# 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:** 1

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**Author:** ![zesman](https://avatars.discourse-cdn.com/v4/letter/z/a5b964/32.png) [@zesman](https://pdfjs.community/u/zesman)\
**Post date:** [October 21, 2021, 6:00am UTC](https://pdfjs.community/t/pdfjsexpress-vs-pdftron-highlighting-problem/1083/1 "2021-10-21T06:00:13Z")

</div>

**Which product are you using?**  
PDF.js Express Plus

**PDF.js Express Version**  
|UI version|‘8.1.0’|  
|Core version|‘8.1.0’|  
|Build|‘OS8yMy8yMDIxfGM3YjM4YzBmOQ==’|

**PDFTron Version**  
|UI version|‘8.1.0’|  
|Core version|‘8.1.0’|  
|Build|‘OS85LzIwMjF8NTU4Zjg4N2Fk’|

**Detailed description of issue**  
If i select or highlight a text in a pdf, not all characters are selected or highlighted.  
It also happens if i upload the pdf in your demo application.

Problem picture: https: [//drive.google.com/file/d/1EeyTZ8tmvwJN3AqmQsQNoyaYQ9Lpv2KI/view?usp=sharing](https://drive.google.com/file/d/1EeyTZ8tmvwJN3AqmQsQNoyaYQ9Lpv2KI/view?usp=sharing)

The weird thing is. I tried the same pdf (and different pdfs as well) with PDFJSExpress Plus and PDFTron (both which can be free downloaded, the demo version) and the problem only happens in PDF.js Express Plus. In PDFTron the issue isn’t happening. The Screenshot from the expected behaviour is from PDFTron and the screenshot from the issue is from PDF.js Express Plus

**Expected behaviour**  
I expect that all characters which are selected are highlighted.

Expected picture: https: [//drive.google.com/file/d/1HOPSJIHpWb692KfYtyqH2HYUp9znYuVS/view?usp=sharing](https://drive.google.com/file/d/1HOPSJIHpWb692KfYtyqH2HYUp9znYuVS/view?usp=sharing)

**Does your issue happen with every document, or just one?**  
It happens not on every document, but on some.

**Link to document**

**Code snippet**

- no code implemented for this. I am using tjhe out of the box functionallity

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