---
title: Size
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/metadata_key_declaration_atom/size
---

# Size

A 32-bit unsigned integer that indicates the size in bytes of the atom structure.

## See Also

### Data fields

- [Type](quicktime-file-format/metadata_key_declaration_atom/type.md)
- [Key_namespace](quicktime-file-format/metadata_key_declaration_atom/key_namespace.md)
- [Key_value array](quicktime-file-format/metadata_key_declaration_atom/key_value_array.md)