# Tag - Filename format string help
**URL:** https://community.mp3tag.de/t/tag-filename-format-string-help/13849
**Category:** Support
**Created:** [September 7, 2012, 12:23pm UTC](https://community.mp3tag.de/t/tag-filename-format-string-help/13849 "2012-09-07T12:23:22Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Parnodna](https://community.mp3tag.de/u/Parnodna)
#### Post date: [September 7, 2012, 12:23pm UTC](https://community.mp3tag.de/t/tag-filename-format-string-help/13849/1 "2012-09-07T12:23:22Z")
Hi, just discovered this great tool earlier today.
I am trying to come up with a format string for Tag - Filename, but being a bit slow I can't figure out exactly how to do what I want.
Basically, what I want is for the filename to be 01 Blabla.mp3 if there is no discnumber, but if there is for example discnumber 1 tag I want the filename to be 101 Blabla.mp3.
What I've got so far is
$num(%discnumber%,)$num(%track%,2) %title%
Now I am guessing I have to use the if(x,y,z) and maybe some other functions, but I can't quite figure out how!
Any help would be greatly appreciated!
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### Author:  [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [September 7, 2012, 1:08pm UTC](https://community.mp3tag.de/t/tag-filename-format-string-help/13849/2 "2012-09-07T13:08:56Z")
[$num(%discnumber%,1)]$num(%track%,2) %title%
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### Author:  [@Parnodna](https://community.mp3tag.de/u/Parnodna)
#### Post date: [September 7, 2012, 1:14pm UTC](https://community.mp3tag.de/t/tag-filename-format-string-help/13849/3 "2012-09-07T13:14:24Z")
Thanks, worked like a charm!
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:24pm UTC](https://community.mp3tag.de/t/tag-filename-format-string-help/13849/4 "2026-02-09T12:24:02Z")