# help with converting tag\>filename
**URL:** https://community.mp3tag.de/t/help-with-converting-tag-filename/3419
**Category:** Support
**Created:** [June 6, 2006, 6:42pm UTC](https://community.mp3tag.de/t/help-with-converting-tag-filename/3419 "2006-06-06T18:42:05Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@theVoosh](https://community.mp3tag.de/u/theVoosh)
#### Post date: [June 6, 2006, 6:42pm UTC](https://community.mp3tag.de/t/help-with-converting-tag-filename/3419/1 "2006-06-06T18:42:05Z")
Hello. I'm currently using Mp3tag to convert my filenames to something uniform (I like them all to be in the format of "artist name - 01. song name".
My tracknumbers do NOT have leading 0's in the %track% field, and I'd like to keep it that way, but when i convert, I want them to have the leading 0's. I'm currently using this:
$validate($lower(%artist%) - %track%. $lower(%title%),\_)
How could I make it add a leading 0 If it's not a 2 digit number? Any help would be great -- thanks.
---
### Author:  [@Sebastian\_Mares](https://community.mp3tag.de/u/Sebastian_Mares)
#### Post date: [June 6, 2006, 7:07pm UTC](https://community.mp3tag.de/t/help-with-converting-tag-filename/3419/2 "2006-06-06T19:07:55Z")
**$num(%track%,2)**
Please read the help file and / or use the search feature next time. 🙂
---
### Author:  [@theVoosh](https://community.mp3tag.de/u/theVoosh)
#### Post date: [June 6, 2006, 7:57pm UTC](https://community.mp3tag.de/t/help-with-converting-tag-filename/3419/3 "2006-06-06T19:57:18Z")
thanks
---
### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:19pm UTC](https://community.mp3tag.de/t/help-with-converting-tag-filename/3419/4 "2026-02-09T12:19:46Z")