# Mp3tag cannot write to mp4 files

**URL:** https://community.mp3tag.de/t/mp3tag-cannot-write-to-mp4-files/68278
**Category:** Support
**Created:** [April 21, 2025, 12:40pm UTC](https://community.mp3tag.de/t/mp3tag-cannot-write-to-mp4-files/68278 "2025-04-21T12:40:56Z")
**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: [April 21, 2025, 12:50pm UTC](https://community.mp3tag.de/t/mp3tag-cannot-write-to-mp4-files/68278/2 "2025-04-21T12:50:21Z")

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See e.g. here:

> [@MP4 files cannot be opened for writing](https://community.mp3tag.de/t/mp4-files-cannot-be-opened-for-writing/49164):
>
> I thought I read that mp3tag works for editing tags on mp4 files. But, I'm getting an error message when adding a new thumbnail to an mp4 video, and it won't allow me to save it.

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_[View the full topic](https://community.mp3tag.de/t/mp3tag-cannot-write-to-mp4-files/68278)._