A 4 × 4 envelope is a lovely choice for small square cards, notes and stationery that need a neat, compact finish. Measuring 105 × 105mm, it is designed to hold inserts measuring up to approximately 100 × 100mm.
This size works especially well for:
100 × 100mm inserts
Mini wedding invitations
RSVP cards
Thank you notes
Gift enclosure cards
Small greeting cards
Keepsake messages
Mini photo prints
Handmade stationery
Craft projects
Business thank you cards
Small event inserts
The compact square shape allows your card to slide inside comfortably while keeping everything tidy and well proportioned. It is a versatile envelope size for gifting, celebrations, handmade cards and personal messages, helping each insert remain protected and beautifully presented.