# Free PDF.js Express Viewer keys Watermark

**URL:** <https://pdfjs.community/t/free-pdf-js-express-viewer-keys-watermark/2292>\
**Category:** Technical Support\
**Created:** [January 11, 2023, 7:01pm UTC](https://pdfjs.community/t/free-pdf-js-express-viewer-keys-watermark/2292 "2023-01-11T19:01:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![suporte](https://avatars.discourse-cdn.com/v4/letter/s/65b543/32.png) [@suporte](https://pdfjs.community/u/suporte)\
**Post date:** [January 11, 2023, 7:01pm UTC](https://pdfjs.community/t/free-pdf-js-express-viewer-keys-watermark/2292/1 "2023-01-11T19:01:49Z")

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Hi folks, does Free PDF.js Express Viewer keys leaves PDFJS watermark on the documents?  
What should we do to remove the pdfjs watermark?

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<div class="post-metadata">

**Author:** ![zserviss](https://avatars.discourse-cdn.com/v4/letter/z/a9a28c/32.png) [@zserviss](https://pdfjs.community/u/zserviss)\
**Post date:** [January 11, 2023, 9:16pm UTC](https://pdfjs.community/t/free-pdf-js-express-viewer-keys-watermark/2292/3 "2023-01-11T21:16:25Z")

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No it does not leave a watermark, please follow the instructions [here](https://pdfjs.express/documentation/get-started/add-license-key) to add your license key to remove the watermark.

NOTE: localhost will persist watermark, deployed will not.

Best Regards,  
Zach Serviss  
Web Development Support Engineer  
PDFTron Systems, Inc.