Using the Safari web browser in iOS 11, you can save a webpage in PDF format. Here’s how:
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Open Safari on your iPhone or iPad.
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Navigate to a site and then the webpage you want to save as PDF.
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Tap on the Share button.
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In the Activities sheet, tap on Create PDF.
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When the PDF is created tap Done.
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Tap on Save File To …
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Choose the location to which you wish to save the webpage as a PDF.