Free Image Tool

Image DPI Checker: Check the DPI of an Image Online

Upload a JPEG or PNG to see its DPI, pixel size and print size in seconds. Find out if it’s ready for 300 DPI printing. Free, no signup.

Detect image DPI Pixel dimensions Print size in inches and cm 300 DPI print check JPEG and PNG Export as JSON No signup

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Check Image DPI in Seconds

Printers, publishers and print shops ask for 300 DPI files, but most image viewers hide that number. This DPI checker reads the resolution stored in your image and shows it next to the size it will print at.

Image DPI checker showing pixel dimensions next to the print size on paper

See Pixel Size and Print Size Together

DPI alone doesn’t tell you how big a photo will print. The tool shows the pixel dimensions and works out the print size in inches and centimetres, so you know exactly what you’re working with.

Printer producing a sharp photo print at 300 DPI

Know if Your Image Is Print-Ready at 300 DPI

Next to the detected DPI, the checker shows how large the image would print at 300 DPI, the standard for sharp prints. If that size is smaller than you need, find a larger original before you send it to print.

Checking photo DPI online on a laptop and a phone

Check Photo DPI Without Photoshop

No editing software needed. Upload a JPEG or PNG up to 5 MB and the photo DPI appears instantly. It works in your browser on Windows, Mac, Android and iPhone.

Image DPI results exported as a JSON file

Export the Results as JSON

Need the numbers in a report or a script? Export the DPI, dimensions and print sizes as JSON, ready to save or share with a designer or developer.

Image resolution in dots per inch compared with mouse DPI

Image DPI, Not Mouse DPI

This tool checks image resolution, the dots per inch used for printing. Mouse DPI measures cursor sensitivity, which is a hardware setting you check in your mouse software instead.

How to Check the DPI of an Image

Upload your image

Choose a JPEG or PNG up to 5 MB, or click Sample to try the tool first.

Click Check DPI

The checker reads the resolution stored in the file.

Read your results

See the DPI, the pixel dimensions and the print size at the detected DPI and at 300 DPI.

Export or clear

Export the results as JSON, or click Clear to check the next image.

Image DPI Checker FAQs

Everything about checking image DPI and print size.

What is DPI in an image?

DPI (dots per inch) tells a printer how many pixels to place in each inch of paper. A 3,000-pixel-wide image prints 10 inches wide at 300 DPI, or 20 inches wide at 150 DPI with less detail.

How do I find the DPI of an image on Windows?

Right-click the file, choose Properties and open the Details tab. Look for Horizontal resolution and Vertical resolution under Image.

How do I check the DPI of an image on a Mac?

Open the image in Preview, go to Tools and choose Show Inspector (Cmd+I). The Image DPI appears on the General Info tab.

How do I check DPI in Photoshop?

Go to Image, then Image Size. The Resolution field shows the DPI, which Photoshop labels as pixels per inch.

Why does my image show 72 DPI?

Many cameras, phones and web exports save 72 DPI as a default, or no DPI at all. On screens the number makes no difference; only the pixel dimensions matter. For print, check the size at 300 DPI instead.

How do I work out print size from DPI?

Divide the pixel width and height by the DPI. An image of 2,400 × 3,000 pixels at 300 DPI prints at 8 × 10 inches. Multiply inches by 2.54 for centimetres.

Can I change the DPI of an image here?

No. This tool checks DPI but doesn’t change it. To print larger at good quality, you need more pixels, not just a higher DPI number.

Is the image DPI checker free?

Yes. Check the DPI of as many images as you like, free, with no signup and no software to install.

Need a Different Size? Fix It in Seconds.

Get the right proportions with the Image Aspect Ratio Calculator, or change the dimensions with the Image Resizer.

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Raheel Jakhura

CEO / Co-Founder

Our goal is to provide online free tools so you don't have to install any software for basic usages. We are trying to add more tools and make these tools free forever.

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