A4 vs A3 Paper and When to Use Each

A4 (210 × 297 mm) is the standard for letters, invoices, worksheets and everyday documents. A3 (297 × 420 mm) is twice the area, for posters, plans, large charts and deskpads.

📏 The two sizes

Size	Dimensions	Best for
A4	210 × 297 mm	Letters, invoices, worksheets, everyday documents
A3	297 × 420 mm (twice the area of A4)	Posters, plans, large charts, deskpads

⚠️ Warning: choose the finished size before you design. Most home and small-office printers cannot print A3, so confirm your printer supports both the sheet size and the paper weight.

❓ Frequently asked questions

Can I fold A3 down to A4?

Yes, an A3 sheet folds in half to A4-size panels. Score heavier stock first.

👉 Related guides and next steps

Back to the paper and cardstock complete guide
Best weight for office documents · will it work in my printer?
Browse paper and cardstock
Questions? Email support@valenna.co.za or use the contact form.

A4 vs A3 Paper: When to Use Each | Valenna

A4 vs A3 Paper and When to Use Each

📏 The two sizes

❓ Frequently asked questions

Can I fold A3 down to A4?

👉 Related guides and next steps