Tips and Advice
Envelope Sizes C5 – DL: For The Perfect Fit Every Time
Picking the right Envelope for your print project can feel like solving a puzzle. You’ve just created something beautiful, but how do you find the perfect Envelope to match? We’ve all been there! That’s why this guide is here, to demystify Envelope sizes so you never have to guess again.
Why does it matter? The right Envelope protects your print, ensures safe delivery and can leave a polished, professional impression. In this post, we’ll cover standard Envelope dimensions, a handy size reference table, paper type options and tips to master Envelope formats. Let’s get started!
Overview of standard Envelope sizes
What is the standard Envelope size?
While there isn’t one single “standard” Envelope size, there are a few widely used dimensions for everyday mail. Below is a quick-reference table to the most popular C-series sizing that is designed to help you find the perfect fit for A-series paper sizes.
| Envelope Size | Standard Dimensions (mm) | Insert Size | Common Use |
| C5 | 229mm x 162mm | A4 folded in half or A5 Prints | Greeting Cards, Invitations |
| C6 | 114mm x 162mm | A4 folded twice or A6 Prints | Postcards, Packaging Inserts, Direct Mail |
| C7 | 84mm x 114mm | A7 Prints or A5 folded twice | Flat Thank You Cards, Appointment Cards, Loyalty Cards |
| DL | 110mm x 220mm | A4 paper folded twice horizontally (in thirds) | Vouchers, Compliment Slips, Letterheads |
| Square | 155mm x 155mm | 148mm x 148mm Square Prints | Unique Greeting Cards, standout Direct Mail |
Printed.com Envelope offering
If your prints need a snug fit, don’t worry, we’ve got you covered.
You might notice that we offer slightly tailored sizes to the ISO 269 standard C-series that offer slightly smaller options to keep materials from rattling inside. Whatever your needs, there’s an Envelope for it and here is our breakdown and what we find works best for our customers:
| Envelope Dimensions | Closest C Series Match | Insert Size | Common Use |
| 151mm x 216mm | C5 | A5 Print | Greeting Cards, Invitations |
| 114mm x 162mm | C6 | A6 Print | Postcards, Packaging Inserts, Direct Mail |
| 82mm x 113mm | C7 | A7 Print | Flat Thank You Cards, Appointment Cards, Loyalty Cards |
| 110mm x 220mm | DL | DL Print | Vouchers, Compliment Slips, Letterheads |
We also offer some extra sizes to make sure we have all your needs covered including Envelopes for traditional 5” x 7” prints a popular option for Wedding Invitations and Greeting Cards and a square alternative perfect for those unique Greeting Cards or standout direct mail.
| Envelope Dimensions | Insert Size | Common Use |
| 133mm x 184mm | 5″ x 7″ Print | Wedding Invitations, Greeting Cards |
| 155mm x 155mm | 148mm x 148mm Print | Greeting Cards, Direct Mail |
Still not sure what Envelope size would work best for your print? Our Customer Service team are always here to help.
Top tips for choosing the right Envelope
- Letterbox Friendly: DL Envelopes slide through almost any letterbox with ease.
- Stand Out: Choose Square Envelopes to make your mail instantly noticeable in a pile of post.
- Brand Consistency: Use materials that align with your brand. Eco-friendly? Go with recycled options. Corporate? Stick to crisp, classic whites.
- Extra Charm: Add a hidden surprise with a printed Envelope Liner for a bigger impact when opened.
Find your perfect Envelope paper type & colour
Envelope material and colour can add a personal touch to your mail. Here are some popular options to consider:
White Envelopes
Most Popular choice, perfect or pairing with any print and is free with most orders.
Kraft Envelopes
Bring a rustic, handmade feel to your Envelopes with the earthy tones of Kraft. One of our most popular and perfect for eco-conscious sends.
Tintoretto Gesso Envelopes
Matched with our most popular luxury paper, Tintoretto Gesso Envelopes add a touchable texture that begs to be opened, perfect for Wedding Stationery or Invitations.
Cotton Envelopes
Perfect for matching Cotton paper, this White Envelope is made from 100% Cotton giving it a soft fabric feel, with the dame great qualities of paper.
Pearl Polar Envelope
Featuring a cool pearlescent sheen, this paper weaves a shimmering tone throughout its surface for a subtle, yet eye-catching finish.
Explore bold colours like Black, Cream, Red, Gold, and Silver to match your project’s aesthetic. For a full list of options, visit our Envelopes page.
Mastering Envelope formatting
Addressing Envelopes properly is just as important as choosing the right size. Follow these tips for a polished finish:
- Center the recipient’s address on the front.
- Add your return address on the back.
- Skip handwriting hundreds of Envelopes, use printed Labels for a clean, professional look.
Pro tip: Use custom Address Labels and Return Address Labels to speed things up and maintain consistency.
Personalise with printed Envelopes
With our custom Printed Envelopes, you can add a personal touch by printing your own addresses, logos or designs directly onto them. This is perfect for making a big impact with large campaigns or giving your Wedding Stationery a professional finish.
Our Personalisation service also lets you add unique names and addresses to each Envelope, saving you from having to write them out by hand.
Wrap up your prints in style
The right Envelope size and material elevate your entire project. Use this guide as your go-to resource for all things Envelopes and don’t forget to refer back to the size table whenever you’re unsure. Ready to take your mail to the next level? Explore our full range of Envelope options to get started.
About the author
When she’s not perusing the factory or planning our next product launch, you’ll find Emma doing some form of exercise. Whether it’s her favourite gym class or a walk around Northumberland with friends, she loves keeping fit!
