UK Poster Size & Resolution Guide: Downloadable Templates and Comparison for A0–A5 Prints

Overview

The ISO A-series is the simplest starting point for poster printing because each size keeps the same proportions. A larger number means a smaller sheet: A0 is the largest common size in this guide, while A5 is the smallest. The correct choice depends on viewing distance, available wall or display space, the amount of information on the design and the resolution of the source artwork.

The pixel figures are working guides, not a guarantee of quality. They assume a full-page image at 300 dpi and the dimensions shown in portrait orientation. A landscape file simply reverses the width and height. For a large A0 or A1 poster viewed from a distance, a lower effective resolution may be acceptable, particularly when the file contains vector text and shapes. Fine photographic detail viewed close up benefits from a higher effective resolution. Confirm the production specification before exporting, especially if the printer uses a particular paper, ink set or large-format workflow.

Bleed, trim and safe zones

Finished dimensions describe the trimmed poster, not necessarily the size of the artwork file. If the design has colour, an image or a pattern running to the edge, extend it beyond the trim line. A practical starting point is 3 mm bleed on every side, making the document 6 mm wider and 6 mm taller overall. For example, an A1 portrait file with 3 mm bleed is 600 × 847 mm before trimming.

Keep logos, text, faces and other important details inside a safe zone. A margin of at least 5 mm from the finished edge is a useful starting point; 10 mm or more may be more comfortable for a large poster or a design with a strong border. The printer's template takes priority if its bleed or safety requirements differ.

Reusable template specifications

When creating an A1 poster template in PSD, AI or another design application, set the artboard or canvas to 594 × 841 mm, add 3 mm bleed per edge, and mark an inner safe guide. Repeat the same process for the other A sizes in the table. Include a separate trim guide and label the file with its finished size, orientation and colour profile. A print-ready PDF should normally include the bleed and should not include crop marks unless the production instructions request them.

For custom size poster printing, write down three measurements before designing: finished width, finished height and required bleed. Common custom formats such as 500 × 700 mm, 600 × 900 mm and 700 × 1000 mm can work well for wall art or displays, but they should not be treated as interchangeable with A-series paper. Check the aspect ratio before placing a photograph so that important content is not lost during cropping.

Checklist by scenario

For an A0, A1 or A2 event poster

• Choose the size based on viewing distance and the display area, not only on the available image dimensions.
• Use a clear hierarchy: event name, date, location and call to action should be readable at the expected distance.
• Build the document at the finished size plus the printer's bleed.
• Keep essential text and logos inside the safe zone, away from the trim.
• Use vector text and logos where possible; these remain sharp at large sizes.
• Check small type at 100% viewing size rather than relying only on a zoomed-out screen view.
• Ask whether the venue needs a particular orientation, mounting margin or paper finish.

For photo poster printing

• Check the image's pixel dimensions and its aspect ratio before choosing A0, A1 or A2.
• Crop a duplicate of the image rather than overwriting the original.
• Inspect faces, fine textures, shadows and highlights at 100%.
• Use 300 dpi as a useful target for close-viewed photographic work, while recognising that viewing distance affects the practical requirement.
• Do not enlarge a small image repeatedly. If the source is limited, consider a smaller finished size or a design with generous margins.
• Check whether the image contains embedded colour information and whether the production workflow requires an ICC profile.

For art prints and reproduction work

• Scan or photograph the original evenly, with no glare, skew or clipped highlights.
• Keep a master file separate from the print export.
• Use a high-quality profile supplied for the selected paper and printing process where available.
• Allow for the fact that paper white, texture and finish can change the appearance of colour.
• Consider whether the artwork needs a border. A border can protect important marks from cropping and make framing easier.
• Order or inspect a proof when exact colour matching matters, particularly for art print reproduction.

