MKV to WMV Converter
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Supports: MKV
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Need help?MKV vs WMV — Which One Do You Actually Need?
Almost nobody converts MKV to WMV for fun. It happens because something on the Windows side refuses the Matroska file: an older Windows Media Player build, a PowerPoint deck that will only embed Windows Media, a legacy DVR or kiosk player, or an editor that predates MKV support. If that is you, WMV is the right answer and this page gets you there. If your goal is simply "a file that plays everywhere," convert to MKV to MP4 instead — H.264 in MP4 is both smaller and more widely supported than any Windows Media codec.
MKV vs WMV Side by Side
| Property | MKV (source) | WMV (output) |
|---|---|---|
| What it is | Matroska container, standardised as IETF RFC 9559 (October 2024) | An ASF container file; Microsoft defines .wmv as "an ASF file that contains content encoded with the Windows Media … Video codecs" |
| Owner | Open, community-maintained | Microsoft; the Windows Media Format SDK is now flagged legacy in Microsoft's own docs |
| Video codecs offered here | Any (H.264, HEVC, AV1, VP9, MPEG-2 …) | Windows Media Video 8 (default) or Windows Media Video 7 |
| Audio codecs offered here | Any (AAC, Opus, FLAC, DTS, AC-3 …) | WMA v2 (default) or WMA v1 |
| Multiple audio tracks | Yes — commentary, dubs, languages | One audio stream survives the conversion |
| Subtitle tracks | Yes, selectable soft subtitles | Not carried over |
| Chapters | Yes | Not carried over |
| Plays natively on Windows | Windows 11's Media Player does; older builds often do not | Yes, across every Windows generation |
| Plays natively on macOS / iOS | No (VLC or IINA needed) | No (VLC needed) |
| Plays in browsers | No | No |
| Best for | Archiving a full multi-track release | Feeding a Windows-only pipeline that rejects modern containers |
When to Stay on MKV
- You care about the extra audio languages, commentary tracks, or soft subtitles — WMV keeps none of them.
- The file is an archive master. Matroska is an open, documented, actively maintained specification; ASF is a frozen Microsoft format whose SDK is officially legacy.
- Your player situation is fixable. VLC, MPV, IINA, Plex and Jellyfin all handle MKV natively on every desktop OS.
When WMV Is the Right Choice
- A Windows-only application will only ingest Windows Media — some older PowerPoint versions, digital-signage players, courtroom/CCTV review tools and industrial kiosk software behave this way.
- You are handing the file to a machine you do not control that has no codec pack installed. Windows Media Video decodes on a stock Windows install with nothing extra.
- You need a small, low-resolution proxy for a legacy workflow, where compression efficiency matters less than the file simply opening.
How to Convert MKV to WMV
- Upload Your MKV File: Drag the
.mkvonto the page or click "+ Add Files". Queue several and they convert with identical settings. - Check Video Codec and Audio Codec: Video Codec offers WMV 2 (Windows Media Video 8, the default) and WMV 1 (Windows Media Video 7). Audio Codec offers WMA v2 (default) and WMA v1. Leave both on the default unless a specific legacy player demands the older pair.
- Pick a File Compression Mode: Constant Bitrate and Variable Bitrate give the most predictable results on Windows Media; Specific file size targets a byte figure directly; Constraint Quality pairs a quality value with a Max bitrate ceiling.
- Trim or Resize, Then Convert: Under Trim, switch from Unchanged to Time Range to set a Start time and Duration, and use Video resolution to scale down. Click Convert. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours. No sign-up, no watermark.
