Convert WEBA to WMA — Free Online Tool
Convert WEBA audio files (WebM audio containers with Opus or Vorbis encoding) to WMA format using the wmav2 codec, making your audio compatible with Windows Media Player, legacy Microsoft software, and platforms that require Microsoft's proprietary audio format. The conversion runs entirely in your browser — no upload required.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your WEBA file here
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Free — no uploads, no signups. Your files never leave your browser.
Settings
Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
WEBA files store audio in a WebM container, almost always encoded with the Opus codec (occasionally Vorbis). WMA uses Microsoft's proprietary ASF container with the wmav2 codec. Because these are entirely different codecs and containers with no overlapping stream compatibility, this conversion is a full transcode: the Opus or Vorbis audio stream is fully decoded to raw PCM audio, then re-encoded from scratch using the wmav2 encoder at the target bitrate (default 128k). There is no stream-copying shortcut available here — every sample must be processed. This means some generational quality loss is inevitable since both formats are lossy, so starting from the highest-quality WEBA source available will produce the best WMA output.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg application, the open-source multimedia processing engine that powers this browser-based tool via its WebAssembly (FFmpeg.wasm) build. |
-i input.weba
|
Specifies the input WEBA file. FFmpeg reads the WebM container and detects the enclosed audio stream, which is almost always Opus-encoded, to prepare it for decoding and transcoding. |
-c:a wmav2
|
Instructs FFmpeg to encode the output audio stream using the wmav2 codec — Microsoft's second-generation Windows Media Audio encoder, which produces the standard .wma file format compatible with Windows Media Player and most WMA-capable devices. |
-b:a 128k
|
Sets the audio output bitrate to 128 kilobits per second for the wmav2 encoder. This is a balanced default for WMA that delivers reasonable audio fidelity comparable to the original WEBA source at the same bitrate, without inflating the file size. |
output.wma
|
Defines the output filename with the .wma extension, which tells FFmpeg to wrap the wmav2-encoded audio in Microsoft's ASF container — the standard packaging required for WMA files. |
Common Use Cases
- Making web-sourced audio clips compatible with Windows Media Player or older Windows applications that do not support WebM or Opus playback
- Preparing audio files for distribution through Microsoft-centric enterprise systems or intranets that mandate WMA as the standard audio format
- Converting browser-recorded WEBA audio (e.g., from a web app or recorder) into WMA so it can be embedded in legacy PowerPoint presentations or Windows Movie Maker projects
- Archiving or organizing a media library that must conform to WMA for compatibility with older portable audio players, car stereos, or Windows CE devices that predate Opus support
- Converting WEBA podcast drafts or voice memos to WMA for submission to a content management system that only accepts Microsoft audio formats
- Obtaining the exact FFmpeg command to batch-transcode a large folder of WEBA files to WMA locally on a Windows workstation, particularly when files exceed 1GB
Frequently Asked Questions
Yes, some quality loss is unavoidable because both Opus and wmav2 are lossy codecs, and transcoding between them requires a full decode-then-re-encode cycle. At matching bitrates like 128k, the difference is usually subtle for speech and moderate music, but Opus is technically a more efficient codec than wmav2, meaning a 128k Opus source converted to 128k WMA may sound slightly less detailed than the original. To minimize loss, use the highest bitrate your WEBA source was encoded at and choose an equal or higher WMA output bitrate.
They overlap significantly but not identically. WEBA with Opus supports bitrates from 64k to 320k, while WMA (wmav2) supports 64k, 96k, 128k, 160k, 192k, 256k, and 320k. Notably, WMA adds a 160k option that is absent in the WEBA presets on this tool. Both formats share the most common bitrates (128k, 192k, 256k, 320k), so you can generally match your source quality when selecting an output bitrate.
wmav2 is the second-generation Windows Media Audio codec and offers better audio quality than wmav1 at the same bitrate, along with broader compatibility across modern Windows applications and devices. wmav1 is largely obsolete and only necessary for very old Windows CE or early Windows Media Player environments. Unless you have a specific legacy device that only reads wmav1, wmav2 is always the correct choice.
Basic metadata tags (title, artist, album, track number) stored in the WEBA/WebM container will typically be read by FFmpeg and written into the WMA output's ASF container automatically during conversion. However, WEBA files sourced from browsers or web recorders often contain little or no embedded metadata, so the WMA output may also be sparse. If your WEBA file has Vorbis comment tags, most standard fields will map correctly to WMA's ASF tag equivalents.
Replace the value after -b:a in the command with your desired bitrate. For example, to encode at 192 kbps, use: ffmpeg -i input.weba -c:a wmav2 -b:a 192k output.wma. WMA (wmav2) works well at 128k for general listening and 192k or higher for music where quality is a priority. Avoid going below 96k as wmav2 at very low bitrates can introduce noticeable artifacts.
Yes. On Linux or macOS, use a shell loop: for f in *.weba; do ffmpeg -i "$f" -c:a wmav2 -b:a 128k "${f%.weba}.wma"; done. On Windows Command Prompt, use: for %f in (*.weba) do ffmpeg -i "%f" -c:a wmav2 -b:a 128k "%~nf.wma". This is particularly useful for large collections exceeding the browser tool's 1GB per-file limit, allowing you to process everything locally with consistent settings.
Technical Notes
WEBA is an audio-only subset of the WebM container format (based on Matroska) and almost universally contains Opus-encoded audio, though older files may use Vorbis. WMA uses Microsoft's Advanced Systems Format (ASF) container, which is proprietary and incompatible with open-source container standards. Because wmav2 is a proprietary codec, FFmpeg must include the built-in wmav2 encoder (which it does by default — no external library is needed). The wmav2 encoder does not support variable bitrate (VBR) in the same flexible way Opus does, so the -b:a flag targets a constant or near-constant bitrate. WEBA's special -vn flag (no video) is not required in this output command since WMA inherently has no video track. One notable limitation: WMA does not support multichannel audio layouts beyond stereo in wmav2 — if your WEBA source somehow contains surround audio, the output will be downmixed. DRM features present in the WMA specification are not applied by FFmpeg and are not relevant to this conversion. File sizes for WMA at 128k will be comparable to WEBA at 128k, though WMA's ASF container has slightly more overhead than WebM.