B1 Paper Size
B1 in the Japanese JIS B series is 728 × 1030 mm (28.66 × 40.55 in), half of B0. At 300 DPI it's 8598 × 12165 pixels. It's the B1 size used in Japan for station posters, concert posters and large in-store displays. The international ISO B1 is slightly smaller at 707 × 1000 mm, so confirm which standard your printer works to before you send files.
In Playyy, write “B1, 8,598 × 12,165 px” in your prompt and the design is created at that size at 300 DPI.
Specifications
| Pixels | 8,598 × 12,165 px (at 300 DPI) |
| Millimetres | 728 × 1030 mm |
| Centimetres | 72.8 × 103.0 cm |
| Inches | 28.66 × 40.55 in |
| Aspect ratio | 1:1.414 |
| Colour mode | CMYK |
| Bleed | 3 mm |
| Safe zone | 10 mm from trim |
Design at B1 size with Playyy
Free to start · Watermark-free exports
B1 in Pixels at Different DPI
The pixel count changes with DPI setting — choose the right one for your output.
| DPI | Width (px) | Height (px) | Use |
|---|---|---|---|
| 72 | 2,064 | 2,920 | Screen preview, PDF viewers |
| 96 | 2,751 | 3,893 | Windows screen standard, digital documents |
| 150 | 4,299 | 6,083 | Medium-quality print, home printers |
| 300 | 8,598 | 12,165 | Professional print, commercial offset |
Design Tips
- →For print, design at 300 DPI (8598 × 12165 px) in CMYK with 3 mm bleed on every edge, which makes the working canvas 734 × 1036 mm.
- →B1 shares the 1:√2 ratio of the A series, so a layout built for an A size scales to B1 without cropping — only the type sizes need checking.
- →Japanese print shops and copiers use JIS B, while most of Europe uses ISO B. Name the standard in your print order: JIS B1 is 728 × 1030 mm, ISO B1 is 707 × 1000 mm.
- →Keep text and logos at least 10 mm inside the trim so a slightly off-centre cut leaves them intact.
How to Make B1 Designs in Playyy
Three steps, no design software. Include B1 and 8,598 × 12,165 px in your prompt to set the design size.
- 1
Open Playyy
Playyy runs in your browser, so there's nothing to download. Sign in and you'll land on the Home page.
- 2
Type your prompt and set the B1 size
Describe what you want in the input box on the Home page and include "B1 at 8,598 × 12,165 px, 300 DPI" in your prompt. Playyy uses those dimensions for your design.
- 3
Create your B1 design and export it for print
Playyy generates the design at the full 8,598 × 12,165 px — that's B1 at 300 DPI, the resolution commercial print expects. Allow 3 mm of bleed and export a print-ready PDF. Colour mode: CMYK.
Create B1 designs with Playyy
In Playyy, write “B1, 8,598 × 12,165 px” in your prompt and the design is created at that size at 300 DPI.
Start designing free →Make something at B1
Prepare your image
See it in a workflow
Frequently Asked Questions
What is B1 size in mm?+
B1 is 728 × 1030 mm (72.8 × 103 cm, or 28.66 × 40.55 in) in the Japanese JIS standard. The ISO B1 used internationally measures 707 × 1000 mm. Both keep the same 1:√2 proportions as A-series paper.
What is B1 size in pixels?+
At 300 DPI, JIS B1 is 8,598 × 12,165 px. At 150 DPI it's 4,299 × 6,083 px, and at 96 DPI it's 2,751 × 3,893 px. Use 300 DPI for anything going to a printer and 96 DPI for on-screen documents.
What is B1 paper used for?+
Train-station posters, concert and theatre posters, and large point-of-sale displays. In Japan B1 is a standard stock size, so paper, frames and folders in this size are easy to buy.
What is the difference between JIS B1 and ISO B1?+
JIS B1 (728 × 1030 mm) is the Japanese B size and ISO B1 (707 × 1000 mm) is the international one. Each JIS B size has 1.5 times the area of the A size with the same number, while each ISO B size sits between two neighbouring A sizes. Japanese print shops default to JIS.
How do I make a design in B1 size?+
Open Playyy, describe what you need in the prompt box and add “B1, 8,598 × 12,165 px” to your description. The design is generated at 8,598 × 12,165 px (300 DPI), every element stays editable, and you can export a print-ready PDF. Playyy is free to start.