# Convert the name of mp3 with capital letters on macOS **URL:** \ **Category:** Support\ **Created:** [April 30, 2019, 12:02am UTC](https://community.mp3tag.de/t/convert-the-name-of-mp3-with-capital-letters-on-macos/45294 "2019-04-30T00:02:34Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Jacinto](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/j/6bbea6/32.png) [@Jacinto](https://community.mp3tag.de/u/Jacinto)\ **Post date:** [April 30, 2019, 12:02am UTC](https://community.mp3tag.de/t/convert-the-name-of-mp3-with-capital-letters-on-macos/45294/1 "2019-04-30T00:02:34Z")
CONVERT THE NAME OF MP3 WITH CAPITAL LETTERS. I get an error when wanting to change the names of my mp3s to capital letters. Help does not allow me. My operating system is Mac Os Hit Sierra ![43](https://community.mp3tag.de/uploads/default/original/2X/f/f745e183596c37d765f3117248c007ad53ced7fb.png) ---
**Author:** ![Florian](https://community.mp3tag.de/user_avatar/community.mp3tag.de/florian/32/5759_2.png) [@Florian](https://community.mp3tag.de/u/Florian)\ **Post date:** [April 30, 2019, 4:14am UTC](https://community.mp3tag.de/t/convert-the-name-of-mp3-with-capital-letters-on-macos/45294/2 "2019-04-30T04:14:53Z")
It's a limitation of the Wine-based macOS version: case conversion needs to use a temporary filename, so that the system doesn't think that it's overwriting an existing file. A workaround for this is to add a temporary underscore via the converter "Tag - Tag" for field `_FILENAME` first with `$caps(%_filename%)_` as format string and then again, to remove the temporary underscore, with `$trimRight(%_filename%,'_')` as format string. ---
**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\ **Post date:** [February 9, 2026, 12:28pm UTC](https://community.mp3tag.de/t/convert-the-name-of-mp3-with-capital-letters-on-macos/45294/3 "2026-02-09T12:28:04Z")