# Change a name in MP3
**URL:** https://community.mp3tag.de/t/change-a-name-in-mp3/46295
**Category:** General Discussion
**Created:** [August 31, 2019, 1:13pm UTC](https://community.mp3tag.de/t/change-a-name-in-mp3/46295 "2019-08-31T13:13:08Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Strid](https://community.mp3tag.de/u/Strid)
#### Post date: [August 31, 2019, 1:13pm UTC](https://community.mp3tag.de/t/change-a-name-in-mp3/46295/1 "2019-08-31T13:13:08Z")
Hello! I got files and i want them only to be converted to a string that is like this %artist% - %title% The problem is when i mark the file name and it is blue i press convert and alt + f2 and type %artist% - %Title% Then it what me to define a conversion pattern ??? It did work with my first track but now the ok button is grey ? What am i doing wrong ? anyone who knows ? /Thanks
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### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [August 31, 2019, 1:43pm UTC](https://community.mp3tag.de/t/change-a-name-in-mp3/46295/2 "2019-08-31T13:43:13Z")
You want to rename your filenames according to your existing tags?
> [@Converters to rename files or to import tags](https://community.mp3tag.de/t/converter/8016/2):
>
> How to rename files based on tags? Renaming files, creating folders and complete directory structures from tags can be done by using the [:mt\_ttf:] Converter \> Tag - Filename with a format string. A format string is used to describe the structure of the desired filename. Besides using normal placeholders (such as %artist%, %title%, ...) and arbitrary text (e.g., Music) it also allows for separating folders with the backslash \ character. Here is an example that renames the file based on the t…
Your conversion pattern has to match your existing metadata.
You can only rename your mp3 to `%artist% - %title%` if both metadata tags `%artist%` and `%title%` are filled with data.
It the OK button remains grey, the converter isn't able to find your tag data and therefore isn't able to rename your mp3.
You could show us the tags for your "grey track" (pressing ALT + T).