A quick guide to postcard size in the UK.

What size is a postcard in the UK?

The standard UK postcard size is usually A6, measuring 105 × 148 mm (4.1 × 5.8 in). This is a similar size to your standard greeting card – but without the extra fold and envelope required.

But A6 is not the only option available. Other common postcard sizes and formats include:

• Square (120 × 120 mm, 4.72 × 4.72 in)
• DL (99 × 210 mm, 3.89 × 8.26 in)
• Medium (127 × 177.8 mm, 5 × 7 in)
• A5 (148 × 210 mm, 5.82 × 8.26 in)

4 postcard format and size options.

Size matters for postcards. A6 is a popular choice, but thinking outside the box and stepping out of the norm by having unusual shapes and sizes can help you grab people’s attention.

Here are the four main postcard styles you can use for personal or professional messaging.

Standard postcard sizes.

The standard UK postcard size is A6, measuring 105 × 148 mm (4.13 × 5.82 in). Though it’s worth noting that in the US, standard postcards are slightly larger at 4 × 6 in (101.6 × 152.4 mm).

Standard postcards are compact, yet versatile. Think short, snappy messages for events and promotional handouts – or a more traditional postcard you’d send on holiday. Small space equals smart, succinct messaging. Striking visuals on the front are the cherry on top.

Larger postcard sizes.

Larger postcard sizes range from 127 × 177.8 mm (5 × 7 in) to A5 formats at 148 × 210 mm (5.82 × 8.26 in). In a nutshell, there’s more room. Meaning bolder visuals and more text.

Marketing for a local estate agent? They’re great for posting new home listings in local areas or advertising your services to nearby homes. Launching a hot new product? They’re good for that too, as there’s more room to show off any unique features.

Square postcard sizes.

Square postcard sizes are usually 120 × 120 mm (4.72 × 4.72 in). It’s a balanced shape that’s eye-catching, with a unique feel to it. If you’re a minimalist, it’s great for a ‘less is more’ design approach. Think thank you notes or special offers for loyal customers.

DL card and postcard sizes.

DL postcards measure 99 × 210 mm (3.9 × 8.26 in). This makes for a sleek, long look. DL cards and postcards are often used in direct marketing campaigns, as their linear layout allows for step-by-step messaging and clean visuals. You could try using this format for loyalty vouchers, menus, or event invites, for example.

Tips for creating the perfect sized postcard with Adobe Express.

Designing a postcard that stands out – for business or pleasure – is more than just looking good. With Adobe Express, you’ve got access to intuitive tools and editable templates to help you align your design to the perfect postcard size.

Here are some other tips to consider when designing a postcard:

1. Think about the orientation of your postcard.

Decide whether your postcard is going to be landscape or portrait, and whether you’ll need a horizontal or vertical design. Landscape is great for scenic imagery or a photo collage, while portrait is better for more formal content.

2. Make sure to add a bleed area if you’re planning to print.

Planning to print and send your postcard? Don’t forget to extend the size of your design slightly to allow for a bleed around the design. You should typically add a bleed of around 3mm on each edge, so you don’t have to worry about unsightly white borders when it comes to printing and cutting. This is especially important if you’re doing full image backgrounds or colour-rich designs.

3. Use editable templates for a head-start.

Looking to save some time? Make the most of ready-made postcard templates to ensure you create the right size postcard. Simply select your ideal size and format, then customise the design to your liking. You can also add your own branding in a single click with Adobe Express for Business.

4. Choose the right size for your purpose.

Match your postcard size to its purpose. Small A6 ones are good for simple greetings, while larger A5 postcards work well for promotional messaging. Using a bigger card can also improve readability for your target audience.

5. Optimise your visuals and fonts for clarity.

Use high-resolution images and ensure the font is readable from a distance. Don’t overdo it with the fonts. Less is more – so stick to just two or three. Remember, less clutter means clearer messaging. You should also make sure there’s a clear contrast between the text and background for easy communication.