Convert Windows Media Audio (.wma) to WebM Video (.webm) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .wma file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .webm file when it's ready.
WMA is Microsoft's proprietary audio codec within the ASF container. WebM is Google's open-source multimedia format based on the Matroska container, designed for web content with Vorbis or Opus audio. WebM is natively supported by Chrome, Firefox, Edge, and Android, making it the premier open-format choice for web audio and video.
Converting WMA to WebM re-encodes the audio using Opus (the preferred WebM audio codec) and wraps it in the WebM container. This brings Microsoft-era audio into the modern web, where Opus in WebM delivers the best quality-per-bitrate of any web-compatible format.
WebM with Opus encoding outperforms every other web audio format in quality-per-bitrate. Opus delivers transparent audio quality at 128 kbps and handles both speech and music efficiently through its hybrid SILK/CELT design. Chrome, Firefox, and Edge support WebM natively without plugins.
For web developers, WebM is royalty-free and open-source, with no patent licensing concerns. Converting WMA to WebM modernizes legacy Windows audio for contemporary web delivery, HTML5 applications, and Progressive Web Apps.
FFmpeg decodes the WMA stream from its ASF container and encodes using the libopus encoder into a WebM container. Opus supports bitrates from 6 to 510 kbps with automatic mode selection — SILK for speech, CELT for music, hybrid for mixed content. The WebM container restricts audio codecs to Vorbis and Opus. Metadata is stored in WebM's EBML structure. The conversion is a lossy-to-lossy transcode.
Opus at 128 kbps exceeds the quality of WMA Standard at 192 kbps. Even after the transcoding quality loss, Opus's superior codec efficiency often produces output that sounds as good as or better than the WMA source at a matching bitrate. At 64 kbps Opus, quality remains good for both speech and music.
| Device | WMA | WebM |
|---|---|---|
| Windows PC | Native | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
WMA to WebM with Opus encoding modernizes legacy Windows audio for the web with superior codec quality and universal browser support.
Biztonsagos atvitel
HTTPS titkositott feltoltes
Adatvedelmi prioritas
A fajlok feldolgozas utan automatikusan torlodnek
Regisztracio nem szukseges
Azonnal kezdhet konvertalni
Mindenhol mukodik
Barmely bongeszo, barmely eszkoz
| Native |
| Jellemzo | WMA | WebM |
|---|---|---|
| Teljes nev | Windows Media Audio | WebM Video |
| Kiterjesztes | .wma | .webm |
| Leginkabb ajanlott | Windows native | Web optimized |