# Express functionality questions

**URL:** <https://pdfjs.community/t/express-functionality-questions/1189>\
**Category:** Technical Support\
**Tags:** pdfjs-express\
**Created:** [November 19, 2021, 12:25am UTC](https://pdfjs.community/t/express-functionality-questions/1189 "2021-11-19T00:25:46Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\
**Post date:** [November 19, 2021, 12:25am UTC](https://pdfjs.community/t/express-functionality-questions/1189/3 "2021-11-19T00:25:51Z")

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**Hello, I’m Ron, an automated tech support bot 🤖**

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:
- [Understand coordinates in PDF.js Express - Window coordinates](https://pdfjs.express/documentation/viewer/coordinates.8#window-coordinates)
- [Add watermarks to viewer - Draw custom content as watermark](https://pdfjs.express/documentation/viewer/watermarks.8#draw-custom-content-as-watermark)
- [Add a watermark to a document using the Express REST API - Body params](https://pdfjs.express/documentation/utils/watermark#body-params)

APIs:
- [Core](https://pdfjs.express/api/Core.html#__anchor)
- [ExpressUtils(optionsopt) - # async watermark(options) → {Promise.}](https://pdfjs.express/api/utils/ExpressUtils.html#watermark__anchor)
- [Core.Annotations.TextSquigglyAnnotation - new TextSquigglyAnnotation( [initializer])](https://pdfjs.express/api/Core.Annotations.TextSquigglyAnnotation.html#TextSquigglyAnnotation__anchor)

Forums:
- [Watermark shows for some users](https://pdfjs.community/t/watermark-shows-for-some-users/263/1)
- [Cannot remove watermark, even with license information](https://pdfjs.community/t/cannot-remove-watermark-even-with-license-information/1125/1)
- [Watermark on Dev mode is effecting the search](https://pdfjs.community/t/watermark-on-dev-mode-is-effecting-the-search/717/1)

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