# Leading zeros are not possible with automatic and manual track numbering
**URL:** https://community.mp3tag.de/t/leading-zeros-are-not-possible-with-automatic-and-manual-track-numbering/66532
**Category:** Support
**Created:** [November 16, 2024, 8:53am UTC](https://community.mp3tag.de/t/leading-zeros-are-not-possible-with-automatic-and-manual-track-numbering/66532 "2024-11-16T08:53:42Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@PC\_Maniac](https://community.mp3tag.de/u/PC_Maniac)
#### Post date: [November 16, 2024, 8:53am UTC](https://community.mp3tag.de/t/leading-zeros-are-not-possible-with-automatic-and-manual-track-numbering/66532/1 "2024-11-16T08:53:43Z")
Unfortunately, when you enable the numbering options with a leading zero (01, 02, ... ,05, ...,10), the program switches to the version with single numbering (1, 2, ... ,5, ...10) and you cannot force it to start them with a leading zero.
The same applies to inserting numbering manually - I insert with a leading zero, and the tag cell immediately "corrects" it and changes it to single numbering.
It is also annoying that you cannot find older versions on the download page (because I wanted to go back to the older version because of the bug described above), there are only about 2 very old ones - 305, 239 and 202.
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [November 16, 2024, 8:56am UTC](https://community.mp3tag.de/t/leading-zeros-are-not-possible-with-automatic-and-manual-track-numbering/66532/2 "2024-11-16T08:56:41Z")
What kind of files are these?
MP4?
The mp4 tag format does not allow leading zeros.
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### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [November 16, 2024, 8:56am UTC](https://community.mp3tag.de/t/leading-zeros-are-not-possible-with-automatic-and-manual-track-numbering/66532/3 "2024-11-16T08:56:56Z")
It's unfortunately not possible with the MP4/M4A format. Track numbers are stored as integer values there (basically a number) in the file instead of a numeric string (like "01") as with MP3 or FLAC.
If you want to use leading zeros when renaming files, you can always use `$num(%track%,2)` instead of `%track%`
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [December 16, 2024, 8:57am UTC](https://community.mp3tag.de/t/leading-zeros-are-not-possible-with-automatic-and-manual-track-numbering/66532/4 "2024-12-16T08:57:48Z")
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