stream copy for instant conversion when possible. Same quality, new container, zero wait.
Audio & Video Stay Synced
Professional transcoding keeps audio perfectly aligned. No lip-sync issues in converted files.
Preview Converted Video First
Watch the result in browser before downloading. Confirm quality, then save to your device.
Convert Without Uploading
100% browser-based conversion. Your files never leave your computer. Private and secure.
About This Tool
What is Convert Video Format?
Convert Video Format transforms videos between popular formats: MP4, WebM, MKV, and AVI. Need to convert a WebM recording to MP4 for wider compatibility? Or an AVI to WebM for web use? This tool handles it.
Powered by FFmpeg.wasm for reliable format conversion in your browser.
Common Use Cases
- Compatibility: Convert WebM screen recordings to universally playable MP4
- Web Optimization: Convert videos to WebM for smaller file sizes on the web
- Legacy Support: Convert modern formats to AVI for older media players
- Editing: Convert to a format your video editor supports
- Cross-Platform: Ensure videos play on any device or platform
Privacy-First Video Conversion
Format conversion runs entirely in your browser using FFmpeg.wasm.
- Your videos never leave your device
- No server processing or cloud encoding
- Works offline after FFmpeg core is loaded