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PDF

Fixed-layout documents: textbooks, papers, comics, and scanned books that do not reflow like EPUB.

Articles, scans, comics, and textbooks that must keep their layout.

A 6-inch reader is the wrong screen for a two-column academic PDF.

FormatsPDF, sometimes with OCR text layers or PDF/UA tags
DRM / licenseSome academic PDFs use Adobe DRM or watermarking. Many PDFs are just files.
How files get inEvery major reader accepts PDF, but e-ink reflow is limited.
StorePublisher sites, academic platforms, and some ebook stores
LibrariesLibraries often lend textbooks as PDF through Adobe or browser lockers, not Libby.
RefundsDepends entirely on the seller.
SyncPDF reading position sync is app-specific (Play Books, Apple Books, Kindle) and often weaker than EPUB.
SharingA personal PDF can be copied. A licensed academic PDF usually cannot.

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PDF

Formats & Files

Which file types actually open, how conversion works, and where DRM changes the rules.

Devices & Apps

Phones, tablets, e-ink readers, and the official apps — plus how to get a file onto them.

Libraries & Lending

Public library apps, loan periods, holds, and what you can legally keep.

Buying & Stores

Where to buy, regional locks, refunds, subscriptions, and family sharing.

Reading Setup

Fonts, spacing, dark mode, highlights, and accessibility controls that make daily reading usable.