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:- Add watermarks to viewer - Draw text as watermark
- Rich text - Relevant APIs and events - enableElements
- Localization & language support - Add languages
- Core.Tools.SignatureCreateTool - hidePreview()
- UI.MenuOverlay - add(items [, dataElement])
- Core.Annotations.XFDFUtils - deserializeMeasure(measureDictionary)
Share how you are using PDF.js Express in your organization you could win a $500 Amazon gift card. All participants will receive 6 months of PDF.js Express+ for free. Learn more here