# Technical Support **URL:** https://pdfjs.community/c/technical-support/7.md [Latest](https://pdfjs.community/latest.md) · [Categories](https://pdfjs.community/categories.md) · [Tags](https://pdfjs.community/tags.md) --- ## [About the Technical Support category](https://pdfjs.community/t/about-the-technical-support-category/15)
**Author:** [@dev](https://pdfjs.community/u/dev)\ **Replies:** 0\ **Last updated:** [May 22, 2020, 5:32am UTC](https://pdfjs.community/t/about-the-technical-support-category/15 "2020-05-22T05:32:44Z")
This category is used for asking and answering technical questions related to PDF.js and PDF.js Express. --- ## [Can you please update my email to mohamed.ahmed@ethifinance.com](https://pdfjs.community/t/can-you-please-update-my-email-to-mohamed-ahmed-ethifinance-com/3823)
**Author:** [@mohamed.ahmed](https://pdfjs.community/u/mohamed.ahmed)\ **Replies:** 6\ **Last updated:** [October 23, 2026, 8:15pm UTC](https://pdfjs.community/t/can-you-please-update-my-email-to-mohamed-ahmed-ethifinance-com/3823 "2026-10-23T20:15:41Z")
Can you please update my email to mohamed.ahmed@ethifinance.com --- ## [Watermark showing with valid license key](https://pdfjs.community/t/watermark-showing-with-valid-license-key/3818)
**Author:** [@yavula1](https://pdfjs.community/u/yavula1)\ **Replies:** 2\ **Last updated:** [June 16, 2026, 2:44pm UTC](https://pdfjs.community/t/watermark-showing-with-valid-license-key/3818 "2026-06-16T14:44:52Z")
PDFJS Express Which product are you using? 8.7.0 PDF.js Express Version We have valid key and it was working before, recently we noticed PDF JS express watermark is showing on document. Detailed description of issue … --- ## [Water mark issue](https://pdfjs.community/t/water-mark-issue/3817)
**Author:** [@pardeep.singh](https://pdfjs.community/u/pardeep.singh)\ **Replies:** 4\ **Last updated:** [May 13, 2026, 4:27am UTC](https://pdfjs.community/t/water-mark-issue/3817 "2026-05-13T04:27:56Z")
Which product are you using? PDF.js Express Plus PDF.js Express Version 8.7.2 Detailed description of issue Hi Team, I am currently using both Apryse and PDF.js Express products on my website with valid licensed ke… --- ## [Tried to go to invalid bookmark destination](https://pdfjs.community/t/tried-to-go-to-invalid-bookmark-destination/3816)
**Author:** [@devaraju.kaliappan](https://pdfjs.community/u/devaraju.kaliappan)\ **Replies:** 1\ **Last updated:** [March 3, 2026, 4:57pm UTC](https://pdfjs.community/t/tried-to-go-to-invalid-bookmark-destination/3816 "2026-03-03T16:57:14Z")
Dear Team, I am experiencing an issue with hyperlink navigation in the viewer outline section. When I click on a hyperlink that is supposed to take me to another page or a specific position within the same document, it … --- ## [Issue while loading the PDF with WebViewer instance](https://pdfjs.community/t/issue-while-loading-the-pdf-with-webviewer-instance/3812)
**Author:** [@Steven](https://pdfjs.community/u/Steven)\ **Replies:** 1\ **Last updated:** [December 17, 2025, 5:43pm UTC](https://pdfjs.community/t/issue-while-loading-the-pdf-with-webviewer-instance/3812 "2025-12-17T17:43:07Z")
Which product are you using? PDF.js Express Version Detailed description of issue Hi We are attempting to render a attached PDF using the WebViewer instance; however, the document is not being displayed accurately … --- ## [PDF markup adding measurements not working](https://pdfjs.community/t/pdf-markup-adding-measurements-not-working/3811)
