Batch Audio File Renamer: Rename MP3 Files from ID3 Tags

The engine takes the artist and the title the analysis read from ID3, Vorbis or MP4 tags and proposes "Artist - Title.ext". When only one of the two fields exists the row stays at low confidence with an explicit note, and when neither holds a usable value the track goes to the unresolvable bucket instead of getting an invented name.

• Artist and title come from a local tag read, never from an online lookup.
• Junk values such as "Untitled", "www.…" or "320 kbps" are refused instead of becoming a name.

Illegal characters become a space ("AC/DC" turns into "AC DC"), whitespace runs collapse, trailing dots and spaces are stripped, Windows device names such as CON get an underscore prefix and the result is cut to 255 UTF-8 bytes on code-point boundaries — the strictest of the NTFS, ext4 and APFS budgets.

• The extension is preserved byte for byte, case included.
• A name that would end up empty falls back to "track", and an illegal name is fixed at high confidence.

Two tracks resolving to the same target are both listed as conflicts with a deterministic " (2)", " (3)"… suffix checked against every other name the plan leaves on disk, so no script can overwrite a file. The check compares file names only, so two identically named files in different folders are reported as well.

• No proposal ever lands on a name another file keeps.
• Conflicts are surfaced for review, never resolved silently.

Every proposed name is a text field you can rewrite right inside the table, with a reset button back to the suggestion, and the plan regenerates with your edits. One click downloads rename-files.ps1 for Windows, rename-files.sh for macOS and Linux, rename-map.csv for review and README-undo.txt with the reversal steps.

• The script creates rename-undo.csv before renaming anything and refuses to run if it cannot write it.
• A name containing a line break or a NUL is left out of the bundle and listed in the README.