Is this MKV to WMV converter really free?

Yes. Up to 5 files at a time, no signup, no catch. The free tier adds a small watermark to image output — Pro ($9.99/mo or $49/yr) removes it, raises the file size limit to 500 MB, and unlocks unlimited batch conversion.

Are my files uploaded to a server?

No — and you can verify it yourself. Open DevTools → Network tab, then convert a file. You'll see zero upload requests. Everything runs right in your browser. We never see your files.

How long does conversion take?

Usually 1–3 seconds for a typical file. The very first conversion on a fresh page load may take 5–20 seconds while the converter engine loads — after that it's instant. Your CPU does all the work locally.

What is the file size limit?

Free: up to 10 MB per file, 5 files per batch. Pro: up to 500 MB per file, unlimited batch. If you're working with large videos or RAW photos, Pro is built for that.

Can I batch convert multiple MKV files at once?

Yes — drop multiple files at once (or Ctrl/Cmd+click to select them) and they all convert in parallel. Free accounts handle up to 5 files per batch; Pro has no limit.

How large can my video files be?

Free accounts support files up to 10 MB — enough for short clips and GIFs. Pro raises that to 500 MB, which covers most 1080p videos. For files over 1 GB, a native app like HandBrake will be faster.

Will the video lose quality during conversion?

When only the container changes (e.g., MKV → MP4 where both use H.264), there's zero quality loss — it's a lossless rewrap. When the codec changes, we encode at CRF 23, which is near-transparent for most content.

What Windows software specifically requires WMV?

Older versions of Windows Movie Maker, some corporate video kiosks, Windows Media Center, and legacy digital signage systems only accept WMV. Modern software (VLC, PotPlayer) handles MKV fine.

How does WMV compare to MKV in terms of video quality?

At equivalent bitrates, modern codecs (H.264/H.265 in MKV) outperform WMV's VC-1 or WMV3 codec. Converting MKV to WMV at a high bitrate minimises the quality difference.

How private is this converter?

Completely private — by design, not policy. There is no upload endpoint. Files are processed right inside your browser tab and disappear the moment you close it. We collect only anonymous page-view counts; your file content is never seen or stored.

MKV to WMV Converter — Free, Online, No Upload

How to convert MKV to WMV online

1
Drop your MKV file
Drag and drop your Matroska Video file onto the converter, or click to browse your files. You can select up to 5 at once. Nothing leaves your device — conversion happens right here in the browser.
2
Hit Convert — it happens locally
Click Convert and watch it go. There's no upload, no server queue, no waiting. The converter runs Matroska Video → Windows Media Video entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your WMV
Your Windows Media Video file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

MKV vs WMV: format overview

MKV

Matroska Video

Matroska.org · 2002

Compression: lossy
Transparency: No

✓ Supports virtually any codec combination
✓ Multiple audio tracks and subtitles per file
✗ Not natively supported by iOS or older devices

WMV

Windows Media Video

Microsoft · 2003

Compression: lossy
Transparency: No

✓ Good compression for Windows-native workflows
✓ DRM support for content protection

MKV magic bytes: 1A 45 DF A3

WMV magic bytes: 30 26 B2 75 8E 66 CF 11

Why convert MKV to WMV?

MKV is a Linux and open-source friendly container, but it creates real friction in Windows-centric corporate environments. Enterprise video systems, SharePoint document libraries, older Windows-based LMS platforms, and some hardware kiosk systems all expect WMV — a format they were configured for years ago and have never updated. Submitting an MKV to these systems typically results in an error or a broken player.

WMV was Microsoft's corporate video standard, and it remains deeply embedded in institutional Windows workflows. Windows Media Player handles it natively. SharePoint's built-in media player is optimized for WMV. Older corporate training platforms, legal discovery archives, and government-mandated submission systems often have WMV as their only accepted video format. For video that must enter these systems, WMV is a hard requirement.

Converting MKV to WMV re-encodes the H.264 or H.265 video to Windows Media Video and the audio to WMA inside a Windows container. This is a compatibility conversion, not a quality upgrade — WMV's codec is less efficient than H.264, so the resulting file may be similar in size or larger. The output will work natively in Windows Media Player and any Windows-based corporate system without requiring additional codecs. Use this conversion specifically when the destination system cannot accept MKV.

Quality & file size: MKV to WMV

Typical file sizes: MKV 200–800 MB → WMV 50–150 MB.

Both MKV and WMV use lossy compression. We transcode at high quality settings (equivalent to WMV's recommended web quality) to minimize generational loss.

Color depth: MKV supports standard color, WMV supports standard color.

Transparency: MKV does not support transparency. WMV does not support transparency — transparent areas become solid white.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your MKVfiles are converted 100% inside your browser. They are never uploaded to our servers, never stored, and never seen by anyone other than you. This isn't a privacy policy claim — it's an architectural guarantee: our server has no endpoint that receives file bytes.