Collection: Birthday Card Envelopes

Birthday envelopes are curated in full spectrum — vibrant primaries, pastels and metallics; no single dominant palette. With over 45 products across over 20 sizes, the range provides everything needed to present birthday cards, invitations and correspondence without requiring custom print or bespoke colours.

C6 for standard birthday cards; C5 for larger cards; square formats for contemporary designs. Paper weights run from 100–120gsm. Closure options include gummed and peel & seal.

Benefits of Birthday Envelopes

• Occasion-matched colours — full spectrum — vibrant primaries, pastels and metallics; no single dominant palette.
• over 20 sizes — to match all standard card and invitation formats.
• Paper weights 100–120gsm — for a quality result that complements the card inside.
• Closure choice — gummed and peel & seal to suit personal and volume workflows.
• Royal Mail compatible — standard sizes qualify within Royal Mail weight and size limits.

Frequently Asked Questions

What size envelope fits a birthday card?
Standard birthday cards are typically A5 (148 x 210mm) or A6 (105 x 148mm). An A5 birthday card fits a C5 envelope (162 x 229mm). An A6 card fits a C6 envelope (114 x 162mm). Square birthday cards (typically 145 x 145mm) fit a 155 x 155mm or 160 x 160mm square envelope.

What colours are best for birthday card envelopes?
Birthday envelopes span the full colour spectrum — there is no single dominant palette for birthdays. Bold primaries (red, blue, yellow, green) create energy and celebration. Metallic and pearlescent finishes (gold, silver) suit milestone birthdays. Pastel tones (pink, lilac, pale blue) suit personal and feminine occasions. White and cream remain popular for a clean, quality presentation that lets the card speak for itself.

Are birthday envelopes compatible with Royal Mail?
Yes — standard sizes (C6, DL, C5) qualify as large letter within Royal Mail's weight and thickness limits. Always weigh a complete, sealed envelope before posting at volume — cards with multiple inserts may push the weight above the large letter threshold.