Blog
Guides about paper sizes, dimensions, printing, folding, and standards.
The Ultimate Guide to A4 Paper
Why A4 is the most common paper size in the world, and how its √2 aspect ratio makes it uniquely practical.
US Paper Sizes Explained: Letter, Legal, Tabloid
Why the US uses Letter and Legal instead of A4 — a look at history, dimensions, and the ANSI standard.
Understanding Envelope Sizes: C, DL, B and US
How to choose the right envelope for letters, invitations, and business mail — with dimensions for every standard.
DPI vs PPI: The Complete Guide
What is the difference between DPI and PPI? How many pixels do you need for a 300 DPI A4 print?
How to Fold A4 into A5, A6, and DL
Step-by-step instructions for folding A4 into perfect A5, A6, and DL sizes.
Paper Weight Explained: GSM, lb, and Caliper
What does 80 gsm mean? How does it compare to 100 lb paper? A guide to paper weight units.
Japanese Paper Sizes: JIS A, B, and Traditional Formats
Japan has its own JIS paper standards, including a B series that differs from ISO B.
Traditional British Paper Sizes: Foolscap, Quarto, Imperial
Before ISO, Britain had a rich set of paper sizes named after folding steps.
How to Choose the Right Paper Size for Your Poster
A practical guide to choosing A0, A1, A2, or custom poster sizes based on viewing distance and content.
Business Card Sizes Around the World
From 85 × 55 mm in Europe to 3.5 × 2 inches in the US — a global guide.