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Japanese Series



Recognized as a unique and historical paper size, Koban is an integral part of the Japanese paper sizing system. Unlike the ISO or ANSI series, which are more prevalent in Western countries, Koban has its roots deeply embedded in Japanese culture and tradition.

Measuring approximately 7.5 x 5.4 inches (190 x 137 mm), Koban is smaller than the standard A4 or Letter sizes familiar to most people. This compact size makes it ideal for applications requiring a more intimate and personal touch, such as handwritten letters or small-scale prints.

Koban 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

The name 'Koban' itself carries significant historical weight. It was originally used to refer to a type of gold coin used during the Edo period in Japan. The dimensions of this coin inspired the dimensions of Koban paper, creating a tangible link between Japan's cultural heritage and its present-day stationery practices.

Despite its traditional origins, Koban has found relevance in modern times too. It's often utilized by artists seeking an unconventional canvas size for their work or by businesses aiming to stand out with distinctive marketing materials.

While not part of any ISO or ANSI series, Koban holds its own unique place within the world of paper sizes. Its rich history combined with its practicality ensures that it continues to be valued both within and beyond Japan's borders.

Other Formats in the Japanese Series

Interesting facts about Koban

1: Origin of Koban Paper

Koban paper, also known as "Kobanashi," originated in Japan during the Edo period (1603-1868). It was named after the small rectangular gold coins called "koban" that were used as currency at that time.

2: Unique Sizing

Koban paper is distinct due to its non-standard size. It measures approximately 7.5 inches by 10.5 inches (19 cm by 27 cm), making it smaller than traditional A4 or letter-sized paper.

3: Traditional Use

Koban paper was traditionally used for woodblock printing and bookbinding in Japan. Its compact size made it ideal for creating small books, illustrations, and prints.

4: Versatile Material

Despite its historical association with woodblock printing, Koban paper is also suitable for various art techniques such as drawing, calligraphy, and watercolor painting.

5: Handmade Craftsmanship

The production of Koban paper involves meticulous handcrafting techniques passed down through generations. Skilled artisans carefully prepare the fibers and use traditional methods to create this unique type of paper.

6: Natural Materials

Koban paper is typically made from renewable plant fibers like kozo (mulberry), mitsumata, or gampi plants. These natural materials contribute to its durability and distinctive texture.

7: Resilient Properties

Koban paper possesses excellent strength and resistance to tearing due to the long fibers used in its production. This makes it suitable for various artistic applications and ensures its longevity.

8: Cultural Significance

Koban paper holds cultural significance in Japan as it is deeply associated with traditional art forms and craftsmanship. It represents the country's rich heritage and artistic legacy.

9: Modern Adaptations

In recent years, Koban paper has gained popularity beyond Japan's borders. Artists worldwide have embraced this unique paper for its aesthetic appeal and versatility in contemporary art practices.

10: Preservation Efforts

To preserve the traditional techniques of Koban papermaking, organizations and artisans in Japan actively promote its production through workshops, exhibitions, and collaborations with artists from different cultures.