---
title: "QLThumbnailCopyDocumentURL(_:)"
framework: quicklook
role: symbol
role_heading: Function
path: "quicklook/qlthumbnailcopydocumenturl(_:)"
---

# QLThumbnailCopyDocumentURL(_:)

Returns the URL of the document that you’re requesting a thumbnail for.

## Declaration

```swift
func QLThumbnailCopyDocumentURL(_ thumbnail: QLThumbnail!) -> Unmanaged<CFURL>!
```

## Parameters

- `thumbnail`: The thumbnail to compute.

## Return Value

Return Value The URL of the document that you’re requesting a thumbnail for.

## See Also

### Creating thumbnails

- [QLThumbnailImageCreate(_:_:_:_:)](quicklook/qlthumbnailimagecreate(_:_:_:_:).md)
- [QLThumbnailCreate(_:_:_:_:)](quicklook/qlthumbnailcreate(_:_:_:_:).md)
- [QLThumbnailDispatchAsync(_:_:_:)](quicklook/qlthumbnaildispatchasync(_:_:_:).md)
- [QLThumbnailCancel(_:)](quicklook/qlthumbnailcancel(_:).md)
- [QLThumbnailCopyImage(_:)](quicklook/qlthumbnailcopyimage(_:).md)
- [QLThumbnailCopyOptions(_:)](quicklook/qlthumbnailcopyoptions(_:).md)
- [QLThumbnailGetContentRect(_:)](quicklook/qlthumbnailgetcontentrect(_:).md)
- [QLThumbnailGetMaximumSize(_:)](quicklook/qlthumbnailgetmaximumsize(_:).md)
- [QLThumbnailGetTypeID()](quicklook/qlthumbnailgettypeid().md)
- [QLThumbnailIsCancelled(_:)](quicklook/qlthumbnailiscancelled(_:).md)