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Standard Paper Size to Pixels Converter
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A paper size to pixels converter based on the Chinese GB/T 148-1997 standard, supporting DPI calculations for common sizes like A4 and A3.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This page is the China paper-size preset. Choose one of its listed formats, set a resolution in dots per inch (DPI), and read the resulting pixel width and height. It does not accept arbitrary centimeter dimensions: the starting width and height come from the selected preset and are displayed in millimeters.
DPI describes how many image pixels are assigned per inch of physical length. Since one inch is 25.4 millimeters, each pixel dimension is calculated separately and rounded to the nearest whole pixel:
pixels = round((millimeters ÷ 25.4) × DPI)
For example, a listed 210 × 297 mm sheet at 300 DPI gives round(210 ÷ 25.4 × 300) = 2,480 pixels wide and round(297 ÷ 25.4 × 300) = 3,508 pixels high. The pixel count is an output estimate for the selected resolution, not a change to the paper's physical size.
The preset list mixes Chinese book-size names and familiar A-series entries. Select the exact format required by your print job rather than assuming every entry follows the same naming convention.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Select the required Chinese preset by its displayed name and millimeter dimensions. Confirm the dimensions against the job specification or print provider.
Choose a value with the slider or enter DPI directly. Presets include 72, 96, 150, 300, and 600 DPI; the slider covers 72 through 600 in one-DPI increments.
The result reports rounded pixel width and height. Copy the values separately if your design or print workflow requests pixel dimensions.
Keep the physical page size and the pixel canvas distinct: changing DPI changes the pixel counts while the selected millimeter dimensions stay the same.
Use cases
See how the tool fits into real work and everyday tasks.
A designer can select a listed sheet format and DPI to establish pixel dimensions for a document before creating artwork.
A production coordinator can share the resulting width and height with a colleague, while preserving the selected paper name and DPI so the numbers remain interpretable.
A student can reproduce one side of the conversion with millimeters ÷ 25.4 × DPI and see why the final pixel count is an integer.
Q&A
Find concise answers to common questions and confusing cases.
No. This page selects from the listed China paper-size presets. Choose another paper-size converter if your task starts from custom dimensions.
Pixel dimensions are whole-number counts. The calculation rounds each side to the nearest integer after converting the selected millimeter length at the chosen DPI.
No. It increases the pixel count assigned to the same physical dimensions. Whether the image is printed at that size depends on the settings in your design and print workflow.
Notes
Review scope, result limitations, and important precautions before use.
Presets are reference dimensions, and the listed China entries are not a guarantee that a particular supplier or print job uses the same edition or cut size. The national standards registry shows GB/T 148-2026 scheduled to replace GB/T 148-1997 on December 1, 2026. For production work, verify the required format and edition with the print provider; the converter only performs the stated millimeter-to-pixel arithmetic.
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