# How to prevent mp3tag web source from overwriting certain existing tags?
**URL:** https://community.mp3tag.de/t/how-to-prevent-mp3tag-web-source-from-overwriting-certain-existing-tags/64348
**Category:** Mac
**Created:** [April 9, 2024, 10:30am UTC](https://community.mp3tag.de/t/how-to-prevent-mp3tag-web-source-from-overwriting-certain-existing-tags/64348 "2024-04-09T10:30:11Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@pavelle](https://community.mp3tag.de/u/pavelle)
#### Post date: [April 9, 2024, 10:30am UTC](https://community.mp3tag.de/t/how-to-prevent-mp3tag-web-source-from-overwriting-certain-existing-tags/64348/1 "2024-04-09T10:30:11Z")
So here is my standard workflow:
I usually encode wav. or .flac files to .m4a with Apple's build in AAC encoder within macOS. This way it creates two tags: ITUNNORM and ITUNSMPB. After that I use Discogs as the main tag source to tag the rest. However, this way, it overwrites ITUNNORM and ITUNSMPB, which I want to keep. So how do I prevent mp3tag from overwriting these specific tags? Thanks!
**Edit: It seems I found the required option, which is the "merge" option.**
However, does anyone know how to recalculate the missing ITUNNORM and ITUNSMPB now, preferably using the already encoded audio files? If possible as a terminal command?
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### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [April 9, 2024, 11:41am UTC](https://community.mp3tag.de/t/how-to-prevent-mp3tag-web-source-from-overwriting-certain-existing-tags/64348/2 "2024-04-09T11:41:39Z")
Do you use "Mp3tag for Mac" or for Windows?
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### Author:  [@pavelle](https://community.mp3tag.de/u/pavelle)
#### Post date: [April 9, 2024, 11:53am UTC](https://community.mp3tag.de/t/how-to-prevent-mp3tag-web-source-from-overwriting-certain-existing-tags/64348/3 "2024-04-09T11:53:11Z")
Everything on Mac, including audio encoding
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### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [April 9, 2024, 12:01pm UTC](https://community.mp3tag.de/t/how-to-prevent-mp3tag-web-source-from-overwriting-certain-existing-tags/64348/4 "2024-04-09T12:01:10Z")
So please use the matching support category:
> **[Mac](https://community.mp3tag.de/c/mac/32)**
>
> This category is all about Mp3tag for Mac. You can post support questions, suggestions, bug reports, and general feedback related to Mp3tag for Mac here.
I have changed it from "Support (for Windows)" to "Mac" (English) for you.
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [May 9, 2024, 12:01pm UTC](https://community.mp3tag.de/t/how-to-prevent-mp3tag-web-source-from-overwriting-certain-existing-tags/64348/5 "2024-05-09T12:01:26Z")
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