Printing Paper Sizes

  1. Understanding standard paper sizes is essential when preparing artwork for professional print. This guide explains the most commonly used dimensions and how they relate to each other under international standards.

    When designing your artwork, please remember that your file must be supplied slightly larger than the finished size to include the required 3mm bleed area around all edges. This allows for precise trimming and prevents unwanted white edges.

    If you are unsure how to set this up, please refer to our Bleed Guide for step-by-step instructions.

    For larger format products, maintaining correct resolution is equally important. Insufficient resolution can result in blurred or pixelated prints when scaled up. Please review our Resolution Guide to ensure your artwork meets print-quality standards.

    ISO216 Standard Overview

    ISO 216 is the internationally recognised standard that defines paper sizes across most of the world, including the UK and Europe. This system ensures consistency in design, printing and reproduction across different platforms, printers and countries.

    ISO 216 is divided into three primary paper size series:

    •  A Series
    • B Series
    • C Series

    Each series follows a consistent mathematical ratio, allowing designs to scale proportionally without distortion.

    For designers, businesses and print buyers, understanding this system helps ensure accuracy, compatibility and professional results.

    A Series Paper Sizes

    The A series is the most widely recognised and commonly used set of paper sizes in commercial printing.

    A4– The Benchmark Size

    A4is the standard office and print size used across the UK. It serves as the reference point for the rest of the A series.

    From this base size, all other A sizes are calculated proportionally.

    How the A Series Scales

    The A series follows a precise scaling principle:

    • A5is exactly half the size of A4
    • A6is half the size of A5
    • A3is double the size of A4
    • A2is double the size of A3
    • A1continues the upward progression
    • A0is the largest size in the series, measuring 841 x 1189mm

    Each time a sheet is halved along its longest side, you move down one size in the series. This logical structure allows artwork to be resized easily while retaining its proportions.

    This makes the A series ideal for:

    The proportional consistency of the A series ensures reliable reproduction across various applications.

    A Series “Strip” Sizes

    In addition to the standard ISO dimensions, there are widely used folded variations known as strip sizes.

    These are created by folding standard A series sheets into three equal horizontal sections.

    Example:

    A4 Strip Size
    When an A4 sheet is divided horizontally into three equal parts, each panel measures:

    420x 148mm

    Strip sizes are particularly popular for:

    They offer a format that is distinctive yet familiar, making them effective for marketing materials that need to stand out while remaining practical.

    Although not officially defined within ISO 216, these sizes are commonly accepted throughout commercial printing.

    B Series Paper Sizes

    The B series maintains the same aspect ratio as the A series, meaning it shares the same proportional relationship between width and height.

    However, the key difference lies in scale.

    Starting Point

    The B series begins with:

    B0,defined with a width of exactly 1 metre.

    Because of this starting dimension, each B series size is slightly larger than its equivalent A series size.

    For example:

    • B4 is larger than A4
    • Each B size sits between two A sizes

    This makes the B series particularly useful when:

    • A design requires slightly more space than a standard A size allows
    • You need a size that sits between two A series dimensions
    • Visual impact and additional layout flexibility are required

    At first glance, A and B sheets appear very similar due to their identical aspect ratios, but the subtle difference in size provides greater versatility in certain print applications.

    C Series Paper Sizes

    The C series was primarily developed to produce envelope sizes designed to accommodate A series documents.

    For example:

    • A4 paper would fit comfortably inside a corresponding C4 envelope.

    While once commonly used, the C series gradually became less relevant for standardised printing and was formally withdrawn from ISO standards in 2009.

    Due to its limited use in modern commercial print production, it is not covered in detail within this guide.

    If you require specific envelope sizing advice, our team will be happy to assist.

    Preparing Your Artwork Correctly

    Regardless of the size you choose:

    Ensure artwork includes a minimum 3mm bleed
    Supply files at correct final dimensions plus bleed
    Use appropriate resolution for larger prints
    Check scaling when resizing between A series formats

    Proper file setup ensures:

    • Clean trimming
    • Accurate scaling
    • Professional presentation
    • No production delays

    At Vegaprint, we’re committed to helping UK businesses produce high-quality print with confidence. If you are unsure which paper size best suits your project, our team is always available to provide expert guidance.