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Paper by size

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Paper by size is a category covering standard sheet formats designed for printers, printing equipment and specific applications. Netuno offers A4 paper, A3 paper, A5 paper, as well as professional printing formats such as SRA3, large-format B1, B2 and C1 sheets, and special formats.

Are you looking for A4 printer paper? Do you need A3 paper for posters? Or perhaps SRA3 paper for full-bleed offset printing? As a Polish manufacturer, we offer all popular formats in a wide range of grammages, colours and paper types - including offset, decorative, coloured and coated paper.

Which paper size should you choose? It depends on the final project and the equipment being used. A4 is the universal office standard, A3 is suitable for posters and presentations, while SRA3 is used for professional printing with additional margins for trimming. Larger formats, such as B1, B2 and C1, are designed for offset printing companies and large-format projects.

All paper formats are available immediately. Dispatch within 24 hours. Expert advice on selecting the right format for your project.

What paper sizes do we offer?

Paper size defines the dimensions of a sheet in millimetres or centimetres. Standard formats are identified by letters and numbers - the A series is the most popular, the B series covers intermediate sizes, and the C series is used for envelopes. Which paper size should you choose? It depends on the printing device, the final project and the intended use.

A Series - The Most Popular Paper Sizes

The A series is based on the international ISO 216 standard and includes the most commonly used formats in offices, printing companies and schools.

A-Series Aspect Ratio

A-series formats are based on the 1:√2 ratio (1:1.414). Each smaller format is created by cutting the larger one in half. A0 (841x1189 mm) is the starting point and has an area of 1 m². A1 is half of A0, A2 is half of A1, and so on. This ratio ensures that scaling does not distort the proportions - an A4 design enlarged to A3 retains the same shape. The system is remarkably simple and practical.

Popular A-Series Sizes

The most popular formats are A4 (210x297 mm) - the universal office and printer standard, A3 (297x420 mm) - used for posters and diagrams and equal to twice the size of A4, A5 (148x210 mm) - used for leaflets and notebooks and equal to half of A4, and A6 (105x148 mm) - used for postcards and small invitations and equal to one quarter of A4. Larger formats include A2 (420x594 mm) - for medium-sized posters and presentations, A1 (594x841 mm) - for large posters and technical drawings, and A0 (841x1189 mm) - for large-format posters, maps and architectural diagrams.

SRA Series - Printing Formats with Additional Margins

The SRA series consists of printing formats that are larger than the standard A sizes and provide extra space for trimming and bleed.

What Is the SRA Format?

SRA stands for Supplementary Raw Format A. It is approximately 2 cm larger on each side than the corresponding A-series format. SRA3 (320x450 mm) is the most popular size - it is used to print an A3 design (297x420 mm) with additional bleed margins. After trimming, the result is a clean A3 sheet printed to the edge without white borders. It is a standard format in offset and digital printing companies producing premium printed materials.

When Should the SRA Format Be Used?

The SRA format is used when a project requires full-bleed printing - for example, leaflets, business cards, invitations and covers without white borders. The graphic designer prepares the artwork in the target format, such as A4, with an additional 3-5 mm bleed. The printing company prints it on SRA4 and, after drying, trims it to the final A4 size. Without SRA formats, professional borderless printing is not possible, as standard A-series sheets leave white margins around the edges.

B Series - Intermediate Formats

The B series consists of intermediate sizes between A-series formats. They are less common but useful for specific applications.

Characteristics of the B Series

B-series formats are based on the geometric mean between A-series sizes. B1 (707x1000 mm) falls between A0 and A1, B2 (500x707 mm) falls between A1 and A2, and so on. The 1:√2 aspect ratio is maintained. The B series is used mainly in large-format printing for posters, banners and outdoor advertising. These formats are popular in continental Europe but less common in Poland. They are available from offset printing companies on request.

Applications of B-Series Formats

B1 is used for citylight posters in illuminated advertising displays, medium-sized street posters and event presentations. B2 is suitable for indoor posters, infographics and conference presentations. B-series formats are popular in Germany, Austria and Switzerland, where they are commonly used for urban advertising posters. In Poland, A-series formats are more widely used, but printing companies also support B-series formats for international customers.

C Series - Envelope Sizes

The C series consists of formats designed for envelopes. They accommodate A-series paper sizes without folding or with minimal folding.

