# Track Number Format, Padding with 0

**URL:** https://community.mp3tag.de/t/track-number-format-padding-with-0/66696
**Category:** Support
**Created:** [December 2, 2024, 3:42am UTC](https://community.mp3tag.de/t/track-number-format-padding-with-0/66696 "2024-12-02T03:42:09Z")
**Posts on this page:** 1
**Showing post:** 2

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### 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: [December 2, 2024, 6:01am UTC](https://community.mp3tag.de/t/track-number-format-padding-with-0/66696/2 "2024-12-02T06:01:24Z")

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> [@Whitburn\_Collector](#):
>
> the one that was updated to track number "05" was an mp4 file, the other two that didn't update as expected were m4v files

AFAIK the mp4 tag format does not support leading zeros at all. So check what is wrong with the mp4 file.

> [@Whitburn\_Collector](#):
>
> not padding track numbers 1-9

Yes, this is always the case.  
If you really want leading zeros, then, after you have assigned the correct ascending number, use an action of the type "Format value" for TRACK  
Format string: `$num(%track%,2)`  
this works only on files with the total number of tracks saved in TRACK.

See also here:

> [@In mp3tag v.3.27a, I can no longer enter track numbers in format xx/xx e.g. 04/10](https://community.mp3tag.de/t/in-mp3tag-v-3-27a-i-can-no-longer-enter-track-numbers-in-format-xx-xx-e-g-04-10/66685):
>
> In mp3tag v.3.27a, I can no longer enter track numbers in format xx/xx e.g. 04/10. I used to be able to enter track numbers of the type XX/XX e.g. 04/10, but in the update to mp3tag v.3.27a, I can no longer do this. I have tried using the auto-numbering wizard, tried entering a leading zero to the digit e.g. 04, but nothing works for me. It used to happen automatically- I just used to enter my track field with the format xx/xx e.g. 04/10 without any problems, but I can't do it since the updat…

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