---
title: thumbnailKey
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/urlresourcekey/thumbnailkey
---

# thumbnailKey

All thumbnails as a single NSImage (read-write).

## Declaration

```swift
static let thumbnailKey: URLResourceKey
```

## See Also

### Thumbnail keys

- [thumbnailDictionaryKey](foundation/urlresourcekey/thumbnaildictionarykey.md)
- [URLThumbnailDictionaryItem](foundation/urlthumbnaildictionaryitem.md)