For business and retail posters

• Confirm the final display location, viewing distance and frame or display system.
• Use one master layout and create separate A0, A1, A2 or custom-size versions instead of stretching one file.
• Check brand colours, contact details, QR codes and legal or product wording.
• Test QR codes from a printed proof or a PDF viewed at realistic size.
• Prepare a clearly named PDF for each size and orientation to reduce ordering errors.

What to double-check

Resolution and effective DPI

DPI describes output density; it does not create missing image detail. A file may show 300 dpi in its document settings but still contain too few pixels for a sharp A0 image. Calculate the effective resolution by dividing the image's pixel width by its printed width in inches, and do the same for height. As a broad workflow guide, aim for around 300 dpi for close-viewed prints, consider around 150 dpi for some large posters viewed farther away, and ask for advice when the image is unusually small or the design will be inspected closely.

Colour management

Colour can change between a screen and a printed sheet. Use the ICC profile recommended for the selected paper and printer when one is provided. If no profile is specified, ask before converting the file. Converting blindly to a generic CMYK profile can produce unexpected results, while leaving an unsupported profile embedded can also cause a mismatch. Keep the original RGB artwork, save a working copy for conversion and review the converted file for muted colours, blocked shadows and altered skin tones.

Export settings and file integrity

Export a PDF using the application's print-quality or press-quality workflow, preserving vector text where practical and embedding fonts or converting final display text to outlines when the workflow requires it. Check that the page size includes the intended bleed, images are not unintentionally downsampled, and transparency effects appear correctly. Avoid sending screenshots, compressed social-media images or a PDF that contains a smaller poster placed on a larger blank page.

A useful final check is to open the exported PDF in a second viewer. Inspect the page dimensions, zoom to 100%, confirm the orientation and look for missing fonts, hairline rules, shifted objects or unexpected white edges.

Common mistakes

• Designing in pixels without checking physical size: a large pixel canvas is not enough unless it is assigned the intended printed dimensions.
• Stretching an A-series design: changing A2 to A1 can alter proportions or make type and images look distorted. Resize proportionally and reposition the layout.
• Putting text in the bleed: backgrounds should extend beyond the trim; important content should not.
• Using a low-resolution logo: replace a web JPEG with a vector logo or a sufficiently large original.
• Adding crop marks automatically: marks can be useful in some workflows but unwanted in others. Follow the supplied file instructions.
• Judging colour from an uncalibrated screen: use profiles and a proof where colour accuracy is important.
• Ignoring the paper: matte, gloss and fine-art papers reflect light differently and can change perceived contrast and saturation.
• Ordering the right artwork at the wrong size: confirm the finished dimensions, quantity, orientation and filename before submitting.

For a broader final review, use the poster printing file setup guide and the poster print proofing checklist. If your file was created in Canva, the Canva export checklist covers the relevant PDF checks.

When to revisit

Return to this checklist whenever you repurpose artwork for a different poster size, change from an A-series format to a custom size, switch paper or request a different print finish. Recheck the printer's accepted formats, bleed, safe zone, colour profile and maximum file size before each new campaign rather than assuming that an old export remains suitable.

It is also worth reviewing the specifications before seasonal planning cycles, exhibitions, retail promotions and recurring events. Production workflows can change when a printer introduces a new paper stock, colour-management profile or printer setup. Templates should be updated at the same time, with clearly labelled files for each finished size and orientation.

Before placing an order, complete this short action list:

1. Confirm the finished width, height and orientation.
2. Choose the correct template and add the required bleed.
3. Keep key content inside the safe zone.
4. Check effective resolution at the intended viewing distance.
5. Apply or request the correct ICC profile for the paper and process.
6. Export the print-ready PDF and inspect its page size, fonts, images and edges.
7. Compare the PDF with the order details, then save the approved file with a clear name.

If the artwork contains a photograph, compare it with the photo poster printing guide. For framing, check the finished dimensions against the intended frame or mount using the UK poster framing guide. Keeping these checks with the working files makes the next A0, A1 or custom poster order faster and less prone to surprises.