Blog
Original articles about paper sizes, dimensions, printing, folding, and industry standards.
Standards
What is A4 Paper? The Complete Guide
Why A4 is the most common paper size in the world and how its √2 aspect ratio makes it uniquely practical.
Standards
US Paper Sizes Explained: Letter, Legal, Tabloid
Why the US uses Letter and Legal instead of A4 — history, dimensions, and the ANSI standard.
Envelopes
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.
Printing
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?
Guides
How to Fold A4 into A5, A6, and DL
Step-by-step instructions for folding A4 into perfect A5, A6, and DL sizes for letters, brochures, and mailings.
Printing
Paper Weight Explained: GSM, lb, and Caliper
What does 80 gsm mean? How does it compare to 100 lb paper? A complete guide to paper weight units.