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Every e-reader claims PDF support. Almost none of them are usable for it, and the reason is geometry rather than software: a 6-inch screen showing an A4 page renders 10-point type at about 4 points. You end up pinching and panning, which is worse than reading on a phone.
Below 10 inches, do not buy for PDFs. That single rule eliminates most of the market and saves most of the disappointment.
Screen size decides this, not brand
The screen-size maths
- 6–7 inch — reflowed EPUB only. Fine for novels, useless for fixed-layout PDFs.
- 10.2–10.3 inch — an A4 page at roughly 70% scale. Readable for most documents, tight for two-column papers.
- 13.3 inch — A4 at close to actual size. The only category that genuinely solves academic PDFs.
BOOX Tab X C
A4 at near actual size
13.3 inches of colour e-ink with the InkSpire pen. Heavy for handheld reading and not meant for it — this is a desk device that replaces a stack of printouts.
BOOX Note Air 4 C
The flexible one
10.3-inch colour running full Android with Play Store access, so you can use Xodo, Adobe or whatever you already annotate in. That flexibility is the whole argument.
Kindle Scribe: the honest assessment
The Scribe is beautifully built and the writing feel is excellent. Its PDF annotation is the weakest of the three, and it is locked to Amazon. If your documents live in Amazon’s ecosystem it is a fine choice. If they live in Dropbox, Zotero or a university VLE, it will frustrate you.
Colour: useful or not?
For textbooks, charts and colour-coded annotation, genuinely useful. For plain text documents, it costs contrast for nothing. If your PDFs are mostly black text, buy black and white and spend the difference on screen size — which matters far more. More on that in our colour e-reader guide.
Also see our Onyx Boox guide, the best e-readers guide, and the one-minute quiz.