**Author:** [@Steven](https://pdfjs.community/u/Steven)\ **Replies:** 11\ **Last updated:** [December 10, 2025, 9:40pm UTC](https://pdfjs.community/t/pdf-markup-adding-measurements-not-working/3811 "2025-12-10T21:40:54Z")
Which product are you using? PDF.js Express Version Detailed description of issue Hi, We are using 8.7.4 version of PDF Express in our react code. We are facing an issue of the adding markup, mentioned below. Gene… --- ## [Issue with License Key Transmission](https://pdfjs.community/t/issue-with-license-key-transmission/3810)
**Author:** [@luckyguy0827](https://pdfjs.community/u/luckyguy0827)\ **Replies:** 1\ **Last updated:** [November 26, 2025, 3:18pm UTC](https://pdfjs.community/t/issue-with-license-key-transmission/3810 "2025-11-26T15:18:45Z")
PDF.js Express Viewer PDF.js Express Version 8.7.5 Detailed description of issue {I am experiencing an issue where the license key is being transmitted as a null value after obtaining and executing the license key. C… --- ## [Uncaught (in promise) TypeError: Cannot set properties of undefined (setting 'i18n') at setLanguage.js:44:12](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271)
**Author:** [@alexb](https://pdfjs.community/u/alexb)\ **Replies:** 26\ **Last updated:** [November 19, 2025, 6:15pm UTC](https://pdfjs.community/t/uncaught-in-promise-typeerror-cannot-set-properties-of-undefined-setting-i18n-at-setlanguage-js12/2271 "2025-11-19T18:15:07Z")
Which product are you using? PDF.js Express Viewer PDF.js Express Version UI version ‘8.7.0’ Core version ‘8.7.0’ webviewer.min.js ‘8.7.0’ Build ‘Ny8yMC8yMDIyfDJhMWM5ZWYwOA==’ Detailed description of is… --- ## [Outdated JavaScript Library: Moment.js 2.29.3](https://pdfjs.community/t/outdated-javascript-library-moment-js-2-29-3/3574)
**Author:** [@jonathan.rhodes](https://pdfjs.community/u/jonathan.rhodes)\ **Replies:** 3\ **Last updated:** [November 7, 2025, 3:48am UTC](https://pdfjs.community/t/outdated-javascript-library-moment-js-2-29-3/3574 "2025-11-07T03:48:58Z")
Which product are you using? PDF.js Express Plus PDF.js Express Version Build: “MS8yMC8yMDIzfGIzYTExOTI2Yw==” Core version: “8.7.1” Full API: false UI version: “8.7.0” WebViewer Server: false webviewer.min.js: “8.7.1… --- ## [Colours on Drawn Signatures not saving](https://pdfjs.community/t/colours-on-drawn-signatures-not-saving/3804)
**Author:** [@tomc](https://pdfjs.community/u/tomc)\ **Replies:** 3\ **Last updated:** [October 28, 2025, 6:22pm UTC](https://pdfjs.community/t/colours-on-drawn-signatures-not-saving/3804 "2025-10-28T18:22:08Z")
Which product are you using? PDF.js Express Plus PDF.js Express Version UI version ‘8.7.0’ Core version ‘8.7.5’ Detailed description of issue I’m saving signatures that the user draws. If the user creates a signatu… --- ## [Full version of PDFNetJS has not been loaded](https://pdfjs.community/t/full-version-of-pdfnetjs-has-not-been-loaded/2163)
**Author:** [@alex](https://pdfjs.community/u/alex)\ **Replies:** 8\ **Last updated:** [October 17, 2025, 1:28pm UTC](https://pdfjs.community/t/full-version-of-pdfnetjs-has-not-been-loaded/2163 "2025-10-17T13:28:12Z")
Which product are you using? PDF.js Express Plus PDF.js Express Version 8.7.0 Detailed description of issue We are seeing the following error without any code changes on our side: Uncaught (in promise) Error: Full … --- ## [Watermarks still appearing despite license key configuration](https://pdfjs.community/t/watermarks-still-appearing-despite-license-key-configuration/3803)
