# Manage zoom in mobile using pinch **URL:** \ **Category:** Technical Support\ **Tags:** pdfjs-express\ **Created:** [March 30, 2022, 9:40am UTC](https://pdfjs.community/t/manage-zoom-in-mobile-using-pinch/1523 "2022-03-30T09:40:57Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\ **Post date:** [March 30, 2022, 9:41am UTC](https://pdfjs.community/t/manage-zoom-in-mobile-using-pinch/1523/3 "2022-03-30T09:41:03Z")
**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 - PDF page coordinates](https://pdfjs.express/documentation/viewer/coordinates.8#pdf-page-coordinates) - [Create rectangle annotations in PDF.js Express - Other examples](https://pdfjs.express/documentation/annotation/create-annotation-rectangle#other-examples) - [Page Manipulation](https://pdfjs.express/documentation/advanced/page-manipulation) APIs: - [Core.Annotations.Font - toCSS(zoom)](https://pdfjs.express/api/Core.Annotations.Font.html#toCSS__anchor) - [Core.DocumentViewer - zoomToMouse(zoom, offsetX, offsetY)](https://pdfjs.express/api/Core.DocumentViewer.html#zoomToMouse__anchor) - [Utils - unsetCanvasMultiplier()](https://pdfjs.express/api/7.0/utils.html#unsetCanvasMultiplier__anchor) Forums: - [Express functionality questions](https://pdfjs.community/t/express-functionality-questions/1189/1) - [Zoom by using mouse scroll (Not by using ctrl+scroll)](https://pdfjs.community/t/zoom-by-using-mouse-scroll-not-by-using-ctrl-scroll/111/2) - [Snap viewport to next unsigned signature](https://pdfjs.community/t/snap-viewport-to-next-unsigned-signature/1293/1) --- _[View the full topic](https://pdfjs.community/t/manage-zoom-in-mobile-using-pinch/1523)._