C-Series Envelope System

A C4 envelope (229x324 mm) holds an A4 sheet without folding. A C5 envelope (162x229 mm) holds an A5 sheet without folding or an A4 sheet folded in half. A C6 envelope (114x162 mm) holds an A6 sheet without folding or an A4 sheet folded into quarters. The system is carefully designed - each C[n] envelope fits an A[n] sheet or a larger sheet after folding. This eliminates the difficulty of matching an envelope to a document.

Envelopes and Paper Sizes

Standard office correspondence usually consists of an A4 sheet placed in a C4 envelope without folding or in a C5 envelope after being folded in half. A6 invitations fit C6 envelopes, while A5 catalogues fit C5 envelopes. The C-series format is always selected to match the A-series size of the document, ensuring an attractive appearance, practical use and easy packing. Netuno offers paper in A-series formats, while C-series envelopes are available separately in the envelope category.

A4 Paper - The Universal Standard

A4 (210x297 mm) is the most popular paper size in the world. It is the standard format for offices, homes and education.

A4 Paper - Format Characteristics

A4 is the foundation of everyday paper use.

A4 Dimensions and Applications

A4 paper measures 210x297 mm (width x height) and has an area of approximately 0.062 m². It is a universal format compatible with virtually every office printer, home photocopier, scanner, shredder, binder and folder. A4 is the standard size for documents such as contracts, invoices, reports, CVs, cover letters, presentations and notes. It is also widely used in education for worksheets, tests, essays and homework. In marketing, A5 leaflets are often created by folding an A4 sheet in half.

A4 Paper in Different Grammages

A4 paper is available in grammages ranging from 80 to 300 g/m². The most common option is 80 g/m² - economical copier and office paper. Grammages of 100-120 g/m² are suitable for more important documents and lightweight certificates. Grammages of 160-200 g/m² are used for leaflets, home-made invitations and cards. Grammages of 250-300 g/m² are suitable for business cards cut from A4 sheets, premium invitations and heavyweight certificates. A4 is a highly versatile format, with every grammage available across all major paper types, including offset, coloured, decorative and coated paper.

Which A4 Paper Should You Choose?

The choice of A4 paper depends on its intended use and the printing device.

A4 Printer Paper

A4 printer paper is most commonly 80 g/m² white offset paper. It is universal, economical and compatible with all types of printers, including inkjet and laser printers. It is usually packed in reams of 500 sheets. For colour printing, 100-120 g/m² white coated A4 paper provides better colour reproduction. For double-sided printing, a minimum grammage of 90 g/m² is recommended, as thinner paper may show through. Coloured 80 g/m² A4 paper is useful for visually organising and categorising documents.

Coloured A4 Paper

Coloured A4 paper is available in a full range of shades, including pastel, intense, neon and dark colours. Available grammages range from 80 to 250 g/m². Typical applications include coloured leaflets folded to A5, greeting cards, home-made invitations cut to A6, arts and crafts, DIY projects and office document organisation using colour coding for different departments. A4 is the most popular format for coloured paper because of its versatility.

A3 Paper - For Larger Projects

A3 (297x420 mm) is twice the size of A4. It is a standard format for posters, diagrams and presentations.

A3 Paper - Format Characteristics

A3 is the first standard format that requires a specialist printer.

A3 Dimensions and Applications

A3 paper measures 297x420 mm and has an area of approximately 0.125 m² - exactly twice the size of A4. It requires an A3-compatible printer, as most home printers support only A4. It is widely used in design offices, advertising agencies, art schools and architectural studios. Typical applications include A3 posters, technical diagrams, architectural drawings, visual presentations, A4 leaflets folded from A3 sheets and A4 catalogues printed on A3, then folded and bound.

A3 Paper in Printing

In printing companies, A3 paper is used for indoor posters, large restaurant menus, sales presentations, infographics and assembly diagrams. The grammage depends on the application - 120-170 g/m² for short-term posters and 200-300 g/m² for durable menus and reusable presentations. Gloss-coated A3 paper is the most popular choice for photographic posters because it provides vivid colours and sharp print quality.

Which A3 Paper Should You Choose?

A3 paper is less commonly available in retail and is mainly sold wholesale to businesses.

A3 Offset Paper

White A3 offset paper in grammages of 80-120 g/m² is the standard choice for technical printing, including diagrams, CAD drawings and business presentations. It is usually packed in reams of 250 sheets, which are heavier than A4 reams. It is compatible with A3 laser and inkjet printers. For double-sided printing, a minimum grammage of 100 g/m² is recommended, as 80 g/m² paper shows through more noticeably in the larger A3 format than in A4.

