• There are a couple ways to open PDF files on WhatsApp without having to download them.
• The first option is to open the file with a file viewer tool such as QuickPDF or Adobe Acrobat Reader. These apps allow you to open PDF files without having to download them.
• Another option is to use a web browser such as Google Chrome or Mozilla Firefox. You can open the PDF file in your web browser and zoom in to read it if it is hosted on a website.
• Adobe Acrobat Reader is an application for viewing and printing PDF files. It's available for free on Adobe's website.

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