Convert WMV to MKV Online
Convert Windows Media WMV to the open Matroska MKV container.
.wmv · up to 100 MB
What you can do
WMV to MKV: from Microsoft to the open standard
Full compatibility
MKV works in Plex, Jellyfin, Kodi, VLC, and any modern player without Windows restrictions.
Corporate archive
Training materials, meetings, and WMV presentations preserved in a container built to last decades.
No DRM issues
Your own DRM-free WMV files convert without problems. Only the container changes.
100% private
Conversion happens in your browser. Your corporate videos never leave your device.
How it works
Three steps, no hassle
Upload your WMV file
Drag or select your .wmv file. Corporate videos, training materials, meeting recordings, or personal archives from the Windows XP/Vista/7 era.
Convert to MKV
The VC-1, WMV3, or WMV2 stream transfers to the Matroska container. No re-encoding when possible, preserving original quality.
Download your MKV
MKV file compatible with Plex, Jellyfin, Kodi, and VLC. Ready for your media library without platform restrictions.
FAQ
Got questions?
WMV (Windows Media Video) is Microsoft's video format, part of the Windows Media ecosystem introduced with Windows Media Player 6.4 in 1999. WMV1 and WMV2 codecs (based on modified H.263) dominated Windows video distribution during the XP era (2001–2007). WMV3 (also called VC-1 Simple/Main Profile) launched in 2003 and is the technical core of the SMPTE VC-1 standard approved in 2006. WMV was the default output of Windows Movie Maker (included in Windows XP and Vista), Microsoft Producer for PowerPoint, and SharePoint for corporate video.
WMV files with Microsoft DRM — used in purchase or rental content from stores like Zune Marketplace — cannot be converted without the corresponding licenses, as the content is encrypted and the key depends on the license tied to your Microsoft account. DRM-free WMV files (your own recordings, corporate training, camera archives) convert without any issue. The vast majority of WMV files people need to convert have no DRM.
For DRM-free WMV files, conversion is a container remux when the stream is VC-1 or WMV3: video bytes are copied directly into the Matroska container without re-encoding. Quality is identical to the original. If the file uses WMV1 or WMV2 (older codecs with limited Matroska support), re-encoding to H.264 may be needed, which involves some loss — though imperceptible with the right quality settings.
Plex and Jellyfin support direct play of MKV with H.264, H.265, and some VC-1 streams, but WMV files in ASF containers typically require real-time transcoding because ASF's metadata and chapter handling differs from the Matroska standard expected by Plex/Jellyfin clients. Converting to MKV eliminates this problem and enables direct play without server CPU usage.
ASF (Advanced Systems Format) is Microsoft's container designed in 1996 for adaptive streaming. WMV is the video codec inside an ASF, just as WMA is the audio. A .wmv file is technically an ASF container holding a WMV stream. ASF has real-time indexing and proprietary Microsoft metadata support, but it is not natively parseable by non-Microsoft players without implementing the full ASF protocol. Matroska replaces ASF with a fully open, documented specification.
Yes. Once converted to MKV, you can use MKVToolNix to add SRT or SSA/ASS subtitle tracks. This is especially useful for corporate training sessions or conference WMV files you want to make accessible. ASF/WMV has SAMI subtitle support, but it's not widely compatible outside the Windows Media ecosystem. MKV with SRT is the de facto standard for subtitles in modern players.
Convert WMV to MKV: from Microsoft's proprietary container to the open standard
WMV (Windows Media Video) represents Microsoft's multimedia legacy in hundreds of millions of files produced between 1999 and 2015. The Windows Media ecosystem was designed to dominate video distribution in the desktop PC era: Windows Media Player, included in Windows 98 SE, Windows XP, and all successors, made WMV the default format for screen recordings (Camtasia used WMV by default until 2008), recorded presentations (Microsoft Producer for PowerPoint exported exclusively to WMV from 2002 to 2007), corporate training on SharePoint, and university video content from the 2000s. WMV's native container is ASF (Advanced Systems Format), a proprietary Microsoft format developed in 1996 originally for adaptive streaming before HTTP Live Streaming or DASH existed. ASF has built-in temporal indexing, multiple stream support, and proprietary metadata capabilities, but it is not natively parseable by non-Microsoft players without implementing the full ASF protocol.
Modernizing corporate WMV archives to MKV has immediate practical implications for organizations with historical training or internal communication archives. Plex Media Server and Jellyfin (fork of the Emby project, released as open source in December 2018) handle MKV with direct play for compatible clients, eliminating the real-time transcoding that WMV/ASF frequently requires. Real-time VC-1 transcoding consumes 3x to 8x more server resources than direct play of H.264 in MKV for the same content, depending on resolution and bitrate. MKV also allows adding SRT, SSA/ASS, or VobSub subtitle tracks as selectable streams at playback time, especially valuable for making historical corporate content accessible. The VC-1 standard (SMPTE 421M, approved April 2006) is fully documented and supported in Matroska with codec ID V_MS/VFW/FOURCC or V_VC1, ensuring long-term compatibility.
Convertir.ai processes WMV to MKV conversion in the browser using FFmpeg.wasm. For WMV files with VC-1 (WMV3) and no DRM, FFmpeg performs a direct remux of the VC-1 stream from the ASF container to Matroska, preserving video bytes without modification. WMA (Windows Media Audio) is re-encoded to AAC for maximum Matroska compatibility, as WMA has variable support in non-Microsoft players. For files with WMV1 or WMV2, FFmpeg applies decode and re-encode to H.264 with CRF 18 by default, producing files visually identical to the original with better compatibility. WMV files with Microsoft DRM (PlayReady or Windows Media DRM 10 encryption) are not processable and will return an error — this is expected and correct: DRM protects the content owner's rights. For your own DRM-free corporate files, the process is fully transparent with no quantity limits.