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# QLThumbnailProvider

An abstract base class for creating thumbnails of custom file types.

```
class QLThumbnailProvider
```

## Topics

### Essentials

[`-  provideThumbnailForFileRequest:completionHandler:`](/documentation/QuickLookThumbnailing/QLThumbnailProvider/provideThumbnail(for:_:))

Creates a thumbnail of a custom file type for a specific request.

## Relationships

### Conforms To

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`Equatable`](/documentation/Swift/Equatable)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`Hashable`](/documentation/Swift/Hashable)

[`CVarArg`](/documentation/Swift/CVarArg)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

---

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