Coloured and Decorative A3 Paper

Coloured A3 paper is available in popular shades, although the range is smaller than for A4 due to lower demand. Available grammages range from 80 to 250 g/m². Typical applications include coloured posters, presentation backgrounds and decorative backing sheets. Decorative A3 paper, such as pearlescent or metallic paper, is less common and is usually produced to order for printing companies. A3 is mainly an office format and is used less often for creative projects than A4.

A5 Paper - Compact and Convenient

A5 (148x210 mm) is half the size of A4. It is a standard format for notebooks, leaflets and small brochures.

A5 Paper - Format Characteristics

A5 offers a practical balance between functionality and compact size.

A5 Dimensions and Applications

A5 paper measures 148x210 mm and has an area of approximately 0.031 m² - half the size of A4. It is a convenient format to hold and is widely used for catalogues, brochures, notebooks and folded leaflets. It fits easily into a handbag, jacket pocket or document folder. Typical applications include advertising leaflets made by folding or cutting A4 sheets, compact catalogues, small restaurant menus, branded notebooks, notepads and folded invitations.

A5 Paper in Printing

In printing companies, A5 sheets are produced by cutting A4 paper in half or by printing four A5 leaflets on an SRA3 sheet. This is economical for larger print runs because it optimises paper use. The grammage depends on the application - 120-170 g/m² for leaflets, 200-300 g/m² for catalogue covers combined with 115-150 g/m² for the inner pages, and 80-100 g/m² for notebooks containing many sheets. Gloss-coated A5 paper is popular for product catalogues featuring photographs.

Which A5 Paper Should You Choose?

A5 paper is rarely sold as a ready-made format - it is more common to buy A4 sheets and cut them in half.

A5 Paper for Leaflets

A5 leaflets are a standard format in the advertising industry - convenient, economical and practical. A grammage of 120-170 g/m² provides sufficient stiffness without making the leaflet excessively thick. Gloss-coated paper in grammages of 135-170 g/m² is the most popular choice because it produces vivid, eye-catching colours. Offset or digital printing is used depending on the print run, with offset printing generally becoming more economical for quantities above 500 copies. A5 leaflets are often varnished or laminated for added protection and shine.

A5 Paper for Notebooks

A5 notebooks are a convenient format for taking notes - compact enough to fit in a folder, yet large enough for comfortable writing. A5 notepads are usually made from 80-100 g/m² white or cream offset paper, with cream paper being easier on the eyes. A5 notebook covers are typically made from 200-300 g/m² paperboard, providing protection, stiffness and space for branding. Branded A5 notebooks with a logo on the cover are a popular promotional item.

SRA3 Paper - A Format for Professionals

SRA3 (320x450 mm) is a professional printing format larger than A3, providing additional space for trimming.

SRA3 Paper - Why Is a Larger Format Needed?

SRA3 is essential for professional printing without white margins.

SRA3 Dimensions and Principle

SRA3 paper measures 320x450 mm. It is 23 mm wider and 30 mm longer than A3 (297x420 mm). The additional space provides a bleed margin, allowing the artwork to extend 3-5 mm beyond the final format. After printing, the sheet is trimmed to a clean A3 size printed all the way to the edge without white borders. SRA3 is a standard format in offset and digital printing companies producing premium materials such as business cards, invitations, leaflets and covers without margins.

Why A3 Cannot Be Printed to the Edge

Printers and offset presses cannot print perfectly to the edge of a sheet. A 2-5 mm unprinted margin is always left because of paper grippers and mechanical limitations. Printing directly on A3 would therefore leave white borders around the finished product. SRA3 solves this problem by allowing the design to be printed with bleed on a larger sheet and then trimmed to A3. The result is a clean A3 print without white edges - the professional standard.

Which SRA3 Paper Should You Choose?

SRA3 paper is designed for printing companies and is not supported by standard office printers.

SRA3 Offset Paper

SRA3 offset paper in grammages from 80 to 300 g/m² is a standard material for offset printing. It is used when a project must be trimmed to A3 or a smaller final format - for example, posters, A4 leaflets arranged four to an SRA3 sheet, and business cards arranged in larger quantities on one sheet. Printing companies purchase SRA3 paper by the pallet, often in quantities of thousands of sheets. The grammage depends on the final product. SRA3 can reduce the cost per finished item compared with smaller formats due to economies of scale.