Choosing a File Compression Mode for WMV
Windows Media Video is a bitrate-driven codec family — it has no x264-style CRF. That changes which modes behave the way you expect.
| Mode | What it does on WMV | Use it when |
|---|---|---|
| Quality Preset (default) | No true quality target exists for this codec, so a bitrate is derived from the source instead. Matroska frequently omits a per-track video bitrate, so that figure comes from container-level metadata | You just want a file out and do not care about the exact size |
| Constant Bitrate | Holds a fixed rate with min/max rails | A streaming or capture pipeline expects a steady rate |
| Variable Bitrate | Target rate with min and max bounds | General-purpose conversion where quality should follow scene complexity |
| Specific file size | Aims for the byte figure you type; leave Auto Scale on so resolution can drop rather than quality collapsing | You have a hard upload or disc-space limit |
| Constant Quality / Constraint Quality | The box labelled CRF here is the MPEG-style quantiser, valid from 1 to 31, where lower is better quality — not an x264 CRF. Constraint Quality also takes a Max bitrate ceiling | You want quality-led encoding; set the value low (roughly 2–6) rather than typing an x264-style 23 |
Frequently Asked Questions
Should I pick WMV 2 or WMV 1?
WMV 2 (Windows Media Video 8) is the default and the better choice in essentially every case — it compresses more efficiently than WMV 1 (Windows Media Video 7) and is just as widely decodable on Windows. Choose WMV 1 only when a specific ancient application has been documented to require it.
Why does my WMV look softer than the MKV did?
Because of the codec generation gap. The MKV probably held H.264, HEVC, or AV1 — codecs designed years after Windows Media Video 7 and 8. Microsoft's own ASF documentation notes that the best compression in ASF comes from the Windows Media 9 Series codecs, and a 9 Series/VC-1 encoder is not available here. At the same bitrate an older codec keeps less detail, so give the WMV a higher bitrate than the source had, or accept the softer result.
What happens to the extra audio tracks, subtitles, and chapters in my MKV?
They do not survive. A Matroska release commonly carries several audio languages, a commentary track, multiple subtitle tracks and chapter markers; the conversion writes a single video stream plus a single audio stream. If those tracks matter, keep the MKV as your master and treat the WMV as a delivery copy.
What number should I type into the CRF box?
Something low. On this page the field feeds the MPEG-style quantiser used by Windows Media Video, which runs from 1 to 31 with lower meaning better quality — the opposite scale size to the 0–51 range people know from x264. Values around 2–6 are high quality; typing 23 out of habit will give you a heavily quantised, blocky file.
Will the WMV play on a Mac, an iPhone, or in a browser?
Not natively. macOS and iOS dropped Windows Media support long ago, and no browser decodes WMV. VLC plays it on every platform, but if your audience is mixed, WMV is the wrong delivery format — use MKV to MP4 for something that plays natively on Windows, macOS, iOS, Android and the web.
Can I convert only a section of the MKV?
Yes. Open Trim, switch from Unchanged to Time Range, then set a Start time and a Duration. Both accept plain seconds or HH:MM:SS.sss. For heavier cutting work — several segments, or a preview before committing — use the video cutter first and convert the result.
Why is my WMV sometimes larger than the source MKV?
Two reasons. Windows Media Video 7 and 8 need more bits than a modern codec for the same visual quality, and the conversion always re-encodes rather than copying the original stream, so nothing carries over from the source's efficiency. If size is the constraint, use Specific file size with Auto Scale, or drop the resolution — the Preset Resolutions dropdown sets a height and lets the width follow the source aspect ratio.
Does the conversion clean up interlacing or HDR while it re-encodes?
No, and this catches people out. There is no deinterlacing anywhere in the pipeline, so a broadcast or DV-sourced MKV keeps its comb lines baked into the WMV. There is no HDR tone-mapping either — an HDR10 or HLG source gets a plain colour conversion and can look flat and desaturated. Deinterlace or tone-map in a desktop tool first if either applies.
My anamorphic MKV came out stretched. What went wrong?
Non-square-pixel sources (DV, VOB rips, some camcorder footage) lose their pixel aspect ratio during conversion, so a frame stored as 720×576 with a widescreen flag ends up displayed square. Fix it by choosing Width x Height under Video resolution and typing the display resolution you actually want, such as 1024×576.
What happens to my file after the conversion?
Your MKV is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared or made public. Our pipeline writes the output as a Windows Media Video 8 video stream with WMA v2 audio inside an ASF container carrying the .wmv extension; every frame is genuinely re-encoded, and there is no stream-copy shortcut.