Image quality checker

Drop a photo to get a quick technical read on it: its pixel dimensions, megapixels, file size, how large it can print at a couple of common resolutions, and a rough estimate of how sharp or soft it looks.

  • Free
  • No sign-up
  • Runs in your browser
image-quality-checker

How it works

Drop your photo

Any image.

Read the numbers

Dimensions, megapixels, file size, print size.

Check the sharpness estimate

A rough read on whether it looks crisp or soft.

A quick technical read before you use a photo

Before printing a photo, submitting it for something with resolution requirements, or just deciding whether it's good enough to use, it helps to see the numbers behind it rather than guess from how it looks on a small screen. This tool reads a photo's pixel dimensions, works out its megapixel count, and shows the print size it supports at two common resolutions.

The sharpness estimate

Alongside the numbers, a rough sharpness estimate looks at how much contrast exists at edges throughout the image — a genuinely sharp photo has lots of it, a blurry or heavily softened one has very little. This is a useful early warning, not a precise measurement, so always check the full-size image yourself before anything important rides on it.

Reading the print sizes

300 DPI is the standard for sharp, up-close prints; 150 DPI is generally fine for a poster or banner seen from a distance. If your photo's print size at 300 DPI is smaller than what you actually need, printing it larger than that will start to show softness or visible pixels.

Megapixels versus file size

A high megapixel count and a large file size don't always go together: a heavily compressed image can have plenty of pixels but little real detail left in them, while a modestly sized file saved with light compression can still hold up well. Looking at dimensions, file size and the sharpness estimate together gives a much fuller picture than any single number on its own.

Privacy

Your photo is analyzed entirely in your browser. Nothing is ever uploaded.

Frequently asked questions

What does this tool check?
Pixel dimensions, megapixels, file size, the print size supported at 300 and 150 DPI, and a rough sharpness estimate.
How accurate is the sharpness estimate?
It's a rough, automated estimate based on edge contrast, useful as an early warning, not a definitive measurement — always check the full-size image yourself for anything important.
What DPI should I aim for when printing?
300 DPI for sharp, close-up prints; 150 DPI is usually enough for a poster or banner viewed from a distance.
Why does my photo look fine on screen but might print blurry?
A screen shows far fewer pixels than a large print needs; an image can look sharp at screen size while having too few pixels, or too little real detail, for a big, close-up print.
Does this modify my photo?
No, this only reads and reports on the photo; nothing about the file itself is changed.
Is my photo uploaded anywhere?
No. Everything happens entirely in your browser.

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