# QLThumbnailCopyDocumentURL(_:) Returns the URL of the document that you’re requesting a thumbnail for. ``` func QLThumbnailCopyDocumentURL(_ thumbnail: QLThumbnail!) -> Unmanaged! ``` ## Parameters `thumbnail` The thumbnail to compute. ## Return Value The URL of the document that you’re requesting a thumbnail for. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)