Coated and Decorative SRA3 Paper

Gloss or matt coated SRA3 paper is used for leaflets, catalogues and premium covers with full-bleed printing. Decorative SRA3 paper, including pearlescent, metallic and textured varieties, is used for invitations and premium business cards cut from a larger sheet. Printing on decorative SRA3 paper requires suitable technology - either offset printing with specialist inks or digital printing with toner that adheres effectively to coated surfaces.

A6 Paper - The Smallest Popular Format

A6 (105x148 mm) is one quarter of A4. It is a standard format for postcards, small invitations and flashcards.

A6 Paper - Format Characteristics

A6 is a compact format ideal for correspondence and small printed materials.

A6 Dimensions and Applications

A6 paper measures 105x148 mm and has an area of approximately 0.016 m² - one quarter of A4. It fits easily in the hand, a pocket or a small envelope. Typical applications include postcards, small invitations for birthdays and name days, folded greeting cards, educational flashcards, pocket notes, large labels and oversized non-standard business cards. A6 is an economical format, as four A6 sheets can be cut from one A4 sheet, helping to optimise paper use.

A6 Paper in Printing

In printing companies, A6 sheets are produced by cutting A4 paper into four pieces or by printing multiple A6 items on an SRA3 sheet. The grammage depends on the application - 250-300 g/m² for postcards, which need to remain stiff during transport, 200-250 g/m² for invitations, and 200 g/m² for flashcards that must withstand frequent use. Coloured A6 paper is popular for postcards and is available in a full range of shades.

Which A6 Paper Should You Choose?

A6 paper is rarely sold as a ready-made format - A4 sheets are usually purchased and cut into quarters.

A6 Paper for Postcards

A6 is the standard postcard format - it is accepted by postal services and is convenient for writing and mailing. A minimum grammage of 250 g/m² is recommended, as thinner paper bends easily and may look inexpensive. Gloss-coated 300 g/m² paper is the most popular choice, providing high-quality full-colour photographic printing and vivid colours, with optional lamination. A6 postcards are typically printed on SRA3 sheets, cut individually and packed in film or boxes.

A6 Paper for Invitations

A6 invitations are a compact option suitable for home birthday parties, name-day celebrations and small events. A grammage of 200-250 g/m² provides sufficient stiffness without making the invitation excessively thick. Smooth coloured or decorative paper, including pearlescent and metallic varieties, is a popular choice. A6 invitations are often folded in half to create a 105x74 mm format with the text printed inside. They are also economical, as four invitations can be produced from one A4 sheet.

Large-Format Paper - B1, B2, C1 and C2

Large-format paper sizes include B1, B1+, B2, C1 and C2. They are used by offset printing companies for posters, banners and other large printed materials.

B1 and B1+ Paper - Large Printing Formats

B1 measures 707x1000 mm, while B1+ measures 720x1020 mm. These formats are used for citylight posters and outdoor advertising materials.

Characteristics of the B1 Format

B1 paper (707x1000 mm) is an intermediate format between A0 and A1 in the ISO system. It has an area of approximately 0.7 m². B1+ (720x1020 mm) is an extended version of B1 with additional space for trimming. It is used for citylight posters in illuminated 70x100 cm street displays, outdoor posters, event banners and trade fair presentations. B1 is popular in Western Europe but less common in Poland, where A-series formats are more widely used.

Applications of B1 Paper

B1 offset paper in grammages of 115-150 g/m² is used for citylight posters produced in large offset print runs. B1 coated paper in grammages of 150-200 g/m² is suitable for premium photographic posters for museums, galleries and cultural events. B1 can also be used for paper banners, which are less common than vinyl banners but offer a more environmentally friendly alternative. B1 offset presses are specialist machines with a high initial investment cost, but they provide a low unit cost for large print runs.

B2, C1 and C2 Paper - Special Formats

B2, C1 and C2 are less common formats intended for specialist applications.

B2 Format

B2 paper (500x707 mm) is half the size of B1. It is used for medium-sized posters, conference presentations and large-format infographics. It is less common than A-series paper but appears more frequently in international projects, particularly for German and Austrian clients. It is available to order from offset printing companies. Typical grammages are the same as for B1 - 115-200 g/m², depending on the application.

