# Does Bulk Conversion Tag to Filename rewrite unchanged Filenames? **URL:** \ **Category:** Support\ **Created:** [August 16, 2020, 4:22pm UTC](https://community.mp3tag.de/t/does-bulk-conversion-tag-to-filename-rewrite-unchanged-filenames/49923 "2020-08-16T16:22:49Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Davy](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/d/e495f1/32.png) [@Davy](https://community.mp3tag.de/u/Davy)\ **Post date:** [August 16, 2020, 4:22pm UTC](https://community.mp3tag.de/t/does-bulk-conversion-tag-to-filename-rewrite-unchanged-filenames/49923/1 "2020-08-16T16:22:49Z")
A year ago I was so blown away by mp3Tag that I converted 3000 mp3 filenames using tag information. During the intervening period I have cleaned up the tags on about 10% of these tracks. So I would now like to regenerate file names for these changed tracks. Do I have to do it for all 3000 tracks or will mp3Tag not attempt to change the filenames of the 90% unchanged files? If it changes all then my mirroring backup software will go into overdrive! ---
**Author:** ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)\ **Post date:** [August 16, 2020, 4:31pm UTC](https://community.mp3tag.de/t/does-bulk-conversion-tag-to-filename-rewrite-unchanged-filenames/49923/2 "2020-08-16T16:31:24Z")
You could filter for or sort by files that have been modified after a certain date. In general: MP3tag does not compare the before and after. ---
**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/does-bulk-conversion-tag-to-filename-rewrite-unchanged-filenames/49923/3 "2026-02-09T12:28:46Z")