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Image DPI Checker
Read the stored print density of a JPEG or PNG and see the physical print size.
Check image DPI
Source: choose an image to begin
Density: —
Pixels: —
Print size: —
Pixels per metre: —
How to use the Image DPI Checker
- Choose a JPEG or PNG file from your device.
- The tool reads the JFIF density field or the PNG pHYs chunk.
- Read the DPI value, the pixel dimensions and the resulting print size.
Features
- Reads JFIF density from the JPEG APP0 header
- Reads pixels per metre from the PNG pHYs chunk
- Converts dots per inch and pixels per metre both ways
- Shows the physical print size in inches and centimetres
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Frequently Asked Questions
Common questions about the free online image dpi checker.
Choose a JPEG or PNG and the tool reads its stored density field, showing the value in dots
per inch and pixels per metre.
DPI describes printer dots while PPI describes image pixels per inch. For file metadata they
usually mean the same thing.
No. Density only tells a printer how large to draw the image, so the pixel count stays
exactly the same.
Some editors write no density field at all, in which case most programs assume a default of
72 dpi.
At 300 dpi that is about 10 inches wide, and at 150 dpi it is about 20 inches wide with
softer detail.
Around 300 dpi is standard for photo prints, while 150 dpi is usually enough for a large
poster viewed from a distance.
No. The header bytes are read in your browser and nothing is transmitted.
Not currently. Use the JPEG or PNG original if you need to know the stored print resolution.
Yes. The checker is fully responsive and works in the browser on phones, tablets and
desktops.
Last updated: October 10, 2026