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NTag vs Kid3: catalog facts
NTag	Kid3
Free Free and open source under the GPL-3.0.	Free Free and open source. Hosting, hardware and any external services are separate.
Windows, Linux	Windows, macOS, Linux, Android
Batch editing across many files Supports MP3, M4A, M4B, FLAC, OGG and WMA	Supports multiple audio tag formats Can rename files using tag information
Fewer automation features than larger taggers Small project with a modest user base	Tagging changes metadata rather than repairing the audio itself.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.