Files never leave your device
Convert WebM to MKV Online — Free | AVMint
Convert WebM to MKV online for free. 100% browser-based — no upload, no sign-up, no watermark. Works on any device.
Need to convert WebM to MKV? AVMint converts your WebM files to MKV right in your browser — nothing is uploaded to any server. Fast, free, and private.
How to Convert WebM to MKV
1
Drop your WebM file
Drag and drop your WebM file onto the converter above, or click to browse. Your file never leaves your device.
2
Click Convert to MKV
AVMint runs ffmpeg in your browser (via WebAssembly) and encodes your video to MKV. No upload needed.
3
Download your MKV file
Once processing finishes, download your new MKV file. Works on all major players, editors, and platforms.