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RAW Series



Belonging to the ISO 216 standard, A4U is a unique paper size that holds its own in the realm of documentation and printing. This standard, recognized globally, ensures consistency in paper sizes across different countries and industries. The A4U size is an integral part of this series, offering a distinct dimension that caters to specific needs.

The dimensions of A4U are meticulously designed to serve a variety of purposes. Whether it's for professional documents or creative projects, the versatility of A4U makes it an ideal choice for many. Its dimensions provide ample space for content while maintaining a compact form factor that's easy to handle and store.

A4U paper dimensions


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2A046.81 x 66.221189 x 1682119 x 1683370 x 4768
A120.51 x 0.7113 x 181 x 237 x 51
4A066.22 x 93.621682 x 2378168 x 2384768 x 6741
A110.71 x 1.0218 x 262 x 351 x 74
A101.02 x 1.4626 x 373 x 474 x 105
A3+12.95 x 19.02329 x 48333 x 48933 x 1369
A1+23.98 x 35.98609 x 91461 x 911726 x 2591
A0+35.98 x 50.87914 x 129291 x 1292591 x 3662
A64.13 x 5.83105 x 14811 x 15298 x 420
A55.83 x 8.27148 x 21015 x 21420 x 595
A48.27 x 11.69210 x 29721 x 30595 x 842
A311.69 x 16.54297 x 42030 x 42842 x 1191
A91.46 x 2.0537 x 524 x 5105 x 147
A216.54 x 23.39420 x 59442 x 591191 x 1684
A82.05 x 2.9152 x 745 x 7147 x 210
A123.39 x 33.11594 x 84159 x 841684 x 2384
A72.91 x 4.1374 x 1057 x 11210 x 298
A033.11 x 46.81841 x 118984 x 1192384 x 3370

One fascinating aspect about A4U is its aspect ratio. Like all 'A' series paper sizes under ISO 216, when folded in half parallel to its shorter sides, the resulting pages maintain the same aspect ratio as the original page. This unique property allows for seamless scaling between different sizes within the series.

Apart from being part of ISO 216 standard, A4U also aligns with ANSI/ASME Y14.1 which is another widely accepted standard in North America. This dual compatibility further enhances its usability across various geographical locations and industries.

A4U stands as a testament to thoughtful design and international standards compliance - making it not just another paper size but an essential tool in effective communication and documentation.

Other Formats in the RAW Series

Interesting facts about A4U

1: A4U Paper Size

A4U paper is a unique size that falls between the standard A4 and A5 sizes. It measures 148 x 210 millimeters, making it slightly larger than A5 (148 x 210 mm) but smaller than A4 (210 x 297 mm).

2: Origin of the Name

The name "A4U" is derived from the combination of "A" (the international paper size standard) and "U" (representing an unconventional or unique size).

3: Niche Usage

A4U paper is primarily used for specialized purposes such as creating compact brochures, pocket-sized notebooks, or unique marketing materials that stand out from traditional sizes.

4: Limited Availability

Due to its non-standard nature, A4U paper may not be readily available in all stationery stores. It is often produced on-demand or obtained through specialty printing services.

5: Customization Options

A major advantage of A4U paper is its flexibility for customization. Its unconventional size allows for creative designs and layouts that can make a lasting impression on recipients.

6: Compatibility Challenges

Sometimes, using A-size envelopes or folders can be challenging with A-size papers like A5 or A6 due to their different dimensions. However, with the slightly larger dimensions of A6 papers like the A6U, compatibility becomes easier.


The concept of standardized paper sizes originated in Germany during the early twentieth century when Dr. Walter Porstmann proposed a series based on mathematical principles called DIN (Deutsches Institut für Normung). This led to the development of the A series, with A4 becoming the most widely used size globally.

While A4U is not an official standard size, it showcases the ongoing evolution and experimentation within the world of paper sizes and series.