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A5 format
A page size (148 × 210 mm) that is the most common for printed pocket-format books or PDFs meant for on-screen reading.
A5 is a widely adopted compromise for PDF ebooks (unlike EPUB, which has no fixed dimensions): compact enough to be readable on a tablet or e-reader, while staying comfortable for print on demand.
A PDF poorly calibrated for A5, with margins too thin, high-resolution images badly resized or a cover that overflows, looks amateur in print and on screen.
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