Convert OGA to WMA — Free Online Tool
Convert OGA (Ogg Audio) files to WMA (Windows Media Audio) format directly in your browser, transcoding Vorbis or FLAC audio streams into Microsoft's wmav2 codec at 128k bitrate by default. This is useful when you need broad compatibility with Windows Media Player, legacy Windows devices, or Microsoft ecosystem software that doesn't support the open Ogg container.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your OGA 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
OGA files store audio using open codecs — most commonly Vorbis (lossy) or FLAC (lossless) — inside the Ogg container. WMA uses Microsoft's proprietary wmav2 codec inside an ASF (Advanced Systems Format) container, and it is strictly lossy. During this conversion, FFmpeg fully decodes the OGA audio stream — whether it was Vorbis or FLAC — to raw PCM, then re-encodes that PCM audio into wmav2 at the specified bitrate (128k by default). This is a full transcode, not a remux, because the source and destination codecs are entirely different. If your OGA source was lossless FLAC, the output WMA will be lossy, meaning some audio information is permanently discarded. If your source was already lossy Vorbis, you are doing a lossy-to-lossy transcode, which can introduce generation loss, so it's best to use the highest quality source available.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg program, the open-source multimedia processing engine that handles all decoding, encoding, and container remuxing. In the browser version of this tool, FFmpeg runs as a WebAssembly module (FFmpeg.wasm), so no files leave your device. |
-i input.oga
|
Specifies the input file — in this case, an OGA file containing an Ogg-containerized audio stream (typically Vorbis or FLAC). FFmpeg will detect the codec automatically by reading the Ogg stream headers. |
-c:a wmav2
|
Sets the audio codec to wmav2 (Windows Media Audio version 2), Microsoft's standard WMA codec. This instructs FFmpeg to fully decode the OGA audio and re-encode it into the proprietary wmav2 format required by the WMA container. |
-b:a 128k
|
Sets the audio bitrate to 128 kilobits per second for the wmav2 encoder. This is the default balance between file size and audio quality for WMA; increase to 192k or 256k for better fidelity, especially if your source OGA contained lossless FLAC audio. |
output.wma
|
Specifies the output filename with the .wma extension, which tells FFmpeg to wrap the encoded wmav2 audio stream in an ASF (Advanced Systems Format) container — the standard container used by all WMA files and expected by Windows Media Player and other WMA-compatible software. |
Common Use Cases
- Sharing audio files with colleagues or clients who use Windows Media Player, which natively supports WMA but often struggles with OGA/Ogg files out of the box
- Migrating an audio library that was ripped or recorded in OGA format to WMA for playback on older Windows-based portable media players (e.g., certain Zune or Creative devices) that lack Ogg Vorbis support
- Preparing audio content for upload to platforms or enterprise systems built around Microsoft technologies that expect WMA as the input format
- Converting FLAC-encoded OGA archival recordings to a smaller, compressed WMA file for everyday listening when storage is a concern on a Windows device
- Converting spoken-word or podcast recordings stored in OGA to WMA for compatibility with older Windows Phone or Windows CE devices that support WMA but not Ogg
Frequently Asked Questions
Yes, always — WMA (wmav2) is a lossy-only format, so some audio quality is lost regardless of your source. If your OGA file used FLAC (lossless audio), the conversion to WMA at 128k represents a significant quality reduction from a technically perfect source. If your OGA used Vorbis (already lossy), you are doing a lossy-to-lossy transcode, which compounds artifacts from both encoders. Use the highest bitrate WMA setting available (320k) if quality is important.
FFmpeg will attempt to map standard metadata fields — such as title, artist, album, and track number — from the Ogg comment tags in the OGA file to the ASF metadata container used by WMA. Most common tags transfer correctly. However, OGA supports some Vorbis comment fields that have no direct WMA equivalent, and those may be dropped. Chapters, which OGA supports, are not supported by WMA and will be lost entirely.
Replace the value after -b:a in the command. For example, to encode at 192 kbps instead of the default 128k, use: ffmpeg -i input.oga -c:a wmav2 -b:a 192k output.wma. Supported bitrate options include 64k, 96k, 128k, 160k, 192k, 256k, and 320k. Higher bitrates produce better audio quality and larger file sizes, which matters most for music with complex instrumentation or high-frequency content.
Yes. WMA v1 (wmav1) is an older, less efficient codec that was superseded by wmav2. You can use it by changing the codec flag: ffmpeg -i input.oga -c:a wmav1 -b:a 128k output.wma. In practice, wmav2 produces better audio quality at the same bitrate and is supported by virtually everything that supports WMA, so there is rarely a reason to choose wmav1 unless you are targeting a very old device that specifically requires it.
The single-file command shown here handles one file at a time, but you can batch process on your desktop using a shell loop. On Linux or macOS: for f in *.oga; do ffmpeg -i "$f" -c:a wmav2 -b:a 128k "${f%.oga}.wma"; done. On Windows Command Prompt: for %f in (*.oga) do ffmpeg -i "%f" -c:a wmav2 -b:a 128k "%~nf.wma". This is especially useful for large collections that exceed the 1GB browser limit.
WMA (wmav2) and Vorbis are psychoacoustic codecs that each discard audio information differently based on their own models of human hearing. Even when both encode at nominally equivalent bitrates, they introduce different types of artifacts — Vorbis may handle transients differently than wmav2, and vice versa. If your source was FLAC-based OGA, the difference is entirely due to the wmav2 lossy encoding. For archival purposes, always keep your original OGA files.
Technical Notes
OGA is an Ogg container carrying audio-only streams, most often Vorbis or FLAC, and occasionally Opus. WMA uses Microsoft's ASF container with the wmav2 codec, which operates as a transform-based lossy codec similar in concept to AAC or MP3 but with different psychoacoustic characteristics. Because there is no codec overlap between OGA and WMA, FFmpeg must fully decode and re-encode the audio — there is no fast-copy path here. The default bitrate of 128k is a reasonable middle ground for speech and light music, but for high-quality music conversion, 192k or 256k is recommended. Note that WMA does not support chapters (which OGA does), multiple audio tracks, or lossless encoding in the standard wmav2/wmav1 implementations (WMA Lossless is a separate codec not covered here). DRM can theoretically be applied to WMA containers, but FFmpeg does not add DRM. Metadata transfer is generally reliable for core ID3-equivalent fields, but custom or extended Vorbis comment tags may not have a WMA counterpart and will be silently dropped during conversion.