Convert XviD to MKV — Free Online Converter
Convert XviD MPEG-4 Video (.xvid) to Matroska Video (.mkv) online for free. Fast, secure video conversion with no watermarks or registration....
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How to Convert
Upload your .xvid 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 XviD to MKV Conversion
XviD, the open-source MPEG-4 Part 2 codec born from reverse-engineering DivX, became the standard codec for scene releases and internet video sharing during the 2000s. The name — DivX spelled backwards — declared its community-driven, anti-proprietary philosophy. XviD files in AVI containers, typically at the iconic 700 MB CD-rip size, were the dominant format for sharing movies before H.264 and MKV took over.
MKV (Matroska Video) is the modern open-source container that succeeded AVI as the preferred format for high-quality video distribution. Matroska supports virtually any video and audio codec, multiple subtitle tracks, chapter markers, and rich metadata — all features that AVI fundamentally lacks. Converting XviD to MKV brings scene-era content into the modern container ecosystem.
Why Convert XviD to MKV?
AVI has severe technical limitations that make XviD files problematic for modern workflows. AVI does not support variable frame rate content, has unreliable subtitle embedding, lacks chapter marker support, and has a practical file size limit of 2 GB (or 4 GB with OpenDML extensions). MKV eliminates all of these limitations while maintaining the open-source philosophy that both XviD and Matroska share.
MKV also enables proper soft subtitle support. XviD scene releases commonly shipped with separate SRT subtitle files — MKV can multiplex these directly into the container alongside the video, creating a single self-contained file with selectable subtitle tracks. For anyone managing a legacy XviD collection, MKV remuxing is the most straightforward upgrade path.
Common Use Cases
- Remuxing XviD scene releases into MKV to embed external SRT subtitles as selectable tracks
- Consolidating XviD video, audio, and subtitle files into single MKV packages for media servers
- Upgrading XviD collections for Plex, Jellyfin, or Kodi libraries that handle MKV metadata better than AVI
- Adding chapter markers to XviD movie files that were impossible in the AVI container
- Preparing XviD content for streaming setups that prefer MKV's modern container features
How It Works
For remuxing (container change only), FFmpeg copies the XviD MPEG-4 Part 2 video and MP3 audio streams directly into the MKV container without re-encoding — this is nearly instantaneous and introduces zero quality loss. External SRT/ASS/SSA subtitle files can be multiplexed in the same operation. For full transcoding, the video is decoded from MPEG-4 ASP and re-encoded to H.264 or H.265 within MKV for better compression and modern device compatibility.
Quality & Performance
Remuxing preserves 100% of the original XviD quality — the video and audio bitstreams are copied without modification. Full transcoding to H.264 can produce better visual quality at the same file size (or the same quality at a smaller file size) due to H.264's superior compression efficiency. XviD's typical 800-1500 kbps at 480p can be matched at 500-900 kbps in H.264 with equivalent visual quality.
Device Compatibility
| Device | XviD | MKV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Use remux mode (stream copy) for a lossless, near-instant container upgrade that preserves the original XviD quality exactly
- 2Multiplex external SRT subtitle files during conversion to create self-contained MKV packages
- 3Add chapter markers for movies to enable scene navigation in media players
- 4If re-encoding, use H.264 at CRF 18-20 to match or exceed the original XviD visual quality in a smaller file
- 5Batch-remux entire XviD scene release collections to efficiently upgrade them for modern media servers
XviD to MKV conversion brings the open-source scene release era's content into the modern open-source container ecosystem, with options ranging from lossless remuxing to full H.264 transcoding for maximum efficiency.