# File smaller after saving with Mp3tag

**URL:** https://community.mp3tag.de/t/file-smaller-after-saving-with-mp3tag/13078
**Category:** General Discussion
**Created:** [February 10, 2012, 11:57am UTC](https://community.mp3tag.de/t/file-smaller-after-saving-with-mp3tag/13078 "2012-02-10T11:57:52Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![JustForMyMemory](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JustForMyMemory](https://community.mp3tag.de/u/JustForMyMemory)
#### Post date: [February 10, 2012, 11:57am UTC](https://community.mp3tag.de/t/file-smaller-after-saving-with-mp3tag/13078/1 "2012-02-10T11:57:52Z")

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![](http://www.freeimagehosting.net/newuploads/bb7fe.png)

My original MP4 audio file size is 7626KB.  
After saving with Mp3tag, with no changes made to file, file size is decreased to 7184KB (loss 442KB, which is pretty big for an audio file).

Can you explain what was lost in 442KB after saving with Mp3tag?  
In the future releases, could Mp3tag keep the file original (with no loss of size) after saving with it?

P/S:

- This happens with every MP4 audio file
- With some other tag editors, MP4 file is still original (7626KB)

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### Author: ![dano](https://community.mp3tag.de/user_avatar/community.mp3tag.de/dano/32/6_2.png) [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [February 10, 2012, 12:27pm UTC](https://community.mp3tag.de/t/file-smaller-after-saving-with-mp3tag/13078/2 "2012-02-10T12:27:47Z")

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How was this file created?  
iTunes files seem to have some big free atoms that are completely empty and Mp3tag removes them

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### Author: ![JustForMyMemory](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JustForMyMemory](https://community.mp3tag.de/u/JustForMyMemory)
#### Post date: [February 10, 2012, 12:35pm UTC](https://community.mp3tag.de/t/file-smaller-after-saving-with-mp3tag/13078/3 "2012-02-10T12:35:13Z")

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> [@dano](#):
>
> How was this file created?

[Meet the Robinsons - Little Wonders.m4a](http://www.mediafire.com/?omknmzymjjj)

You can try this with every other MP4 audio file; and everytime, after saving with Mp3tag, there is a big loss in file size.

> [@dano](#):
>
> iTunes files seem to have some big free atoms that are completely empty and Mp3tag removes them

And Mp3tag shouldn't if user didn't specify it to do so.

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### Author: ![dano](https://community.mp3tag.de/user_avatar/community.mp3tag.de/dano/32/6_2.png) [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [February 10, 2012, 12:42pm UTC](https://community.mp3tag.de/t/file-smaller-after-saving-with-mp3tag/13078/4 "2012-02-10T12:42:50Z")

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Only empty space (padding) is removed. The files are about 5% bigger than needed.  
I don't think there will be an option for that.

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<div class="post-metadata">

### Author: ![JustForMyMemory](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/j/839c29/32.png) [@JustForMyMemory](https://community.mp3tag.de/u/JustForMyMemory)
#### Post date: [February 10, 2012, 12:55pm UTC](https://community.mp3tag.de/t/file-smaller-after-saving-with-mp3tag/13078/5 "2012-02-10T12:55:02Z")

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Again, I think there SHOULD be an option for Mp3tag to keep or delete that. Myself wanted it to be kept, and some may want to delete it.

😆