JIS Paper to Pixels Converter

JIS Paper to Pixels Converter: Core Features and Principles

When designing digital content, do you ever struggle to match physical paper sizes with screen pixels? This tool is specifically designed to convert Japanese JIS standard paper sizes into pixels. By inputting the paper size (such as A4 or B5) and the target DPI, it accurately outputs the corresponding width and height in pixels. JIS paper sizes are printing standards defined by the Japanese Industrial Standards. The A series is identical to the international ISO 216 standard, while the B series has an area 1.5 times that of the A series (for example, JIS B4 is 257 × 364 mm). The conversion is based on the formula: Pixels = Physical Size (mm) ÷ 25.4 × DPI, with the result rounded to the nearest whole pixel.

Why Choose Our JIS Paper to Pixels Converter?

Strict adherence to JIS standards: Accurately distinguishes between A and B series dimensions, applying the 1.5x area ratio for the B series instead of the √2 ratio used in ISO standards.
Flexible DPI support: Allows you to enter any positive integer for DPI (e.g., 72, 96, 300) to suit both screen and print scenarios.
Instant calculation with dual outputs: Returns both width and height in pixels simultaneously, eliminating the need for manual calculations.

How to Use This Tool

Select the JIS paper series (A or B series) from the dropdown menu.
Choose the specific size designation (e.g., A4, B5).
Enter the DPI value in the input field (e.g., 96 or 300).
Click the "Convert" button to get the pixel dimensions.

Frequently Asked Questions (FAQ)

Q: What is the difference between JIS B series and ISO B series sizes?
A: The area of the JIS B series is 1.5 times that of the A series, whereas the ISO B series is √2 times larger. For example, JIS B4 is 257 × 364 mm, while ISO B4 is 250 × 353 mm.

Q: What are the pixel dimensions of JIS A4 paper at 96 DPI?
A: 794 × 1123 pixels. The calculation is: 210 mm ÷ 25.4 × 96 ≈ 794 px, and 297 mm ÷ 25.4 × 96 ≈ 1123 px.

Important Notes

The DPI value directly affects the accuracy of the results; it is recommended to set it based on your device's actual PPI. Pixel values are rounded to the nearest integer, so manual verification may be required for extremely high-precision needs. This tool does not store any DPI or size data entered by users.

Technical Notes & Recommendations

For web design, 96 DPI is recommended as a baseline, though modern high-resolution screens may have a higher actual PPI. For printing, 300 DPI is recommended to ensure high output quality. A typical example: JIS A4 paper at 300 DPI outputs at 2480 × 3508 pixels, which is ideal for print layouts.