MKV to WMV Converter

Turn an MKV into a WMV that plays straight away in Windows Media Player and PowerPoint, free in your browser, with no signup and no watermark.

Select MKV file →

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Click or drag and drop to upload files

We support most file types including: MP4, MOV, WEBM, AVI, MP3, WAV, PNG, JPEG, GIF, MKV, PDF, FLAC, TIFF!

EchoWave is used by creators, marketers, educators, and businesses to convert and edit media online.

Updated June 2026

Windows Media Player will not open an MKV without an extra codec pack, which is the usual reason people convert MKV to WMV. WMV is Microsoft's own video format, so it plays on a Windows PC with nothing added and drops cleanly into PowerPoint slides. WMV also compresses tightly, so the file is often smaller than the MKV it came from. EchoWave converts MKV to WMV free in your browser, with no signup and no watermark.

Free, no sign-upNo account, no trial

Runs in your browserNothing to install

Works on every devicePhone, tablet, laptop

No watermarkClean output, every time

How it works

How to convert MKV to WMV

1
Upload your MKV
Drag your MKV onto the converter or pick it from your device. Nothing to install.
2
Choose WMV and convert
Select WMV as the output and start. Free, with no sign-up and no watermark.
3
Download your WMV
Save the finished WMV, or open it in the editor to trim, crop, or resize it first.

Try it

Estimate your WMV

Pick a video bitrate and a length to see the WMV file size before you convert.

Video bitrate

Length5 min

1 min30 min

Estimated WMV size183MBSharp 1080p

An estimate. Real size varies with resolution, frame rate, and how much the picture moves.

The formats

MKV vs WMV

MKV

Matroska Video

An open container that holds almost anything

Type: Open video container
Holds: Almost any codec, plus several audio and subtitle tracks
Typical size: Large, depends on the codec inside
Plays on: VLC and most modern players, less on default phone apps

Best for:Movies with multiple audio tracks and subtitles

WMV

Windows Media Video

Windows Media video, small and Windows-first

Type: Windows Media video
Holds: Windows Media video with WMA audio
Typical size: Small, built for Windows
Plays on: Windows Media Player and VLC

Best for:Older Windows video and slideshows

Will it lose quality?

When the codecs already match WMV, the converter can change the container without re-encoding, so the picture stays identical.
When the video has to be re-encoded for WMV, a high bitrate keeps it visually close to the MKV.
Converting cannot add detail the MKV never had. The output is at best as good as the source.

Use cases

What people use it for

Play anywhereMake a clip your device supports

Video editorsGet footage your software accepts

Web videoUse a format browsers play

CourseworkHand in a standard video file

SharingSend a clip people can open

Troubleshooting

If something looks off

The WMV will not play

Some players are picky about codecs. Try it in VLC, which opens almost anything, or convert again and let the converter re-encode the video.

The file got larger

A format change can shift the size, and re-encoding at a high bitrate adds overhead. Lower the bitrate or trim the clip for a smaller file.

Audio and video drift out of sync

Re-download the source and convert again. If a long recording drifts, splitting it into shorter pieces usually fixes the sync.

FAQ

MKV to WMV questions

Is the MKV to WMV converter free?

Yes. EchoWave converts MKV to WMV with no signup, no file-count limit, no trial, and no watermark. Upload the MKV, convert it, and download the WMV from your browser.

How do I convert MKV to WMV?

Upload your MKV, choose WMV as the output format, and start the conversion. When it finishes, download the WMV or open it in the editor to trim, crop, or resize it first.

Why convert MKV to WMV instead of just playing the MKV?

Windows Media Player does not open MKV by default, so you either install a codec pack or convert. WMV is Microsoft's native video format and plays on any Windows PC with nothing extra, which also makes it the safe choice for embedding a clip in a PowerPoint deck.

Will converting MKV to WMV reduce the quality?

WMV uses a different codec from most MKV files, so the video is re-encoded rather than copied. A high bitrate keeps it visually close to the source, but converting cannot add detail the MKV never had, so the WMV is at best as good as the original.

Why is the WMV smaller than the MKV?

WMV was built for efficient compression and streaming on Windows, so it often lands smaller than the MKV it came from, commonly around 5 to 10 MB per minute. If you need an even smaller file, lower the bitrate or trim the clip before converting.

What happens to the subtitles and extra audio tracks in my MKV?

MKV can carry several audio tracks and soft subtitles, but WMV does not support them the same way. The converter keeps the main video and audio. If you need a specific subtitle or language track, burn it in or pick that track in the editor before converting.

After converting MKV to WMV, what plays the file?

Windows Media Player opens WMV natively on Windows, and VLC plays it on any system, including Mac and Linux. On a Mac it is often easier to convert to MP4 instead, since macOS does not handle WMV well by default.

Does the MKV to WMV converter work on Mac and Windows?

Yes. The converter runs in any browser on macOS, Windows, Chromebook, and Linux, so you can create a WMV even from a Mac. There is nothing to download and no account to create.

Can I convert a large MKV or several files?

Yes. There are no file-count limits on these pages, so you can convert your videos one after another. Large MKV files are supported and simply take a little longer to upload and convert.

Should I use WMV at all, or pick a more modern format?

WMV is the right choice for older Windows playback and PowerPoint. For sharing online, on phones, or with anyone on a Mac, MP4 or WebM is more universal and usually smaller for the same quality.