6XC

DPI Converter (Pixels ↔ mm ↔ inches)

Convert pixels to millimeters and inches at any DPI — the print-prep question answered: how many pixels is an A4 at 300 DPI?

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Pixels Meet Paper

The bridge is px = inches × DPI = mm ÷ 25.4 × DPI. At 300 DPI (standard offset print), an A4 (210×297 mm) needs 2480×3508 px; a 10×15 cm photo needs 1181×1772. At 150 DPI (large-format posters viewed from distance) the requirements halve; 72-96 DPI is screen territory.

Working backwards works too: a 4000×3000 px photo prints sharp (300 DPI) up to 33.9×25.4 cm. Common DPI targets: 300 for brochures and magazines, 150 for posters, 100-120 for banners/billboards, 600 for fine line art.

Frequently Asked Questions

Is DPI the same as PPI?

Colloquially yes — PPI (pixels per inch) is the correct term for digital images, DPI (dots per inch) for printer dots. Print shops use them interchangeably when specifying file resolution.

Can I just increase the DPI number in Photoshop?

Changing the DPI metadata without resampling only changes the print size, not the detail. Upsampling invents pixels — modest gains at best. The pixel dimensions you shot/exported are the real limit.

What resolution for social media?

Screens ignore DPI entirely — only pixel dimensions matter. Export at the platform's recommended pixel size (e.g. 1080×1350 for a portrait post) and forget the DPI field.

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