Birthday Card Envelopes | Coloured & White Card Envelopes

Because the envelope is the first impression. Birthday card envelopes are available in a wide range of colours to match any card design - from bright and bold to soft pastels and classic white. Available in C6 and other standard card sizes with gummed and peel and seal closures.

Browse related: Greeting Card Envelopes | C6 Envelopes | Colour Envelopes

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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.

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What Our Customers Say

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Aimée Thompson

We ordered some branded envelopes for a client event and they were a perfect addition. Jess and the team were extremely accommodating and attentive throughout the ordering process, pushing our order through to meet the tight deadline. I really recommend this company for branded materials. Thank you team!

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Charlotte Goodman-Brooks

Great Customer Service

Unfortunately my order arrived damaged but after emailing the issue over to the company I received a quick response from Jess who was able to fix the problem in minutes, thanks so much jess, fantastic customer service, will definitely be ordering from this company again.

Man in a suit with a blurred green outdoor background

Great Products, Quick Delivery

DPD were having issues delivering to my address and things were getting frustrating, but the company really stepped up. They sorted the problems with DPD quickly, the replacement arrived super fast, and they refunded my previous order without any hassle. Overall, I’m really impressed – amazing customer service, and I’ll definitely be ordering again!

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Grace

Proactive and Helpful

The courier let us down, but Jess and Kelly were hugely helpful and did everything they could to resolve it. They even arranged to specially stock products I order regularly to make future orders smoother. Great quality, good value and excellent customer service, with the phone answered on the first ring!

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Rebecca R

Really Easy Process

Really easy process to order some custom printed envelopes, James was so helpful and answered all my questions. The envelopes arrived on time and are really great quality, wouldn't hesitate to use this company again!

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Bernie Webber

Great Company To Buy From

Great company to buy from. Very helpful and communicative.

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Paul Craig

Prompt and Efficient Service

Very helpful staff directing me to exactly the right item needed.

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Richard

Fantastic Customer Service

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