---
title: "User data atom ('udta')"
framework: quicktime-file-format
role: symbol
role_heading: Atom
path: quicktime-file-format/user_data_atom
---

# User data atom ('udta')

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

## Overview

Overview The layout of a user data atom is as follows.  |   |   |   |

## Topics

### Data fields

- [Size](quicktime-file-format/user_data_atom/size.md)
- [Type](quicktime-file-format/user_data_atom/type.md)
- [User data list](quicktime-file-format/user_data_atom/user_data_list.md)

## See Also

### Atoms for user data

- [Track name atom ('tnam')](quicktime-file-format/track_name_atom.md)
- [Print to video atom ('ptv ')](quicktime-file-format/print_to_video_atom.md)