**Author:** [@aryeborgen](https://pdfjs.community/u/aryeborgen)\ **Replies:** 1\ **Last updated:** [September 29, 2025, 3:28pm UTC](https://pdfjs.community/t/watermarks-still-appearing-despite-license-key-configuration/3803 "2025-09-29T15:28:21Z")
Which product are you using? PDF.js Express Viewer PDF.js Express Version 8.7.5 Detailed description of issue Watermarks are still appearing on all PDF documents despite configuring a license key. The viewer loads a… --- ## [Printing stuck on 'Processing'](https://pdfjs.community/t/printing-stuck-on-processing/3801)
**Author:** [@rob](https://pdfjs.community/u/rob)\ **Replies:** 3\ **Last updated:** [September 17, 2025, 7:17pm UTC](https://pdfjs.community/t/printing-stuck-on-processing/3801 "2025-09-17T19:17:40Z")
Which product are you using? PDF.js Express Viewer PDF.js Express Version This does not get printed to the developer console when you load express Detailed description of issue Recently we found when printing the PD… --- ## [How to disable font face via API?](https://pdfjs.community/t/how-to-disable-font-face-via-api/3797)
**Author:** [@dale](https://pdfjs.community/u/dale)\ **Replies:** 3\ **Last updated:** [September 15, 2025, 3:57pm UTC](https://pdfjs.community/t/how-to-disable-font-face-via-api/3797 "2025-09-15T15:57:59Z")
Continuing on from this problem here, we found that disabling the font face in the compiled code actually let us use fallback fonts instead of having an error. Is there a way to set the disableFontFace boolean program… --- ## [Best Practices for managing memory in react](https://pdfjs.community/t/best-practices-for-managing-memory-in-react/3795)
**Author:** [@dale](https://pdfjs.community/u/dale)\ **Replies:** 3\ **Last updated:** [September 11, 2025, 1:57pm UTC](https://pdfjs.community/t/best-practices-for-managing-memory-in-react/3795 "2025-09-11T13:57:27Z")
Using PDFJS Webviewer in React, what are some tips/best practices for managing memory when dealing with a single webviewer and multiple pdf documents. Currently our memory usage grows with each document switch, even … --- ## [Failed to load font 'g\_d1\_f9': 'SyntaxError: Invalid font data in ArrayBuffer.'](https://pdfjs.community/t/failed-to-load-font-g-d1-f9-syntaxerror-invalid-font-data-in-arraybuffer/3758)
**Author:** [@dale](https://pdfjs.community/u/dale)\ **Replies:** 9\ **Last updated:** [September 11, 2025, 7:15am UTC](https://pdfjs.community/t/failed-to-load-font-g-d1-f9-syntaxerror-invalid-font-data-in-arraybuffer/3758 "2025-09-11T07:15:28Z")
Which product are you using? PDF.js Express Viewer PDF.js Express Version 8.7,4 Detailed description of issue Fonts not displaying on PDF. They work everywhere else, just not in PDFJs or the demo webviewer. Failed… --- ## [PDF.js Express Viewer shows 'pdfjs.express' watermarks always?](https://pdfjs.community/t/pdf-js-express-viewer-shows-pdfjs-express-watermarks-always/3786)
**Author:** [@y-masuda](https://pdfjs.community/u/y-masuda)\ **Replies:** 1\ **Last updated:** [August 26, 2025, 5:30pm UTC](https://pdfjs.community/t/pdf-js-express-viewer-shows-pdfjs-express-watermarks-always/3786 "2025-08-26T17:30:11Z")
Which product are you using? PDF.js Express Viewer PDF.js Express Version v8.7.5 Detailed description of issue I obtained a free license using my company email address, but during development on localhost, a waterma… --- ## [High Quality Option in Print PDF Not Providing 100% Quality](https://pdfjs.community/t/high-quality-option-in-print-pdf-not-providing-100-quality/3785)
