How to Convert WMA to FLAC
Windows Media Audio (WMA) was Microsoft's answer to MP3 — and millions of people built large music libraries in it during the 2000s. Converting those WMA files to FLAC gives you a future-proof lossless archive that plays on every platform. Here is how to rescue your old Windows library the right way.
Why Archiving WMA to FLAC Is the Right Move
WMA is a proprietary Microsoft format with dwindling support. Apple devices have never supported it natively. Linux support is limited. Modern Android phones often struggle with WMA playback. Microsoft itself deprecated WMA in favor of AAC and MP3 for consumer use. If your WMA files are standard (non-DRM) WMA at 128 kbps or higher, converting to FLAC creates a lossless container around the decoded audio. While the audio data itself remains at whatever quality the WMA encoder originally produced, FLAC ensures no further quality loss ever occurs. FLAC files play on every modern platform, work in every DAW, and will remain playable for the foreseeable future regardless of Microsoft's product decisions.
Standard WMA vs. WMA Lossless
Most WMA files from the 2000s are standard WMA — a lossy format comparable to MP3. If you ripped CDs using Windows Media Player's default settings in Windows XP or Vista, your files are probably 128 kbps WMA. WMA Lossless (WMAL) is a separate lossless codec that Microsoft introduced later — these files contain CD-quality audio and are worth converting to FLAC carefully to avoid any quality loss. To identify which you have: check the file's properties. A WMA file with a bitrate of 600 kbps or higher is likely WMA Lossless. Standard WMA runs from 64 kbps to 320 kbps. DRM-protected WMA files (purchased from the old Windows Media Store) cannot be converted without unlocking — the DRM must be removed first, which requires specific software and may have legal implications depending on your jurisdiction.
Step-by-Step: WMA to FLAC on AudioUtils
Open AudioUtils in your browser. Drag your WMA file onto the converter. AudioUtils supports WMA via the WebAssembly FFmpeg engine, which handles standard WMA, WMA Pro, and WMA Lossless. Select FLAC as the output format. FLAC has a compression level setting from 0 (fastest, largest) to 8 (slowest, smallest) — for archival purposes, level 5 (the default) is the best balance. The audio quality is identical at all compression levels; only file size and encoding speed vary. Click convert and download the FLAC file. Play it back and compare to the original WMA to verify no issues occurred during conversion. For large libraries, use the Pro tier and process files in sequence.
Verifying Conversion Quality
After converting a WMA to FLAC, the most important verification is auditory: play both files and confirm they sound identical. A few specific things to check: the beginning and end of the file for any truncation, consistent volume (WMA replay gain tags may differ from FLAC replay gain), and the full frequency range. FLAC supports embedded metadata tags — the WMA ID3 information (title, artist, album, year, genre) should transfer automatically. Verify tags using a metadata editor like fre:ac, Mp3tag, or Kid3. If tags did not transfer, add them manually before archiving. File size should be larger than the original WMA if converting from standard WMA — FLAC stores uncompressed audio, so a 5 MB WMA at 128 kbps becomes approximately 35 MB FLAC.
What to Do After Archiving to FLAC
Once you have FLAC archives, you have options. Store the FLAC files on a NAS, external drive, or cloud service as your lossless archive. From FLAC, convert to MP3 or AAC for your portable player or phone. Convert to WAV or AIFF if you need to use the audio in a DAW. FLAC files import directly into Plex, Jellyfin, and Kodi for home media server streaming. MusicBrainz Picard can automatically tag your FLAC library by identifying songs from audio fingerprints — useful if your old WMA tags were incomplete or incorrect. Backing up the FLAC archive in two separate locations (local and cloud) protects against drive failure. The FLAC archive is now your permanent master; the WMA originals can be deleted once verified.