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WMV to WebM Converter — Free, Online, No Upload

Publish your old WMV video library on the web — WebM plays in every modern browser without plugins.

Free · no signup2 free files a day100% in-browser · no upload

Tap to select WMV files

or click to browse

2 free files per day (2 left today) · Up to 10 MB each · Upgrade for more

✓ Files never uploaded✓ 100% browser-based✓ No account required
Need the reverse?WEBM → WMV

How to convert WMV to WEBM online

  1. 1

    Drop your WMV file

    Drag your Windows Media Video file onto the box above, or click it to pick a file.

  2. 2

    Wait a few seconds

    Conversion starts on its own and runs on your device, not on a server.

  3. 3

    Download your WEBM

    Click Download to save the WebM Video Format file.

WMV vs WEBM: format overview

WMV

Windows Media Video

Microsoft · 2003

Compression
lossy
Transparency
No
  • ✓ Good compression for Windows-native workflows
  • ✓ DRM support for content protection
  • ✗ Not supported on macOS, iOS, Android natively
WEBM

WebM Video Format

Google (On2 Technologies) · 2010

Compression
lossy
Transparency
No
  • ✓ Royalty-free codec (VP8/VP9/AV1)
  • ✓ Excellent web streaming support

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

WEBM magic bytes: 1A 45 DF A3

Why convert WMV to WEBM?

WMV files cannot be played in a web browser using the HTML5 video element. Chrome, Firefox, Safari, and Edge all reject WMV as an unsupported format for native web playback. If you have corporate videos, training content, or recorded presentations in WMV format and want to embed them on a website or web application, you need a format the browser actually understands.

WebM is the open, royalty-free video format designed specifically for HTML5 web embedding. It holds open codecs such as VP8, VP9 and Opus, with no licensing requirements. Chrome, Firefox, and Edge support WebM natively and completely. It delivers excellent compression at low file sizes, making it ideal for web delivery where bandwidth and load time matter.

Converting WMV to WebM transcodes the Windows Media Video to VP8 and the WMA audio to Opus, producing a file that embeds directly in an HTML5 video element without any plugins or media servers. The conversion is a re-encode with fixed settings (video capped near 2 Mbps), which introduces a small quality change. Note that Safari has historically had limited WebM support, so serving MP4 alongside WebM as a fallback is recommended for full browser coverage.

Quality & file size: WMV to WEBM

Typical sizes: WMV 50–150 MB (1 minute 720p); WEBM 50–200 MB (1 minute 1080p).

Frequently asked questions

Is WebM a good format for embedding old WMV footage on a website?
Yes — WebM is the royalty-free, browser-native video format. This converter writes VP8 video with Opus sound, so old footage plays on any website without Flash, QuickTime, or Windows Media plugins.
Will the WebM be smaller than the WMV?
It depends on the WMV. This converter writes VP8 video capped near 2 Mbps with 128 kbps Opus sound, so a high-bitrate WMV shrinks, while a small, low-bitrate one can grow.

Your WMV file never leaves this tab — FormatDrop has no endpoint that receives file data. How it works