PaperSizes.io is a free reference site cataloging 250+ international, US and regional paper formats (ISO, ANSI, RA, Imperial) with exact dimensions in mm and inches, comparison tables and a metric/imperial unit switcher.
Completely free, no paywalls or premium tiers.
Print and packaging designers needing to quickly confirm exact dimensions for an unfamiliar paper format or compare sizes across regional standards.
The comparison tool is useful specifically when reconciling US and international paper standards on the same project (e.g. Letter vs. A4), a common point of confusion in cross-border print work.
A quick reference for international paper size standards, metric and imperial.
