MKV Video Converter & Editor
MKV (Matroska) is a flexible open-source container that can hold virtually any video, audio, and subtitle combination. It is the default output of many recording and encoding tools, including OBS, HandBrake, and MakeMKV. FastEdit lets you convert, trim, and re-encode MKV files directly in your browser, no software to install, no files to upload.
The most common need is converting MKV to MP4 for playback on devices that don't support Matroska natively. FastEdit handles this in seconds, preserving quality or re-encoding with your choice of codec.
Container Matroska (.mkv, .mk3d, .mka, .mks)
Video Codecs H.264, H.265, VP8, VP9, AV1, MPEG-4, and many more
Audio Codecs AAC, MP3, FLAC, Opus, Vorbis, AC3, DTS, and more
Subtitle Support SRT, ASS/SSA, VobSub, PGS (embedded in container)
Features
- Convert MKV to MP4, WebM, or animated image formats (WebP, GIF, APNG) entirely in the browser
- Trim and cut MKV video to extract specific segments without re-encoding the entire file
- Re-encode MKV video tracks with H.264, H.265, VP9, or AV1 codecs for optimal compression
- Crop and resize MKV video to fit specific resolution requirements or platform presets
- Extract clips as animated WebP or GIF for sharing in chat, documentation, or social media
- Blur and redact regions of MKV video to protect sensitive information before conversion
Use Cases
- Converting MKV screen recordings from OBS to MP4 for sharing with team members who can't play MKV
- Extracting specific scenes from MKV files as short MP4 clips for presentations or social media
- Converting MKV video to web-friendly formats (MP4 H.264, WebM VP9) for HTML5 video embedding
- Trimming large MKV recordings down to relevant segments before archiving or uploading
- Creating animated GIFs or WebP clips from MKV source video for documentation and tutorials
Technical Specifications
Container Matroska (.mkv, .mk3d, .mka, .mks)
Video Codecs H.264, H.265, VP8, VP9, AV1, MPEG-4, and many more
Audio Codecs AAC, MP3, FLAC, Opus, Vorbis, AC3, DTS, and more
Subtitle Support SRT, ASS/SSA, VobSub, PGS (embedded in container)
Browser Playback Not natively supported, requires conversion for web delivery
Max Resolution No container limit, depends on codec
Key Advantage Supports virtually any codec combination in a single file
MIME Type video/x-matroska