**Author:** [@Steven](https://pdfjs.community/u/Steven)\ **Replies:** 1\ **Last updated:** [August 22, 2025, 1:55pm UTC](https://pdfjs.community/t/high-quality-option-in-print-pdf-not-providing-100-quality/3785 "2025-08-22T13:55:22Z")
When we click on the Print button, it opens a pop-up allowing us to save the PDF. In this pop-up, we have two quality options: Normal and High. The issue is that the High option does not provide 100% high quality output… --- ## [Request for Wildcard FQDN to Whitelist for Merge API](https://pdfjs.community/t/request-for-wildcard-fqdn-to-whitelist-for-merge-api/3784)
**Author:** [@sanoop](https://pdfjs.community/u/sanoop)\ **Replies:** 1\ **Last updated:** [August 21, 2025, 9:15pm UTC](https://pdfjs.community/t/request-for-wildcard-fqdn-to-whitelist-for-merge-api/3784 "2025-08-21T21:15:47Z")
Which product are you using? PDF.js Express Plus PDF.js Express Version UI version 6.3.3 Core version 6.3.4 Detailed description of issue We are using the PDF.js Express Merge API in our application to process file… --- ## [Merge API returning 500 error response](https://pdfjs.community/t/merge-api-returning-500-error-response/3780)
**Author:** [@jon.anders](https://pdfjs.community/u/jon.anders)\ **Replies:** 3\ **Last updated:** [August 20, 2025, 3:06pm UTC](https://pdfjs.community/t/merge-api-returning-500-error-response/3780 "2025-08-20T15:06:50Z")
Which product are you using? PDF.js Express Plus PDF.js Express Version 8.7.5 Detailed description of issue For some of our users, when attempting to use the merge API endpoint in Chrome / Edge, they are receiving a… --- ## [Invoice/watermark](https://pdfjs.community/t/invoice-watermark/3775)
**Author:** [@david.l1](https://pdfjs.community/u/david.l1)\ **Replies:** 1\ **Last updated:** [August 8, 2025, 5:28pm UTC](https://pdfjs.community/t/invoice-watermark/3775 "2025-08-08T17:28:52Z")
\ **Author:** [@t.wilsmann](https://pdfjs.community/u/t.wilsmann)\ **Replies:** 1\ **Last updated:** [August 8, 2025, 4:23pm UTC](https://pdfjs.community/t/watermark-license-not-valid-although-renewed-paid/3777 "2025-08-08T16:23:55Z") Which product are you using? PDF.js Express Plus PDF.js Express Version 8.7.0 Detailed description of issue I received the invoce, ##7D944E93-0026, and paid by Visa credit card automatically. However the watermark i… --- ## [Showing Waterark on viewer](https://pdfjs.community/t/showing-waterark-on-viewer/3773)
**Author:** [@crossbim001](https://pdfjs.community/u/crossbim001)\ **Replies:** 4\ **Last updated:** [August 6, 2025, 9:41pm UTC](https://pdfjs.community/t/showing-waterark-on-viewer/3773 "2025-08-06T21:41:30Z")
I received the invoce, #AC28938D-0021, and paid by Visa credit card automatically. However the watermark is show on the viewer. Would you check the payment status? FYI, receipt number is 2765-6779. Which product are yo… --- ## [Is there any alternate way to mention origins instead of mentioning them in configorigin.txt to access config files](https://pdfjs.community/t/is-there-any-alternate-way-to-mention-origins-instead-of-mentioning-them-in-configorigin-txt-to-access-config-files/3770)
