Free online H.264 to Matroska Video converter. Files are processed locally in your browser — no uploads, 100% private.
Drop your .H.264 file here
or click to browse from your device
100% browser-based — no server uploads, no cloud processing
Free forever — no account or subscription required
Supports batch conversion for multiple files at once
Works on any device — desktop, tablet, and mobile
Results available in seconds — no server queue or wait time
Files are cleared immediately after processing for maximum privacy
Raw H.264/AVC video bitstream
Open multimedia container supporting all codecs
MKV is an industry-standard format with universal support
Source: Raw H.264/AVC video bitstream
Output: Open multimedia container supporting all codecs
100% browser-based processing — files never leave your device
Large file sizes require significant storage
Re-encoding always causes quality loss
Codec compatibility varies across devices and platforms
Social media video uploads and streaming
Video editing and post-production workflows
Web embedding and HTML5 video playback
Long-term video archiving and distribution
Always convert from the highest-quality source available to minimize generational loss
H.264 in an MP4 container has the widest compatibility across devices and platforms
Use two-pass encoding for precise bitrate control in long archiving workflows
Check audio sync after conversion — delay issues can emerge between formats
Drag & drop your file or click to browse
Files are processed instantly in your browser
Save your converted or processed file
Upload your H.264 file using the drop zone above. Your file is instantly converted to MKV format right in your browser — no server upload, no waiting.
Completely. Our converter processes your H.264 file 100% in your browser using client-side code. It never leaves your device or touches any external server.
It depends on the formats. Converting from lossless to lossy (e.g. PNG to JPEG) may reduce quality. Converting lossless-to-lossless (e.g. PNG to WebP lossless) preserves all quality.
Free, instant, and 100% private. Your files are processed locally in your browser.