B4 Paper Size
B4 in the Japanese JIS B series is 257 × 364 mm (10.12 × 14.33 in), half of B3. At 300 DPI it's 3035 × 4299 pixels. It's the B4 size used in Japan for flyers, newspaper inserts and drawing paper. The international ISO B4 is slightly smaller at 250 × 353 mm, so confirm which standard your printer works to before you send files.
In Playyy, write “B4, 3,035 × 4,299 px” in your prompt and the design is created at that size at 300 DPI.
Specifications
| Pixels | 3,035 × 4,299 px (at 300 DPI) |
| Millimetres | 257 × 364 mm |
| Centimetres | 25.7 × 36.4 cm |
| Inches | 10.12 × 14.33 in |
| Aspect ratio | 1:1.414 |
| Colour mode | CMYK |
| Bleed | 3 mm |
| Safe zone | 5 mm from trim |
Design at B4 size with Playyy
Free to start · Watermark-free exports
B4 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 | 728 | 1,032 | Screen preview, PDF viewers |
| 96 | 971 | 1,376 | Windows screen standard, digital documents |
| 150 | 1,518 | 2,150 | Medium-quality print, home printers |
| 300 | 3,035 | 4,299 | Professional print, commercial offset |
Design Tips
- →For print, design at 300 DPI (3035 × 4299 px) in CMYK with 3 mm bleed on every edge, which makes the working canvas 263 × 370 mm.
- →B4 shares the 1:√2 ratio of the A series, so a layout built for an A size scales to B4 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 B4 is 257 × 364 mm, ISO B4 is 250 × 353 mm.
- →Keep text and logos at least 5 mm inside the trim so a slightly off-centre cut leaves them intact.
How to Make B4 Designs in Playyy
Three steps, no design software. Include B4 and 3,035 × 4,299 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 B4 size
Describe what you want in the input box on the Home page and include "B4 at 3,035 × 4,299 px, 300 DPI" in your prompt. Playyy uses those dimensions for your design.
- 3
Create your B4 design and export it for print
Playyy generates the design at the full 3,035 × 4,299 px — that's B4 at 300 DPI, the resolution commercial print expects. Allow 3 mm of bleed and export a print-ready PDF. Colour mode: CMYK.
Create B4 designs with Playyy
In Playyy, write “B4, 3,035 × 4,299 px” in your prompt and the design is created at that size at 300 DPI.
Start designing free →Make something at B4
Prepare your image
See it in a workflow
Frequently Asked Questions
What is B4 size in mm?+
B4 is 257 × 364 mm (25.7 × 36.4 cm, or 10.12 × 14.33 in) in the Japanese JIS standard. The ISO B4 used internationally measures 250 × 353 mm. Both keep the same 1:√2 proportions as A-series paper.
What is B4 size in pixels?+
At 300 DPI, JIS B4 is 3,035 × 4,299 px. At 150 DPI it's 1,518 × 2,150 px, and at 96 DPI it's 971 × 1,376 px. Use 300 DPI for anything going to a printer and 96 DPI for on-screen documents.
What is B4 paper used for?+
Flyers and newspaper inserts, sketchbooks, and folders that hold B5 documents. In Japan B4 is a standard stock size, so paper, frames and folders in this size are easy to buy.
What is the difference between JIS B4 and ISO B4?+
JIS B4 (257 × 364 mm) is the Japanese B size and ISO B4 (250 × 353 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 B4 size?+
Open Playyy, describe what you need in the prompt box and add “B4, 3,035 × 4,299 px” to your description. The design is generated at 3,035 × 4,299 px (300 DPI), every element stays editable, and you can export a print-ready PDF. Playyy is free to start.