**Author:** [@kishan.senjaliya](https://pdfjs.community/u/kishan.senjaliya)\ **Replies:** 5\ **Last updated:** [August 5, 2025, 7:01pm UTC](https://pdfjs.community/t/is-there-any-alternate-way-to-mention-origins-instead-of-mentioning-them-in-configorigin-txt-to-access-config-files/3770 "2025-08-05T19:01:54Z")
We are using pdf js express viewer version. We did host the component files from node modules and the config files to one of our CDN servers and to access those files from different origin we need to keep on adding new o… --- ## [Watermark visible with valid license](https://pdfjs.community/t/watermark-visible-with-valid-license/3763)
**Author:** [@nick1](https://pdfjs.community/u/nick1)\ **Replies:** 8\ **Last updated:** [August 4, 2025, 12:01pm UTC](https://pdfjs.community/t/watermark-visible-with-valid-license/3763 "2025-08-04T12:01:48Z")
Which product are you using? PDF.js Express Viewer PDF.js Express Version |UI version|‘8.7.0’| |Core version|‘8.7.5’| |webviewer.min.js|‘8.7.5’| Detailed description of issue I tried to add express viewer to magen… --- ## [When extract annotation, in the returned XFDF annotation text, the highlight colour is different](https://pdfjs.community/t/when-extract-annotation-in-the-returned-xfdf-annotation-text-the-highlight-colour-is-different/3759)
**Author:** [@jrobertshawe](https://pdfjs.community/u/jrobertshawe)\ **Replies:** 4\ **Last updated:** [July 14, 2025, 7:05pm UTC](https://pdfjs.community/t/when-extract-annotation-in-the-returned-xfdf-annotation-text-the-highlight-colour-is-different/3759 "2025-07-14T19:05:51Z")
Which product are you using? PDF.js Express Plus PDF.js Express Version 8.7.5 Detailed description of issue I am extracting the annotation from the PDF and the colour comes back as a random value Expected behavio… --- ## [XFDF Merge API giving a 500 internal server error - Server-side request must use server-side key](https://pdfjs.community/t/xfdf-merge-api-giving-a-500-internal-server-error-server-side-request-must-use-server-side-key/3760)
**Author:** [@Bitbean](https://pdfjs.community/u/Bitbean)\ **Replies:** 1\ **Last updated:** [July 10, 2025, 8:40pm UTC](https://pdfjs.community/t/xfdf-merge-api-giving-a-500-internal-server-error-server-side-request-must-use-server-side-key/3760 "2025-07-10T20:40:03Z")
Which product are you using? PDF.js Express Plus PDF.js Express Version 8.7.3 (with pdfjs-express-utils v1.3.1) Detailed description of issue Many of our users are receiving a 500 internal server error with an error… --- ## [Sticky Note auto reply](https://pdfjs.community/t/sticky-note-auto-reply/3747)
**Author:** [@dopefakedusername](https://pdfjs.community/u/dopefakedusername)\ **Replies:** 9\ **Last updated:** [July 9, 2025, 6:17pm UTC](https://pdfjs.community/t/sticky-note-auto-reply/3747 "2025-07-09T18:17:19Z")
Which product are you using? PDF.js Express Viewer PDF.js Express Version 8.7.4 Detailed description of issue Is it possible to disable the auto reply created by updating annotation state? Is it also possible to dec… --- ## [URGENT - XFDF Merge API giving \[500\] internal server error](https://pdfjs.community/t/urgent-xfdf-merge-api-giving-500-internal-server-error/2331)
**Author:** [@devops1](https://pdfjs.community/u/devops1)\ **Replies:** 3\ **Last updated:** [July 7, 2025, 3:49pm UTC](https://pdfjs.community/t/urgent-xfdf-merge-api-giving-500-internal-server-error/2331 "2025-07-07T15:49:54Z")
Which product are you using? PDF.js Express Plus PDF.js Express Version v8.7.0 Detailed description of issue There is an issue with the merge function provided by @pdftron/pdfjs-express-utils. Some users, using c… [Next page](https://pdfjs.community/c/technical-support/7.md?page=1)