- Effective DPI = min(source pixels W ÷ print width in inches, source pixels H ÷ print height in inches). The bottleneck dimension sets the effective DPI.
- Verdict thresholds — 300+ DPI is commercial-print quality; 200–300 is acceptable for most products; 150–200 is large-format only; below 150 is poster-from- distance territory.
- Required source size = target DPI × print dimensions in inches. If your image is below this, you cannot print at the target DPI without upscaling.
- Maximum print size = source pixels ÷ target DPI. Beyond this dimension, the print will drop below the required DPI.
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Free tool
DPI calculator
Calculate effective DPI for any print size. Source pixels, print dimensions, quality verdict — verify image resolution before sending to print.
Your image
Printed size
Target quality
Effective resolution
290DPI
Borderline
Usable for large-format viewed at a distance, but below 300 DPI.
Largest size at 300 DPI203 × 135 mm
Pixels needed for this size2,481 × 1,654 px
FAQ
DPI FAQ
What DPI do I need for print?
The standard is 300 DPI for commercial print (business cards, brochures, packaging, photo prints). Large-format work viewed from distance (posters, banners, trade-show graphics) is typically acceptable at 100–150 DPI. Newspaper and lower-quality reproduction can work at 200 DPI. Below 150 DPI, the print will look visibly pixelated.
What is the difference between DPI and PPI?
DPI (dots per inch) is a print-output measurement — how densely the printer lays ink. PPI (pixels per inch) is a digital-image measurement — how many pixels the source image contains per inch of the final print. They are different units measuring different things, but in practical use they are often used interchangeably because the relationship matters most: your source PPI should match or exceed the printer's required DPI.
How do I know if my image has enough resolution?
Effective DPI = source pixels ÷ print size in inches. A 1500×1000 px image printed at 5×3.33 inches gives 300 DPI — perfect for commercial print. The same image printed at 10×6.67 inches gives only 150 DPI — acceptable for posters, low quality for business cards. The calculator above does this math live.
Can I upscale a low-resolution image?
Traditional upscaling (Photoshop's "bicubic" resize) cannot add detail that is not in the source — it interpolates pixels and produces blurry results. AI-assisted upscaling (Topaz Gigapixel, modern Photoshop Super Resolution) genuinely adds plausible detail and can rescue images up to 4× the original size. Beyond 4×, even AI cannot save it.
What happens if I print below the recommended DPI?
At 200–280 DPI you get visibly soft prints — passable for posters but obvious on business cards. At 100–200 DPI you get noticeable pixelation on close-up products. Below 100 DPI you get genuinely bad output — visible squares, jagged edges, unreadable small type. Most professional printers will warn you below 250 DPI; many refuse to print below 150 DPI without written sign-off.
PrintIntegrator flags low-DPI uploads automatically.
The customer designer warns when an uploaded image is below the required DPI for the configured print size — and offers AI upscaling as an inline fix.
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