Convert Flash Video (.f4v) to Matroska Video (.mkv) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .f4v 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.
F4V is Adobe's MPEG-4 Flash video container, effectively an MP4 variant with Flash-specific metadata. MKV (Matroska Video) is an open-source, feature-rich container that supports virtually any combination of video, audio, and subtitle codecs without the licensing restrictions of MP4. Converting F4V to MKV moves Flash video content into a modern, flexible container favored by media enthusiasts and archivists.
MKV offers capabilities that F4V (and even MP4) lacks: multiple audio tracks, unlimited subtitle streams, chapter markers, attachments (fonts, artwork), and ordered chapter support for complex media. Converting F4V to MKV is ideal when you want to add subtitles, alternate audio tracks, or chapter navigation to Flash video content. MKV is also the standard container for high-quality video releases and media server libraries (Plex, Jellyfin, Emby).
FFmpeg remuxes the H.264 video and AAC audio from the F4V container directly into Matroska format without re-encoding, preserving original quality. The MKV container stores streams in a hierarchical EBML (Extensible Binary Meta Language) structure that is more robust than F4V's ISO BMFF for handling multiple tracks. Chapter information can be embedded as Matroska chapters. Subtitle tracks (SRT, ASS/SSA, PGS) can be muxed alongside the video during conversion.
When stream copying (default), quality is identical to the source F4V — the video and audio bitstreams are transferred without modification. Only the container format changes. If you choose to add post-processing effects or re-encode for a different codec (e.g., H.265), quality depends on your encoding settings.
| Device | F4V | MKV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
F4V to MKV conversion is a lossless container swap that unlocks MKV's powerful multi-track and metadata capabilities. It is the ideal conversion for media library organization and home theater playback.
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| No |
| الميزة | F4V | MKV |
|---|---|---|
| الاسم الكامل | Flash MP4 Video | Matroska Video |
| الامتداد | .f4v | .mkv |
| الأفضل لـ | MPEG-4 based | Multiple audio tracks |