Brand advertising posters: the brief, the layout rules and the print specification
A poster has about three seconds to be read, so the layout is built around one image, one line and one action.
Published by AI Knows Us · Updated 12 October 2026
A brand advertising poster works when a passer-by can take in the brand, the idea and the next step in about three seconds. Build it from one dominant image, one headline of a few words, the brand mark and a single call to action, then set it up for print with the right size, bleed and resolution. Everything else on the layout is competing with those four elements.
This guide gives you the brief to write before design starts, the layout rules that make a poster readable at distance, and the print specification to hand to the printer.
Write the brief first
A poster brief fits on half a page. Answer these questions in writing before anyone opens a design tool.
- Who is it for? A specific person, and where they will see it: a bus stop, a shop window, a corridor, a trade stand.
- What is the one idea? A sentence the viewer can repeat.
- What should they do? Visit, scan, call, come in, remember the name.
- How long will they look? A driver gives it a glance, a commuter on a platform gives it more.
- What must appear? Logo, web address, legal lines, partner marks.
The viewing situation decides the design. A poster read from a moving car needs fewer words and bigger type than one read by someone waiting for a train.
Layout rules that work
One focal point
The eye needs to know where to land. Use one dominant image or one dominant block of type, and let everything else be clearly smaller. Two equal-weight elements fight and the viewer reads neither.
A headline that does the job alone
If a viewer reads only the headline and the logo, the poster should still work. Aim for a handful of words. Put the longer explanation in smaller type for the viewer who steps closer.
Contrast and legibility
Dark text on a light ground, or the reverse, with strong contrast between them. Avoid text over a busy photograph unless you place it on a calm area or add a plain panel behind it. Test legibility by pinning a printout on a wall and stepping back.
Hierarchy in three levels
Level one is the headline. Level two is the supporting line or the offer. Level three is the details: address, dates, web address. Three levels are enough for most posters.
White space
Empty space is part of the design. It gives the focal point room and makes the poster feel confident. Crowded posters look like notices.
A call to action that can be used
Put a short web address, a QR code or a phone number at the bottom, large enough to read or scan from the intended distance. If you use a QR code, point it at a page built for a phone, and test the printed code with two or three different phones before you order.
Brand consistency
A poster is a brand asset, so use the logo, colors and fonts from your brand guidelines. The mark should appear in the same place across a campaign so repeat viewers recognise the series. Keep the tone of the words in line with your other materials. A poster that feels like a different company wastes the recognition you have built.
Sizes, resolution and print setup
| Item | What to specify |
|---|---|
| Size | A-series paper sizes are common outside North America: A3 is 297 by 420 mm, A2 is 420 by 594 mm, A1 is 594 by 841 mm. US printers use inch sizes such as 18 by 24 and 24 by 36 |
| Bleed | Extend the background beyond the trim edge, commonly 3 mm in A-series printing. Confirm your printer's figure |
| Safe area | Keep text and logos inside the trim by a clear margin, so a small cutting shift does not clip them |
| Resolution | Images at the printer's recommended resolution for the final size. 300 pixels per inch is a common figure for close viewing, and large posters viewed from a distance can use less |
| Color mode | Build in the color mode the printer requests, usually CMYK for ink printing. Screen colors can shift in print |
| File | A print ready PDF with fonts embedded or converted to outlines |
| Proof | Ask for a printed proof of a large order before the full run |
The printer's own specification sheet overrides any general figure here. Send them the file for a pre-flight check before the run.
Where the poster goes
Placement decides the size, the stock and the finish. Indoor posters can use lighter paper. Outdoor posters need weather resistant material and stronger fixings, a topic covered in our guide to outdoor banners and their legibility arithmetic. For print that the viewer takes away, see brochure design, and for items that go with a poster at an event, promotional merchandise and printed materials.
Test before you print
- Show the design to three people for three seconds and ask what they saw. If they cannot name the brand and the idea, simplify.
- View a full size printout from the real viewing distance.
- Scan the QR code on a printed sheet.
- Proofread every word, including the web address, aloud.
What an assistant says about the brand on the poster
A poster sends people to look you up, and more of them now ask an assistant instead of typing a web address. Someone who saw a campaign line on a platform types it as a question: "who is the brand behind the cold chain poster", "what is this company and is it any good". The assistant answers from the pages it can read about you. If your campaign line, name and offer are not stated clearly on your site and profiles, the answer will be vague or point to a similar brand.
Before the campaign runs, ask the main assistants about your brand name and the campaign line, and read what they say. Make sure the web address on the poster leads to a page that matches the poster in wording. AI Knows Us runs this kind of check for a business across ChatGPT, Gemini, Perplexity, Claude and Google AI Overviews, so a printed campaign has an accurate answer waiting for the people it sends to search.
Questions about designing a brand poster
How many words should a poster have?
As few as carry the idea. A headline of a handful of words, one supporting line and the details.
What size should I print?
Choose by viewing distance and location. Bigger for outdoor and distant viewing, smaller for indoor close viewing.
Do I need a designer?
For a campaign, yes. A designer handles hierarchy and print setup, which are the two things that most often go wrong.
Should I use a QR code?
Yes when the next step is online and the code leads to a mobile page. Print it large enough and test it.
How do I check the colors?
Ask for a printed proof. Screens and print differ, and a proof shows the real result.