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Why audio metadata disappears between formats
Metadata systems differ by container. A field copied from ID3 may not have an exact equivalent in Vorbis comments or MP4 atoms.
Reviewed against current browser behavior and AudioFetcher test fixtures on July 28, 2026.
Key facts
MP3 commonly uses ID3.
FLAC and OGG commonly use Vorbis comments.
MP4/M4A uses atoms.
WAV metadata support varies substantially by application.
Practical decisions
- Check tags after conversion.
- Keep a separate library database when metadata is mission-critical.
Measure the source before changing it. Codec, container, duration, channels, and intended playback environment are more useful than choosing a setting from its label alone.
Questions about Why audio metadata disappears between formats
What is the short answer to "Why audio metadata disappears between formats"?
Metadata systems differ by container. A field copied from ID3 may not have an exact equivalent in Vorbis comments or MP4 atoms.
Does the linked AudioFetcher tool upload my media?
The local tools linked from this article process selected media in the browser. Read each tool's limits before using a large or uncommon file.
What is the most important practical point?
Check tags after conversion.