Free online WMA to BWF converter

Source format: WMA

WMA stands for Windows Media Audio, an audio format developed by Microsoft. It is commonly used for music downloads, archived audio, and older Windows-based media libraries. WMA files may be lossy or, less commonly, lossless, and they are often associated with Windows Media Player and other Microsoft-compatible playback tools.

Because WMA is a compressed audio format, it is mainly used to store audio efficiently while keeping file sizes relatively small. It is not as universally supported as MP3 or WAV, but it remains present in legacy collections and some Windows workflows.

Target format: BWF

BWF means Broadcast Wave Format, a professional audio file format based on WAV. It is widely used in broadcasting, film production, archiving, and other audio workflows that need reliable, uncompressed audio with embedded metadata.

The main advantage of BWF is that it preserves audio as PCM data in a standard WAV-compatible container while adding metadata such as time reference, originator information, and production notes. This makes it especially useful for post-production and long-term storage where compatibility and metadata matter more than small file size.

How to perform the conversion

The most practical way to convert WMA to BWF is to use a desktop audio tool that can export Broadcast Wave or standard WAV with BWF metadata support. A reliable option is FFmpeg, which can decode WMA and write WAV/BWF-compatible output. If you need metadata fields specific to broadcast workflows, dedicated audio editors such as Adobe Audition, Reaper, or Wavelab may be more convenient.

With FFmpeg, the basic conversion is straightforward:

ffmpeg -i input.wma -c:a pcm_s24le output.bwf

This creates an uncompressed PCM audio file suitable for BWF-style use. In many cases, the file extension may be .wav even when the content is BWF-compatible, because BWF is a WAV-based standard. If your workflow specifically requires BWF metadata, use software that can write those fields explicitly.

In a desktop editor, the process is usually:

1. Open the .wma file.
2. Choose File → Save As or File → Export.
3. Select Broadcast Wave, BWF, or WAV with broadcast metadata options.
4. Set the sample rate and bit depth required by your project.
5. Save the new file.

You can also convert the file on 101convert.com for free, without installing any software.

Quality, compatibility, and limitations

The main limitation of this conversion is that WMA is compressed, so converting it to BWF does not restore lost audio detail. The output will be uncompressed and easier to edit, but its quality cannot exceed the source recording.

Another important point is that BWF is typically much larger than WMA because it stores PCM audio. This is normal and expected. If the source WMA uses a low bitrate, the resulting BWF file will still contain the same compressed-source artifacts, just in a larger uncompressed container.

Compatibility is generally excellent for BWF in professional audio software, but some players may simply treat it as a standard WAV file. If metadata is important, verify that the destination application preserves BWF chunks such as timecode and originator data. For archival or production use, choose a sample rate and bit depth that match the original material or your project standard to avoid unnecessary resampling.