Put your ISRC codes into your audio files.
Free for Mac. Writes ISRC codes into WAV, AIFF, MP3, FLAC and M4A files and never changes the audio.
Free · no account · no telemetry · macOS 13+, Apple silicon
Made for one job.
Five formats
WAV, AIFF, MP3, FLAC and M4A (AAC or ALAC).
Drop in, write out
Drag in files or whole folders. See each file's format and current ISRC.
Number a release
Enter country, registrant, year and a first number. Codes count up in list order.
Validated as you type
Invalid codes are flagged, and so is any code used twice in the list.
Verified before replacing
Written to a copy, read back, and swapped in only if the audio matches.
Everything else stays
Titles, artists and artwork stay as they are. Only the ISRC changes.
No trial, no license key. Free for everyone.
- No account
- No telemetry
- Signed and notarized
- macOS 13+, Apple silicon
Good to know.
Does it change my audio?
No. Only the metadata changes. TAGINDX compares a checksum of the audio before and after, and keeps your original if anything differs.
Can I undo it?
Tick "Keep a backup copy of each file" and the original stays in the same folder as "Name (original)". An ISRC can also be removed again.
Does my audio or usage data go anywhere?
No. There is no account and no telemetry, and your files stay on your Mac.
What is an ISRC, and where do I get codes?
A 12-character code that identifies one recording, such as FI-ABC-26-00001. Your national ISRC agency gives you a registrant code, and your distributor can assign codes for you. TAGINDX does not issue them, it writes the ones you have.
Which files does it not handle?
Version 1 does not handle RF64/BW64 WAV files, Ogg/Opus or ID3v2.2 tags. Such files are left as they were.
