About PrintDPI

PrintDPI exists because the most common question in photo printing — "how big can I print this?" — is answered online by a wall of confident, unsourced numbers. 300 DPI is "required". 150 DPI is "unprintable". Billboards "prove" anything goes. We built this site to replace the folklore with arithmetic and named sources: every quality band on PrintDPI is transcribed from a page a lab or print-industry publisher actually wrote, and every article carries a "Last verified" date.

What you'll find here: a pixels-to-PPI calculator that shows effective resolution on both axes and explains its verdict bands; reference charts for standard print sizes in inches, centimetres and megapixels; and explainers that trace the big conventions honestly — where 300 PPI actually comes from, why viewing distance bends all the rules, and what real labs publish about their own minimums.

Our editorial standard: verify or drop. If a spec page won't load or a number can't be attributed, it doesn't appear on the site. Where credible sources disagree — and on print quality they do — we show the disagreement and name both sides rather than averaging it away. Bands are presented as ranges with attribution, never as physics.

PrintDPI is an independent, English-language reference site. It is not affiliated with any photo lab, printer manufacturer or platform named in its articles; names are cited because they publish their specs publicly. Questions, corrections and spec-change reports are welcome at Vantoron@gmail.com — corrections are how the site stays honest.