CONVERT WMA → OPUS (WMA to OPUS)
Fast, secure WMA to OPUS conversion. No registration required.
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HOW TO CONVERT WMA → OPUS
Give us the WMA
Select a WMA (or several for batch). We read the header to pick decoder settings automatically.
Re-encode to OPUS
The audio is decoded, optionally resampled, and re-encoded as OPUS at transparent default bitrate.
Retrieve your OPUS
Grab the download as soon as it is ready. Typical jobs finish in seconds for short clips.
WMA is Microsoft's proprietary audio codec, historically tied to Windows Media Player. That is why users land on this page looking for a OPUS copy. Turn your WMA audio into a widely-supported OPUS file. The conversion happens server-side through FFmpeg — the same engine behind every major audio editor — so the output plays cleanly on phones, car stereos, DJ software and streaming tools. One more beat. WMA is Microsoft's proprietary audio codec, historically tied to Windows Media Player. Receiving format: Opus is the modern low-latency royalty-free codec used in VoIP, streaming, and WebRTC.
Why convert WMA to OPUS
The motivation for a WMA → OPUS conversion is almost always practical: a playback device, hosting platform or editing suite that insists on OPUS. The audio quality trade-off is controllable via bitrate; the compatibility win is immediate and unambiguous.
WMA vs OPUS — Technical specifications
Side-by-side comparison of the technical details.
WMA
- MIME type
- audio/x-ms-wma
- Extension
- .wma
- Container
- ASF (Advanced Systems Format)
- Variants
- WMA Standard, WMA Pro, WMA Lossless, WMA Voice
- Max bitrate
- 768 kbps (WMA Pro)
- MIME Type
- audio/x-ms-wma
- Category
- Audio Files
- Full Name
- Windows Media Audio
- Conversion Engine
- FFMPEG
OPUS
- MIME type
- audio/opus
- Extension
- .opus
- MIME Type
- audio/opus
- Category
- Audio Files
- Full Name
- Opus Audio
- Conversion Engine
- FFMPEG
- Extensions
- .opus, .ogg (container)
- Standard
- RFC 6716 (2012)
- Sample rates
- 8, 12, 16, 24, 48 kHz
- Latency
- 5-60 ms (configurable)
| Specification | WMA | OPUS |
|---|---|---|
| MIME type | audio/x-ms-wma | audio/opus |
| Extension | .wma | .opus |
| Container | ASF (Advanced Systems Format) | — |
| Variants | WMA Standard, WMA Pro, WMA Lossless, WMA Voice | — |
| Max bitrate | 768 kbps (WMA Pro) | — |
| MIME Type | audio/x-ms-wma | audio/opus |
| Category | Audio Files | Audio Files |
| Full Name | Windows Media Audio | Opus Audio |
| Conversion Engine | FFMPEG | FFMPEG |
| Extensions | — | .opus, .ogg (container) |
| Standard | — | RFC 6716 (2012) |
| Sample rates | — | 8, 12, 16, 24, 48 kHz |
| Latency | — | 5-60 ms (configurable) |
WMA vs OPUS — Strengths and limitations
What each format does best, and where it falls short.
WMA Strengths
- Good quality at low bitrates (32-64 kbps) — outperformed MP3 in that range.
- Native playback on every Windows version 2000 through 10.
- Lossless variant available (WMA Lossless) for archiving.
- Supports multichannel 5.1 surround audio.
Limitations
- Proprietary — poor support outside Windows and Windows Media Player.
- DRM variants made files brittle — many purchased tracks became unplayable when stores shut down.
- Ecosystem abandoned — no modern editors, hardware decoders, or streaming services use WMA.
OPUS Strengths
- Best-in-class quality across the entire bitrate range.
- Royalty-free and patent-free.
- Ultra-low latency — suitable for live voice and music.
- Handles speech and music equally well — no need to switch codecs.
- Mandatory codec in WebRTC, so supported in every browser by design.
Limitations
- Very low hardware decoder adoption — software-only on most phones.
- Older platforms (legacy Windows apps, old cars) may not play .opus files.
- Container semantics confusing — Opus lives inside Ogg, WebM, or MP4.
Quality & Compatibility
The OPUS output is as good as the WMA source allows. If the WMA was encoded at 96 kbps, the OPUS cannot reconstruct detail the encoder already dropped; picking a very high OPUS bitrate just produces a larger file. Match OPUS bitrate to the WMA quality for the best balance.
Tips for Best Results
- Sample-rate mismatches between WMA and target device (48 kHz phone output from a 44.1 kHz track) are handled automatically; no manual resampling needed.
- For audiobook delivery, match the platform spec exactly — ACX requires 192 kbps CBR 44.1 kHz stereo, for example.
- Batch-convert an album in one job so every track shares identical encoder settings and loudness normalisation.
Frequently Asked Questions
Lossy-to-lossy conversions (most combinations) re-compress the audio, which technically introduces some loss. At a 192 kbps or higher target it is inaudible on normal equipment. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy transcodes are only as good as the target bitrate you choose.
For voice content (podcasts, audiobooks, lectures) 128 kbps is indistinguishable from higher bitrates. For music, 192-256 kbps covers most listening; 320 kbps is the ceiling for OPUS and the right choice for audio you plan to edit further. Above that, prefer a lossless target instead.
Yes. Title, artist, album, year and cover art travel from the WMA container to the OPUS container automatically where both formats support them. If a tag field has no OPUS equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
Windows Media Audio
Source formatWMA is a proprietary Microsoft audio format from the Windows Media framework. Once common in the Windows ecosystem, it has been largely replaced by AAC and MP3 for general use.
Opus Audio
Target formatOpus is a versatile, open-source audio codec optimized for both speech and music at very low bitrates. It is the standard for WebRTC voice calls and excels at real-time communication.
Going the other way? Convert OPUS back to WMA with the same engine.
Common Use Cases
Share across platforms
Send OPUS files to anyone without worrying about whether they have the right software for WMA.
Embed in documents
Drop OPUS output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
OPUS often produces smaller files than WMA for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
WMA vs OPUS — Typical file sizes
Approximate file sizes for common scenarios.
- 3-min song (128 kbps) 3 MB
- 3-min song (Lossless) 25-35 MB
- 1-hour talk (64 kbps) 28 MB
- Voice call (24 kbps) 180 KB/min
- Podcast (48 kbps) 21 MB/hour
- Music (128 kbps) ~1 MB/min
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Related comparisons
See these formats side by side to understand which fits your use case best.
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