If you would like to open image files, PDFTron’s Webviewer supports several image formats. You can render and collaborate on PNG, JPEG, Adobe Photoshop, Illustrator, DICOM, HEIC and hundreds of more image formats.
PDFTron’s WebViewer uses PDFTron’s proprietary rendering engine, without reliance on open-source technologies and allows for more advanced capabilities such as supporting various image file formats.
Please follow the guide to migrate from PDF.js Express to PDFTron’s WebViewer.
Once you have PDFTron’s WebViewer up and running you can reference the guide for the list of image files supported.