Flyer Size and Dimension Guide

Quick answer: In the UK, standard Flyer sizes are based on the A-series and DL formats, as well as square options. A5 flyer size (210mm x 148mm) is the most popular choice for promotional Flyers and flat Leaflets, offering enough space for eye-catching visuals whilst remaining easy to distribute. The right Flyer dimensions depend on your budget, distribution method and the amount of information you need to include.

Choosing the right Flyer or flat Leaflet size can make or break your marketing campaign. Too small, and your message gets lost. Too large, and you’re paying for printing and postage costs you don’t need. Whether you’re promoting a local event, launching a new product or handing out flat Leaflets on the high street, understanding Flyer dimensions is the first step to getting your design right.

Throughout this guide, we’ll refer to these prints as both Flyers and flat Leaflets — two terms for the same thing. We’ll break down every standard Flyer size available in the UK, from the pocket-sized A7 to the Poster-like A3, covering exact measurements in millimetres, centimetres and inches, so you can choose the right paper size for your print run with confidence.

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What is the standard Flyer size?

There isn’t just one standard Flyer size in the UK. Instead, printers and designers work from the international “A” paper size series, alongside a few other popular formats like DL and square Flyers. Each size suits a different purpose, from small handouts to large-format promotional Posters.

Below, we’ve listed every common Flyer size and its dimensions in millimetres, centimetres and inches.

A7 Flyers

A7 Flyer Size

• 105mm x 74mm
• 10.5cm x 7.4cm
• 4.13 inch x 2.9 inch

A7 is the smallest Flyer or flat Leaflet size on this list. Roughly the size of a large business card, A7 Flyers work well for quick promotional handouts, event tickets or Gift Vouchers where space is limited and cost-efficiency matters most.

A6 Flyers

A6 Flyer Size

• 148mm x 105mm
• 14.8cm x 10.5cm
• 5.83 inch x 4.13 inch

A6 is roughly the size of a Postcard, making it a popular choice for direct mail campaigns and in-store flat Leaflets. It gives you a little more room than A7 for text and imagery, without the printing and postage costs of a larger Flyer.

A5 Flyers

A5 Flyer Size

• 210mm x 148mm
• 21cm x 14.8cm
• 8.27 inch x 5.83 inch

A5 is the most widely used size for promotional Flyers and flat leaflets in the UK. It’s large enough to include a headline, key details and eye-catching imagery, yet small enough to hand out on the street or slot through a letterbox. If you’re unsure which size to choose, A5 is usually a safe bet.

A4 Flyers

A4 Flyer Size

• 210mm x 297mm
• 21cm x 29.7cm
• 8.27 inch x 11.69 inch

A4 Flyers are the same size as a standard sheet of printer paper, giving you plenty of room for detailed information, imagery and branding. They’re a strong choice for Menus, price lists or Flyers and flat Leaflets designed to be pinned up on noticeboards.

A3 Flyers

A3 Flyer Size

• 297mm x 420mm
• 29.7cm x 42cm
• 11.69 inch x 16.54 inch

A3 is double the size of A4 and works more like a mini Poster than a traditional Flyer or flat Leaflet. It’s ideal for window displays, event Posters or anywhere you need your message to be seen from a distance.

DL Flyers

DL Flyer Size

• 210mm x 99mm
• 21cm x 9.9cm
• 8.27 inch x 3.9 inch

DL is a long, slim format, originally designed to fit a standard envelope without folding. This makes DL Flyers a popular choice for direct mail, Menus and price lists that need to slot neatly through a letterbox or into a display rack. DL flat Leaflets are especially useful for campaigns where portability and sleek design are key.

Square Flyers

Square Flyers stand out simply because they break away from the traditional rectangular format. They’re a popular choice for social media promotions, invitations and modern branding.

Small Square Flyer Size

• 105mm x 105mm
• 10.5cm x 10.5cm
• 4.13 inch x 4.13 inch

Medium Square Flyer Size

• 148mm x 148mm
• 14.8cm x 14.8cm
• 5.83 inch x 5.83 inch

Large Square Flyer Size

• 210mm x 210mm
• 21cm x 21cm
• 8.27 inch x 8.27 inch

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What’s the best size for promotional Flyers?

For most promotional Flyers, A5 Flyer size strikes the best balance between visibility and cost. It’s large enough to grab attention and include key details, without the higher printing and postage costs associated with A4 or A3.

Choose A6 or DL if you’re working with a tighter budget or distributing Flyers by post, as their smaller Flyer dimensions reduce printing costs. Choose A4 or A3 if your Flyer needs to double up as a Poster or display piece, where visibility from a distance matters more than portability.

What’s the best size for Product Care Cards?

For Product Care Cards, A7 is the ideal size. Compact yet functional, it’s small enough to be easily stored alongside the product while still offering enough space for all the essential care details. Printing on both sides of 350gsm uncoated paper ensures durability and a premium feel, giving your customers a practical guide they can keep handy to maintain their products in top condition over time.

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What is the difference between an A5 and a DL Flyer?

The main difference between A5 and DL Flyers comes down to shape and use case. A5 Flyers measure 210mm x 148mm, giving a more traditional rectangular shape that suits most promotional needs. DL Flyers measure 210mm x 99mm, a slimmer format originally designed to fit through a standard letterbox or envelope without folding.

If you’re planning a direct mail campaign, DL is often the better choice, since it fits neatly into envelopes and post slots. If you want a Flyer that’s easier to read at a glance, with more room for images and text, A5 is usually the stronger option.

How to change Flyer size on Canva

Changing your Flyer dimensions on Canva is straightforward:

1. Open your Canva design, then click “File” in the top menu.
2. Select “Resize” from the dropdown.
3. Choose a preset Flyer size (such as A5 or A4), or enter your own custom Flyer dimensions in millimetres or inches as shown in the below image.
4. Click “Resize” to confirm, then adjust your design elements to fit the new layout.

Keep in mind that resizing your Flyer can shift text and images out of place, so it’s worth reviewing your entire design after making any changes. For more tips on resizing in Canva, check out our full Canva Resize Guide.

Choosing the right Flyer size for your campaign

Getting your Flyer or flat Leaflet dimensions right is one of the simplest ways to make sure your marketing budget works as hard as possible. A5 remains the go-to choice for most promotional Flyers, but don’t be afraid to size up to A4 or A3 for greater visual impact or down to A6 and DL for cost-effective direct mail.

Once you’ve settled on the right Flyer or flat Leaflet size, the next step is making sure your design fits the format perfectly, so your message lands exactly the way you intended.

Other frequently asked questions

What paper weight should I use for Flyers?
Most Flyers are printed on paper weighing between 130gsm and 170gsm. This gives a sturdy feel without the extra cost of heavier card stock, which is better suited to items like business cards or invitations.

Can I print Flyers in a custom size?
Yes, most print shops and online design tools like Canva allow you to create Flyers in custom dimensions. Just bear in mind that non-standard sizes may cost more to print, as they don’t always align with standard paper stock.

Should Flyers be printed single-sided or double-sided?
This depends on how much information you need to share. Single-sided Flyers work well for simple, punchy messages, while double-sided Flyers give you extra space for details like pricing, maps or terms and conditions.

Do Flyer sizes affect postage costs?
Yes. In the UK, Royal Mail pricing is based on the size and weight of your mail item, so smaller Flyers like A6 or DL are often cheaper to post than larger A4 or A3 formats.