---
title: QLFileThumbnailRequest
framework: quicklookthumbnailing
role: symbol
role_heading: Class
path: quicklookthumbnailing/qlfilethumbnailrequest
---

# QLFileThumbnailRequest

A request to generate a thumbnail for a custom file type.

## Declaration

```swift
class QLFileThumbnailRequest
```

## Topics

### Describing the Requested Thumbnail

- [maximumSize](quicklookthumbnailing/qlfilethumbnailrequest/maximumsize.md)
- [minimumSize](quicklookthumbnailing/qlfilethumbnailrequest/minimumsize.md)
- [scale](quicklookthumbnailing/qlfilethumbnailrequest/scale.md)
- [fileURL](quicklookthumbnailing/qlfilethumbnailrequest/fileurl.md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Thumbnails for Custom File Types

- [Providing Thumbnails of Your Custom File Types](quicklookthumbnailing/providing-thumbnails-of-your-custom-file-types.md)
- [QLThumbnailProvider](quicklookthumbnailing/qlthumbnailprovider.md)
- [QLThumbnailReply](quicklookthumbnailing/qlthumbnailreply.md)