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Your Complete Guide to A3 Paper Size For Printing

Creating artwork for an A3 poster or menu? Read on for our comprehensive guide, covering everything you need to know about A3 paper sizes and the dimensions to use when setting up your design files.

What is A3 size commonly used for?

A3 size is a standard paper size that is commonly used for a variety of purposes. In the UK, by far the most common use for A3 paper is for posters. Other popular uses include placemats, menus and folded leaflets as it allows you to position two A4 pages side-by-side. The A3 paper size is also popular in advertising and marketing for printing brochures, flyers and other promotional materials. It is also commonly used for architectural and technical drawings as well as for graphic design projects.

What is A3 size in cm?

The dimensions of A3 paper in centimetres is 29.7 x 42cm. It is important to note that these measurements are based on the International standard ISO 216, which is commonly used in many countries worldwide.

What is A3 size in mm?

The dimensions of A3 paper in millimetres is 297 x 420mm. These measurements are equivalent to the cm measurements and are based on the ISO 216 standard.

What is A3 size in inches?

The dimensions of A3 paper in inches is 11.7 x 16.5". It is important to note that these measurements are based on the American standard, not the ISO 216 standard. And converting between units might have a small effect on the final size

What is A3 size in pixels?

If you're creating artwork for a poster, or indeed anything that will be printed, you should always create it at 300dpi (dots per inch). This will ensure your design reproduces correctly without any visible pixilation. At 300dpi, A3 artwork (without bleed) should be 3508 x 4961 pixels. However, it's important to check with the printer to ensure they accept digital files in pixels and not based on the standard size in cm or mm.

What is the size of A3 with bleed?

Most commercial printing companies request that 3mm bleed is added around each edge of your artwork. This is to allow for small variations in the cutting process and to ensure that there is no white margin around the final product. Therefore A3 size with bleed is generally 30.3 x 42.6cm / 303 x 426mm / 11.9 x 16.8". It's important to check with your printer for their specific bleed requirements.

What size is A3 plus bleed in pixels?

At 300dpi and with a 3mm bleed, you should create your A3 artwork at 3579 x 5031 pixels. This will ensure that your design is print-ready and will reproduce correctly with the correct bleed added.

What size is bigger than A3?

The next size up from A3 is A2. A2 is twice the size of an A3 sheet and is almost exclusively used for posters. A2 measures 42 x 59.4cm / 420 x 594mm / 16.5 x 234". Keep in mind that as you increase in size, your design may need to be adjusted to fit the new dimensions and keep the intended visual impact. The A2 size is also commonly used for architectural and technical drawings, as well as for large format printing such as banners and posters for trade shows and other events.

What size is smaller than A3?

The next size down from A3 is A4. A4 is half the size of an A3 sheet and is commonly used for letterheads, reports and questionnaires. A4 measures 21.0 x 29.7cm / 210 x 297mm / 8.3 x 11.7". The A4 size is also widely used for everyday printing tasks such as correspondence and document creation. Additionally, A4 size is often used for booklets, brochures and flyers


A3 paper size is a versatile and commonly used standard size that can be used for a variety of purposes, including posters, brochures and technical drawings. It's important to keep in mind the dimensions of A3 paper size in cm, mm, inches and pixels, as well as bleed requirements, when creating and printing your design files. By understanding the different dimensions and standards, you can ensure that your artwork is print-ready and will reproduce correctly.