# PDFJSExpress vs PDFTron highlighting problem

**URL:** <https://pdfjs.community/t/pdfjsexpress-vs-pdftron-highlighting-problem/1083>\
**Category:** Technical Support\
**Created:** [October 21, 2021, 6:00am UTC](https://pdfjs.community/t/pdfjsexpress-vs-pdftron-highlighting-problem/1083 "2021-10-21T06:00:13Z")\
**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:** [October 21, 2021, 6:00am UTC](https://pdfjs.community/t/pdfjsexpress-vs-pdftron-highlighting-problem/1083/3 "2021-10-21T06:00:17Z")

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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:
- [Migrating from PDF.js Express to PDFTron - 4. Updating merge and extraction code](https://pdfjs.express/documentation/learn-more/pdfjs-express-to-pdftron.8#4.-updating-merge-and-extraction-code)
- [Integrating PDF.js Express Viewer with NPM - 3. Usage](https://pdfjs.express/documentation/get-started-viewer/npm#3.-usage)
- [Core engine for WebViewer - Creating your own UI using WebViewer Core](https://pdfjs.express/documentation/ui-customization/core.8#creating-your-own-ui-using-webviewer-core)

APIs:
- [PDF.js Express Utilities](https://pdfjs.express/api/utils/index.html#__anchor)
- [Core.DocumentViewer - setPagesUpdatedInternalAnnotationsTransform(handler)](https://pdfjs.express/api/Core.DocumentViewer.html#setPagesUpdatedInternalAnnotationsTransform__anchor)
- [Core.DisplayModeManager - setDisplayMode(displayMode)](https://pdfjs.express/api/Core.DisplayModeManager.html#setDisplayMode__anchor)

Forums:
- [Pdf js viewer throwing error on Firefox](https://pdfjs.community/t/pdf-js-viewer-throwing-error-on-firefox/429/1)
- [Is there any way to remove watermarks in development mode?](https://pdfjs.community/t/is-there-any-way-to-remove-watermarks-in-development-mode/443/1)
- [Annotation goes non responsive(View only) if left still for a week](https://pdfjs.community/t/annotation-goes-non-responsive-view-only-if-left-still-for-a-week/573/1)

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