Chinese National Standard Paper to PX Conversion

Tool Introduction

"Chinese National Standard Paper to PX Conversion" is an efficient and convenient online tool designed to help users accurately convert various paper sizes defined by the Chinese National Standard (GB/T 148-1997) (such as A4, A3, B5, etc.) into pixel (PX) dimensions. Users simply select the paper type and specific size, and input the desired resolution (DPI or PPI) value, and the tool will instantly calculate the width and height pixel values of that paper at the corresponding DPI. This tool is widely applicable to web designers, graphic designers, publishing editors, and any professionals who need to convert physical paper dimensions into digital pixel dimensions, greatly simplifying dimension conversion tasks in design and layout processes.

How to Use

1. Select Paper Series: In the tool interface, first select the paper series you need to convert, such as "A Series" or "B Series".
2. Select Specific Size: Next, choose the specific paper size within that series from the dropdown menu, such as "A4", "A3", "B5", etc.
3. Enter DPI Value: In the DPI (Dots Per Inch) input box, enter the resolution value you wish to use. This should be a positive integer, such as the common 72 DPI (for web), 96 DPI, 150 DPI, or 300 DPI (for printing).
4. Perform Conversion: Click the "Convert" button, and the tool will immediately display the width and height pixel values of the selected paper at the specified DPI.

Input Parameter Format: DPI value must be a positive integer.

Output Result Format: Presented in the form of "Width: XXX px, Height: YYY px".

Usage Example

Suppose you need to design a background image for an A4-sized print, requiring a resolution of 300 DPI.

• Example Input Data:
  • Paper Series: A Series
  • Paper Size: A4
  • DPI Value: 300
• Expected Output Result:

  Select "A Series", choose "A4", enter "300" in the DPI box, and after clicking convert, you will get the following result:

  Width: 2480 px, Height: 3508 px

  (Note: A4 paper physical dimensions are 210mm × 297mm, approximately 8.27 inches × 11.69 inches. 8.27in * 300dpi ≈ 2481px, 11.69in * 300dpi ≈ 3507px. Due to rounding or precision differences, the tool's displayed results may vary slightly but will be within a reasonable range.)

• Specific Operation Demonstration: Users sequentially select A Series, A4 in the tool interface, enter DPI "300", and then click the convert button to see the above pixel values in the result area.

Frequently Asked Questions

• Q: What are National Standard Paper Sizes? A: National Standard Paper Sizes (GB/T 148-1997) are Chinese national standards that specify paper series and specific dimensions, mainly divided into A series (such as A4, A3) and B series (such as B5, B4), all of which have strict millimeter (mm) dimension definitions.
• Q: What is the relationship between DPI and PX? A: DPI (Dots Per Inch) or PPI (Pixels Per Inch) is a unit for measuring image resolution. It indicates how many pixels are contained per inch of physical length. PX (Pixel) is the smallest unit that makes up a digital image. Through DPI, we can convert physical dimensions (inches) into pixel dimensions.
• Q: What are the practical uses of the converted pixel values? A: Converted pixel values are very useful in digital design. For example, they can be used to set canvas sizes in image editors, determine the precise dimensions of image elements on web pages, check if image resolution is sufficient before printing, and ensure consistent display effects of electronic documents on different display devices.
• Q: What DPI should be chosen for different uses? A: The choice of DPI depends on the final use. Generally, images for web display or screen viewing usually choose 72 DPI or 96 DPI; images for professional printing (such as magazines, posters) usually require 150 DPI to 300 DPI, or even higher; large-format printing may require lower DPI, while high-precision photo printing requires higher DPI.

National Standard Paper Size Standard

The Chinese National Standard GB/T 148-1997 "Paper Sizes" references the international standard ISO 216, defining A series and B series paper. These standards ensure the uniformity of paper sizes, facilitating international communication and use.

• A Series Paper:
  • A0 has an area of 1 square meter, with an aspect ratio of 1:√2.
  • Each subsequent size (such as A1, A2, A3, A4, etc.) is obtained by folding the previous size along its longer side, so the area is half of the previous size, and the aspect ratio remains unchanged.
  • Common sizes: A4 (210mm × 297mm), A3 (297mm × 420mm), etc.
• B Series Paper:
  • B series paper sizes are between adjacent A series sizes. For example, the area of B1 is between A0 and A1.
  • B0 has a short side length of 1 meter, an area of √2 square meters, and an aspect ratio also of 1:√2.
  • Common sizes: B5 (176mm × 250mm), B4 (250mm × 353mm), etc.

This tool is based on these precise physical dimension data, combined with the DPI value, to perform pixel conversion, ensuring the accuracy of the conversion results.

Notes

• When entering the DPI value, please ensure it is a positive integer. Incorrect DPI values will lead to erroneous calculation results.
• This tool calculates based on the standard paper size data provided by the Chinese National Standard GB/T 148-1997. If your paper size has non-standard deviations, the conversion results may vary slightly.
• The conversion result is a theoretical pixel value. When actually displayed or printed in different software (such as Photoshop, Word) or devices (monitors, printers), slight visual differences may occur due to software processing, screen resolution, printer accuracy, and other factors.
• For scenarios requiring extremely high precision or for professional printing, it is recommended to perform small-scale test prints or previews before actual production to ensure that the final effect fully meets your expectations.