---
title: User data atom
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/media_atom/user_data_atom
---

# User data atom

An atom where you define and store data associated with a QuickTime object.

## Overview

Overview For more information, see User data atom ('udta').

## See Also

### Data fields

- [Size](quicktime-file-format/media_atom/size.md)
- [Type](quicktime-file-format/media_atom/type.md)
- [Media header atom](quicktime-file-format/media_atom/media_header_atom.md)
- [Extended language tag atom](quicktime-file-format/media_atom/extended_language_tag_atom.md)
- [Handler reference atom](quicktime-file-format/media_atom/handler_reference_atom.md)
- [Media information atom](quicktime-file-format/media_atom/media_information_atom.md)