C1 and C2 Formats

C1 paper (648x917 mm) and C2 paper (458x648 mm) theoretically correspond to envelope formats in the ISO system. In practice, they are rarely used as printing paper. The C series is mainly intended for envelope production - C1 and C2 envelopes are designed for very large documents, such as folded posters and architectural drawings. As printing paper, these formats are virtually unavailable and are supplied only for niche applications or by special order.

A1 and A2 Paper - Poster Formats

A1 and A2 are standard formats for posters, architectural plans and technical drawings.

A1 Paper - A Large Technical Format

A1 (594x841 mm) is a professional format used by large-format printing companies and design offices.

A1 Dimensions and Applications

A1 paper measures 594x841 mm and has an area of approximately 0.5 m² - half a square metre. It is used for large posters, architectural drawings, technical diagrams, trade fair presentations, large-format infographics and maps. It requires a plotter or large-format printer, as standard office printers do not support A1. This format is popular with architectural practices, engineering companies and advertising agencies.

A1 Paper for Different Applications

A1 offset paper in grammages of 80-120 g/m² is used for technical drawings, including construction plans, installation diagrams and architectural designs. Gloss-coated A1 paper in grammages of 135-200 g/m² is suitable for photographic advertising posters for events, promotions and product presentations. Gloss photo paper in the A1 format, usually 180-260 g/m², is used for photographic reproductions, exhibitions and galleries. A1 printing is carried out using large-format offset or digital UV printing, depending on the print run.

A2 Paper - An Intermediate Poster Format

A2 (420x594 mm) is half the size of A1 and twice the size of A3.

A2 Dimensions and Applications

A2 paper measures 420x594 mm and has an area of approximately 0.25 m² - one quarter of a square metre. It is an intermediate format between A3, which may be too small for a poster, and A1, which may be too large for many applications. A2 is used for indoor posters, sales presentations, infographics, medium-sized diagrams and large restaurant menus. It requires an A2-compatible plotter or printer, which is less common than A3 equipment but more widely available than A1 equipment.

A2 Paper - Choosing the Right Grammage

A2 offset paper in grammages of 100-150 g/m² is suitable for temporary presentations used at meetings, conferences and training sessions. A2 coated paper in grammages of 150-200 g/m² is used for more durable posters, including indoor campaigns and permanent displays. A2 photo paper above 200 g/m² is suitable for artistic reproductions and gallery presentations. A2 paper usually requires a higher grammage than smaller formats because the larger sheet needs sufficient stiffness to prevent it from curling under its own weight.

Other Paper Sizes - Non-Standard Formats

In addition to ISO formats, non-standard sizes are available for special orders and unique projects.

Non-Standard Formats - When to Use Them

Standard formats do not always suit a project, in which case a custom size may be the best option.

Square Formats

Square paper sizes, such as 210x210 mm, 300x300 mm and 500x500 mm, are popular for designer invitations, art catalogues, photo albums and premium packaging. A square format stands out because most printed materials are rectangular. These formats are produced from standard sheets with some material waste or cut to size on request. They are more expensive than standard formats because of the higher level of material waste.

Panoramic Formats

Panoramic paper sizes, such as 100x210 mm DL and 99x210 mm, which is one third of A4, are used for panoramic folded leaflets, long invitations and narrow menus. The DL format, with a length of 210 mm, is the standard size for long envelopes, allowing a DL leaflet to fit without folding. It can be cut economically from A4 paper, with three DL leaflets produced from one A4 sheet.

Custom Formats Made to Order

Any paper size can be produced to order by cutting it from larger sheets. Limitations depend on the maximum size supported by the machine, typically 70x100 cm for offset presses and up to 160 cm for plotters. The minimum order quantity depends on the format and the amount of material waste. Custom sizes are worth considering for unique projects, as the format itself can strengthen branding and distinguish a product from its competitors.

Sources

The information included in this description is based on:

  • ISO 216:2007 - Writing paper and certain classes of printed matter - Trimmed sizes - A and B series
  • ISO 217:2013 - Paper - Untrimmed sizes - Designation and tolerances for primary and supplementary ranges
  • PN-EN ISO 536:2020 - Paper and board - Determination of grammage
  • Kipphan, H. (2001). Handbook of Print Media. Springer-Verlag
  • Johansson, K. et al. (2003). A Guide to Graphic Print Production. John Wiley & Sons
  • Technical specifications provided by printing press manufacturers
  • Netuno's many years of production experience across different paper formats
  • Analysis of cutting optimisation and format economics in printing companies, 2020-2025

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