Practical tools for measured work
Image Print Size & DPI Checker
Inspect an image locally and see its print size, effective PPI and paper-size fit.
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How it works
How to use it: choose a raster image. The browser reads its pixel dimensions locally, then shows physical sizes at 150, 240 and 300 pixels per inch and estimates effective PPI on common paper sizes.
Formula. Print width in inches = pixel width / PPI, and millimetres = inches x 25.4. Paper effective PPI is the lower of the horizontal and vertical pixel densities when the whole sheet is covered.
Worked example. A 3000 x 2400 image prints at 10 x 8 inches at 300 PPI, or 20 x 16 inches at 150 PPI.
Limitations
PPI is a geometric density, not a complete quality score. Focus, compression, noise, viewing distance, printer resolution, scaling and paper all affect the result. Embedded DPI metadata does not add pixels, so this tool bases calculations on actual pixel dimensions.
Frequently asked questions
Is my image uploaded?
No. The file is decoded inside your browser. ToolHuts does not send it to a server.
Is 300 PPI always required?
No. It is a common close-view print target, while larger prints viewed farther away can look good at lower effective PPI.
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