Booklet Sizes Explained: A4 vs A5 vs Custom Formats

Booklet Sizes Explained: A4 vs A5 vs Custom Formats

Choosing the right booklet size can significantly impact how your message is received, your printing costs, and how your booklet is used or distributed. In this guide, we’ll explain the most popular booklet sizes — A4, A5, and custom formats — and help you decide which is best for your project. Whether you’re looking for booklet printing in the UK or just want to understand what size to choose, this guide covers everything you need to know.

Why Does Booklet Size Matter?

The size of your printed booklet affects:

    •    Readability and visual flow

    •    Print cost and postage

    •    Paper usage and eco footprint

    •    Binding and finishing options

Smaller sizes are compact and cost-effective, while larger formats offer more space for content and images. Matching size to purpose is key to a successful result.

A4 Booklets – Spacious and Professional

Dimensions: 210mm x 297mm

Best For: School prospectuses, product brochures, portfolios, corporate presentations

A4 is the largest of the standard booklet sizes and ideal for content-heavy projects. You can comfortably fit detailed graphics, charts, and long-form content. It’s also compatible with most office printers, making it a familiar size for readers.

Pros:

    •    Lots of space for text and visuals

    •    Looks professional and clean

    •    Great for showcasing products or company information

Cons:

    •    Higher print and mailing costs

    •    Slightly less portable than A5

A5 Booklets – Compact and Versatile

Dimensions: 148mm x 210mm

Best For: Event programmes, instruction manuals, zines, takeaway menus

A5 booklets are one of the most popular choices for booklet printing in the UK thanks to their balance of space and portability. Half the size of A4, they’re easier to carry and distribute but still provide plenty of room for impactful design.

Pros:

    •    Cost-effective to print and post

    •    Perfect for smaller documents or promotional handouts

    •    Works well with fewer pages (e.g. 8-20 pages)

Cons:

    •    Limited space for detailed layouts

    •    May not suit large images or tables

Custom Booklet Sizes – Bespoke and Attention-Grabbing

Best For: Marketing campaigns, premium catalogues, creative projects

If A4 or A5 doesn’t meet your needs, custom booklet printing is an excellent option. You can specify dimensions that align with your branding or visual goals — for example, square booklets, landscape formats, or tall narrow designs.

Custom sizing also pairs well with specialised binding styles, like wiro-binding or perfect-bound booklets.

Things to consider:

    •    May incur higher printing costs

    •    Can be less standard for mailing or storage

    •    Ideal for standing out in competitive settings

Binding Styles: What Works Best for Each Size?

For most school and business uses, saddle-stitching (stapled on the fold) is sufficient up to 48 pages. For thicker booklets, we recommend perfect binding, especially for A4 and custom sizes.

What GD Print Recommends

At GD Print, we’ve printed thousands of booklets for schools, businesses, and creatives. Here’s what we’ve found works best for our clients:

    •    For smaller documents (4–17 pages), our most popular option is an A5 silk paper booklet (130gsm), offering a professional look with excellent colour reproduction.

    •    For longer booklets, especially above 20 pages, we often recommend cartridge paper, which avoids the bulkiness that can occur with silk.

    •    Custom booklet sizes work best when paired with strong binding and heavier covers — great for premium or artistic projects.

At GD Print we offer all available booklets mentioned here, grab yours today! Need advice? Our expert team is here to help you find the best paper type, size, and finish for your project.

FAQ: Common Questions About Booklet Sizes

1. What’s the best booklet size for mailing?

A5 is typically the most cost-efficient for posting. It fits standard envelopes and is light enough to avoid extra charges.

2. Can I get a square booklet printed?

Yes — we offer a variety of custom sizes, including square and panoramic formats.

3. What size is best for school yearbooks or reports?

A4 is ideal for school documents with lots of photos or text, especially when paired with perfect binding.

4. How many pages can I include in a booklet?

Saddle-stitched booklets work up to 48 pages. Beyond that, we recommend perfect binding for durability and clean presentation.

Need Help with Booklet Printing in the UK?

GD Print offers high-quality booklet printing across the UK, including Bournemouth, Southampton, Poole, and surrounding areas. Whether you need A4, A5, or custom sizes, our team can guide you through every step — from design to delivery.

Call us on 01425 621590 or contact us online to get a free quote or expert advice.