A4/A3 DPI & Pixel Calculator
Work out the exact pixel dimensions you need for A4, A3 and other print sizes, with portrait or landscape orientation and any supported DPI.
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How to use this tool
Work out the exact pixel dimensions you need for A4, A3 and other print sizes, with portrait or landscape orientation and any supported DPI.
How to calculate paper size in pixels
Multiply each millimetre dimension by your desired DPI, then divide by 25.4. The result is rounded to the nearest whole pixel. For A4 portrait at 300 DPI, the result is 2480 × 3508 pixels.
What is the difference between DPI and PPI?
DPI refers to printer dot density, while PPI refers to raster image pixels per inch. This calculator estimates the pixel dimensions of an image prepared for a selected print density.
Does this tool resize my uploaded photo?
No. It computes target dimensions. For actual image resizing, use Docvelio’s Image Studio or resize tool.
Reference: Official specifications and background. Results should be independently checked when used for payments, production or logistics.