How to convert Windows Media (WMV) to WebM
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Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
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Convert Windows Media (WMV) to WebM
NexMedia converts Windows Media (WMV) to WebM on its own servers. Processing time depends on the file size and how busy the queue is.
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Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About Windows Media (WMV)
Windows Media Video (WMV) is Microsoft's family of video codecs, stored in the ASF container.
Older Windows software, Windows Movie Maker projects and video from the 2000s.
WMV files can carry DRM, and many devices outside Windows do not play WMV.
Convert WMV to WebM online free, no account required — WebM is an open, royalty-free web video format with VP8, VP9 or AV1 video and Opus or Vorbis audio.
Change WMV to WebM without losing quality — convert WMV to WebM free in your browser.
Why does my WMV video refuse to play on my Mac or iPhone? Windows Media Video uses Microsoft codecs that Apple and Android devices don't include, so a conversion to MP4 is the quickest fix.
About WebM
WebM is an open, royalty-free video format developed by Google and based on the Matroska container. It holds VP8, VP9 or AV1 video with Vorbis or Opus audio.
It is made for the web: all major browsers play it in the HTML video element, and it is common for screen recordings and short clips.
WebM allows only its own small set of codecs, so H.264 video or AAC audio has to be re-encoded to fit.
Why convert video to WebM for a website? Browsers play it without plugins, and VP9 or AV1 compresses smaller than H.264 at the same quality, so pages load faster.
What changes when you convert WMV to WebM
- The WMV is re-encoded into WebM at the default quality settings, so the result looks close to the original but is not bit-identical.
- WMV files can carry DRM copy protection; protected files are detected and refused, because copy protection is never removed.
Settings you can change
Before you convert WMV to WebM, you can adjust: Video codec, Rate control, Quality (CRF), Video bitrate, Resolution, Width, Height, Scale fit, Frame rate, Encoder preset, Audio codec, Audio bitrate, Trim start, Trim duration, and Remove metadata.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted WebM file is kept for 2 hours, then deleted.
WMV to WebM: questions and answers
Does converting WMV to WebM reduce quality?
The WMV is re-encoded into WebM at the default quality settings, so the result looks close to the original but is not bit-identical.
What is the difference between WMV and WebM?
WMV is Microsoft's Windows Media video format. WebM is an open, royalty-free web video format with VP8, VP9 or AV1 video and Opus or Vorbis audio.
Can I change the settings when converting WMV to WebM?
Before you convert WMV to WebM, you can adjust: Video codec, Rate control, Quality (CRF), Video bitrate, Resolution, Width, Height, Scale fit, Frame rate, Encoder preset, Audio codec, Audio bitrate, Trim start, Trim duration, and Remove metadata.
Do I need an account to convert WMV to WebM?
No. You can convert WMV to WebM without an account; signing in raises the file-size and daily limits.
How long is my converted WebM file kept?
The WebM file you convert from WMV is kept for 2 hours, then deleted automatically.
What happens if my WMV file is copy-protected?
WMV files can carry DRM copy protection; protected files are detected and refused, because copy protection is never removed.
When I convert WMV to WebM, is the video re-encoded?
The WMV is re-encoded into WebM at the default quality settings, so the result looks close to the original but is not bit-identical.