C3 Envelope Size Guide - Dimensions, Uses & Printing Tips #1398506 (License: Personal Use)

This image displays a standard C3 envelope, measuring 324 mm × 458 mm, designed to hold an A3 sheet folded once (to A4 size). The envelope features a classic V-flap closure and is commonly used for professional correspondence, brochures, and formal invitations requiring larger formats. Its minimalist design emphasizes functionality and postal compliance.

Used on e-commerce product pages, stationery guides, or printing service sites where customers need to verify envelope sizing before purchase; matches user intent for “C3 envelope dimensions” or “what size envelope for A3 paper.”