Convert WebM to MKV — Free Online
Convert WebM Video to Matroska Video format online. Open container with advanced features. Free converter with no registration, no watermarks....
Drop files here or click to browse
Supports: WEBM files
Max: 100MB (free) · 2GB (Pro)
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HTTPS encrypted uploads
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Files auto-deleted after processing
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Works Everywhere
Any browser, any device
How to Convert
Upload your .webm file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mkv file when it's ready.
About WebM to MKV Conversion
WebM Video (WebM) files are widely used for HTML5 video and YouTube and Web embedding, but when you need maximum device compatibility, converting to MKV becomes essential. Our WebM to MKV converter handles the technical complexity of video transcoding, producing optimized output that maintains visual fidelity while ensuring smooth playback across all your devices.
Why Convert WebM to MKV?
**Cross-Platform Access:** While WebM works within specific ecosystems, MKV transcends platform boundaries. Share your converted files with colleagues, friends, or clients regardless of their device preferences or operating system.
**Format Advantages:** Open container with advanced features. These characteristics make MKV particularly valuable for HD video archival, potentially improving on WebM's capabilities for specific applications.
**File Size Optimization:** MKV format often achieves efficient file sizes through optimized encoding. This matters for storage, sharing, and bandwidth-conscious applications.
Common Use Cases
- Share WebM videos on social media platforms that prefer MKV
- Play HTML5 video content on devices without WebM support
- Import WebM footage into video editing software requiring MKV
- Stream video content using MKV's optimized delivery
- Archive WebM videos in the more universal MKV format
How It Works
Our converter leverages FFmpeg multimedia framework for precise WebM to MKV transformation. This professional-grade engine handles Google-developed format using VP8/VP9 video with Vorbis/Opus audio input and produces open standard container supporting virtually any codec combination output.
The conversion process decodes your WebM content fully, then re-encodes using MKV's optimal settings. This ensures multiple audio tracks in the final file.
Processing happens on secure cloud infrastructure with automatic file deletion after conversion. Your video files never touch local storage.
Quality & Performance
High-quality encoding ensures the MKV output is practically indistinguishable from your WebM source under normal playback conditions.
Start converting your WebM files to MKV format now. Our free online converter delivers high-quality results with fast processing, secure handling, and no software installation required.