Ресурсы по PDF

Справочные руководства о PDF: форматы бумаги A0–A10, PDF/A, PDF/X, разрешение DPI, сжатие и электронные подписи. Понятные и подробные объяснения.

Paper Sizes A0 to A10: Dimensions in mm, cm, inches and pixels

Complete table of A-series paper sizes (ISO 216), from A0 to A10, with dimensions in millimeters, centimeters, inches and pixels at 72 and 300 DPI.

Understand DPI, resolution and pixels: the calculation formula, A4 sizes in pixels, and recommended DPI for screen, printing and OCR.

Understand lossless and lossy PDF compression, the role of DPI, and the best practices to shrink a PDF while keeping it sharp and readable.

Understand PDF/A (ISO 19005): what it is for, how it differs from a normal PDF, its conformance levels, and how to create one.

PDF/X is the ISO standard for reliable prepress exchange: embedded fonts, CMYK colors and a defined output intent for professional printing.

Types of electronic signature, the eIDAS and ESIGN frameworks, legal value and best practices: a clear guide to signing a PDF with confidence.