DPI & Print Resolution Calculator

Convert between physical print measurements (inches, cm, mm) and pixel dimensions at 72, 150, 300, or 600 DPI. Calculate and resample images with complete technical transparency.

1. DPI & Dimensions Setup

Drag & drop your image here
or browse, or paste from clipboard (Ctrl+V)
Supports JPG, PNG, WebP

2. Print Output & Dimensions Verification

Configured DPI 300 DPI
Print Size —
Pixel Canvas —
File Size —
Important Technical Clarification: DPI is a print-density factor, not digital screen quality. Changing DPI alone does not magically create additional detail. Client-side canvas export resamples the required pixel density for accurate physical printing.

Upload an image to calculate print resolution

What is DPI and How Does It Relate to Pixels?

DPI (Dots Per Inch) specifies how many individual dots of ink a physical printer places within one linear inch of paper.

The fundamental mathematical relationship between physical print dimensions and pixel count is:

Pixels = Physical Dimensions (inches) × DPI

For example:
• A 2 in × 2 in passport photo printed at 300 DPI requires 600 × 600 pixels.
• A 4 in × 6 in photo print at 300 DPI requires 1200 × 1800 pixels.
• An 8.5 in × 11 in document printed at 300 DPI requires 2550 × 3300 pixels.

Browser Limitations Regarding EXIF/JFIF DPI Headers

The standard browser Canvas API (canvas.toBlob()) writes standard image streams. Some image viewers only inspect internal metadata tags (such as JFIF density tags or EXIF tags). Our tool resamples the canvas pixel dimensions precisely so that your document prints at the exact physical target size when sent to any standard printer.

Frequently Asked Questions

Why is 300 DPI considered the standard for printing?
At typical viewing distances (12–18 inches), the human eye can distinguish approximately 300 distinct dots per inch. Printing at 300 DPI ensures crisp text, sharp edges, and photographic gradation without perceptible dot patterns.
Does a 72 DPI image look worse on a 4K monitor than a 300 DPI image?
On screens, only raw pixel dimensions matter. A 1920×1080 image tagged at 72 DPI and a 1920×1080 image tagged at 300 DPI look 100% identical on every computer monitor and mobile screen.