# Tag window cannot be filled in **URL:** https://community.mp3tag.de/t/tag-window-cannot-be-filled-in/57978 **Category:** Support **Created:** [July 23, 2022, 12:53am UTC](https://community.mp3tag.de/t/tag-window-cannot-be-filled-in/57978 "2022-07-23T00:53:13Z") **Posts on this page:** 1 **Showing post:** 2
### Author: ![poster](https://community.mp3tag.de/user_avatar/community.mp3tag.de/poster/32/4881_2.png) [@poster](https://community.mp3tag.de/u/poster) #### Post date: [July 23, 2022, 4:04am UTC](https://community.mp3tag.de/t/tag-window-cannot-be-filled-in/57978/2 "2022-07-23T04:04:40Z")
The length and bitrate of an MP3 file are not user-editable fields. Rather, they are calculated by Mp3Tag or taken from the file header. These fields are information fields in Mp3Tag. The fields in Mp3Tag are `_LENGTH` and \_`BITRATE` and are not offered in the extended editing dialog. So if you use the editable field LENGTH (without underscore) it is not the normally used information field \_LENGTH. If you look at the field with the heading Length in the configuration of the column view, you will notice that the field \_LENGTH is behind it. There is also the possibility in Mp3Tag to create an editable field `LENGTH`. However, this is not equivalent to the `_LENGTH` field used in the column view and is not displayed there either. However, your problem with individual files indicates that the corresponding files are corrupt or not real MP3 files. So you should check them with the usual test programs. > [@How to check files for errors?](https://community.mp3tag.de/t/how-to-check-files-for-errors/44633): > > It’s required and often helps to reduce support cycles to check files for errors before filing a bug report. Symptoms of erroneous files are often missing or wrong bitrate or length audible blips or skips tags seem to be sticky and cannot be removed There are some really good tools to check the files for errors, namely MP3 Diags — identifies many different issues in MP3 files Website: [http://mp3diags.sourceforge.net](http://mp3diags.sourceforge.net) Download: [MP3 Diags - Getting MP3 Diags](http://mp3diags.sourceforge.net/010_getting_the_program.html#binWindows) If the font size in MP3 Diags is … --- _[View the full topic](https://community.mp3tag.de/t/tag-window-cannot-be-filled-in/57978)._