Check the DPI of an image

FreeNo uploadNo signupWorks offline

See what resolution your image actually declares before a form rejects it. The tool reads the file on your device and reports the recorded DPI, the pixel size, and the physical size those two produce together. Nothing is changed and nothing is uploaded.

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How to use Check Image DPI

Check Image DPI – See the resolution a photo declares, and the size it will print. Free, no upload.

Choose or drop your image.
Read the resolution, pixel size and printed size.
Use Change Image DPI if you need to set a different value.

Supported formats

Input: JPG, PNG
Output: Nothing - this tool only reads

What DPI actually is

An image file is a grid of pixels and nothing else. It has no physical size until something decides how many of those pixels go into each inch of paper - and that number is the DPI. It is a single value recorded in the file’s metadata: the JFIF density field in a JPG, the pHYs chunk in a PNG. Changing it changes how large the image prints, not how much detail it holds. A 600 × 600 photo tagged 300 DPI prints at two inches square; tag the same file 72 DPI and it prints at just over eight inches, from exactly the same pixels, and looks coarse.

If it says no resolution is recorded

That is normal and not a fault. Most cameras and phones never write the field, and readers assume 72 DPI when it is missing. If a form demands 300, set it explicitly - the pixels do not need to change for the file to start declaring the right number.

Limitations

JPG and PNG only.
Reports what the file declares, which is not always what the photo is capable of.

Privacy

Files you choose are read into your browser’s memory and processed on your device; they are not uploaded to a server. Temporary download links are released after use, and the offline cache never stores your documents. More about privacy and limits.

Frequently asked questions

How do I check the DPI of an image?

Drop it here. The tool reads the JFIF density field in a JPG or the pHYs chunk in a PNG and reports what it finds, along with the pixel size.

It says 72 DPI - is my photo bad?

Not necessarily. 72 is what readers assume when a file records nothing at all. Look at the pixel size: that is what determines how much detail you have.

Is my image uploaded?

No. The file is read in your browser and the few metadata bytes are rewritten on your device. Nothing is sent anywhere.

Is it free?

Yes - free, no signup, no watermark.