Dots per inch, a print-resolution measure.

Does the tool increase resolution?

No, it only calculates effective DPI.

Why does DPI change with print size?

The same pixels spread across more inches reduce DPI.

Is 300 DPI always required?

Requirements depend on print size and viewing distance.

Can it inspect vector images?

It is designed for raster image dimensions.

Image DPI Checker

Read the DPI stored in a JPG or PNG image.

Reading time:: 2 min
Last updated:: 5 August 2026
Price:: Free, no signup

Your file

Click to choose a fileAccepts: image/jpeg,image/png · Processed locally in your browser

Results (live)

Choose a file to see the result.

What the Image DPI Checker does

Inspect image dimensions and calculate an approximate DPI for a chosen print size.

Check an image's pixel dimensions and see the print DPI it would deliver at a chosen size.

Why the Image DPI Checker is useful

Pixel dimensions alone do not show how large an image can print at a desired resolution.

Files that look sharp on screen can print blurry, and knowing the effective DPI before sending artwork to a printer saves a wasted run.

Also known as: image dpi checker, check dpi, png dpi, jpg dpi, free image dpi checker, online image dpi checker, image dpi checker online free.

How to use the Image DPI Checker

1
Set the print size
Choose the image and enter the physical print size you have in mind.
2
Adjust and process
Select an image, enter the intended print dimensions, and review the estimated horizontal and vertical DPI.
3
Read the DPI
Read the calculated DPI against the printer's requirement, then decide whether a larger file is needed.

Key features

Reads pixel dimensions locally
Calculates DPI from target print size
Displays aspect ratio and resolution details

Benefits

The reading turns a vague will-it-print question into a yes or no.
The math is instant and local, so several print sizes can be tried in a row.

Real-life use cases

Print checks

Confirm a client's logo reaches 300 DPI at the badge size the printer quoted.

Flyer planning

Decide whether a downloaded photo is fit for an A4 flyer.

Tips for the best results

DPI is a print-size calculation; changing the number alone does not create additional image detail.
Upscaling adds pixels, not detail; a low DPI reading means you need a bigger source.

Conclusion

Judge the DPI reading at the final print size, because the number is meaningless without a physical size attached.

Frequently asked questions

What does DPI mean?: Dots per inch, a print-resolution measure.
Does the tool increase resolution?: No, it only calculates effective DPI.
Why does DPI change with print size?: The same pixels spread across more inches reduce DPI.
Is 300 DPI always required?: Requirements depend on print size and viewing distance.
Are image files uploaded?: No, calculations run locally.
Can it inspect vector images?: It is designed for raster image dimensions.

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