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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More About "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.

Customer Feedback

What Our Customers Say

See why we’re trusted as by thousands of UK businesses for packaging and envelopes through our customer reviews.

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Envelope Printing Customer

Branded envelopes that felt event-ready

We needed branded envelopes for a client event and they looked exactly right. The team were helpful from start to finish and made sure everything moved quickly so we could meet our deadline. A really smooth experience for printed envelopes.

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Envelope Customer

Quick fix after an order issue

My order arrived with a problem, but after I emailed the team I received a quick response and the issue was sorted straight away. It was handled professionally and made me feel confident about ordering again.

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First Time Customer

Fast support when delivery went wrong

There was an issue with the courier delivering to my address, but the team dealt with it quickly and kept things moving. A replacement was arranged and the previous order was refunded without any fuss. It gave me a good first impression and I would order again.

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Wholesale+ Member

Reliable support for regular orders

The courier caused a problem, but Jess and Kelly were quick to help and did everything they could to sort it. They also looked at the products I order regularly and helped make future orders easier. Good value, good quality and service that feels genuinely useful.

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Envelope Printing Customer

Easy custom printed envelope order

Ordering custom printed envelopes was straightforward from the start. James answered my questions clearly, the order arrived when expected and the finished envelopes were great quality. I would be happy to use the service again.

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Wholesale+ Member

Helpful and easy to deal with

A very straightforward company to buy from. The team were helpful, clear with communication and easy to deal with, which makes a big difference when ordering packaging regularly.

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Sample Customer

Helpful advice before ordering

The team helped point me towards the right product before I placed my order. It made the decision much easier and gave me confidence that I was choosing the right packaging for what I needed.

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Packaging Customer

Useful support for flat pack cartons

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