Actual Size Print Preview
See what physical size an image will print at for a given DPI, directly on your screen, after a quick calibration on a ruler. The result remains approximate: it depends on your screen's actual pixel density.
1. Calibrate your screen
Place a physical ruler against your screen and adjust the slider below until the blue bar measures exactly 10 cm.
Current bar width: 378 px for 10 cm.
2. Preview your image
How It Works
A browser doesn't know your screen's actual physical pixel density (the number of pixels per centimeter varies hugely between a small smartphone and a large monitor). To work around this limitation, this tool asks you to calibrate a reference bar against a physical ruler: once this scale is known (pixels per centimeter), the image is displayed at the physical size calculated from its pixel dimensions and the target DPI you specified.
Why is the result still approximate?
Accuracy depends on how precise your manual ruler calibration is, the browser zoom level (which must stay at 100%), and the exact display resolution of your screen. It's enough to get a reliable idea of a print's footprint, but it doesn't replace a physical check before a critical print job.
What does the DPI shown here represent?
The target DPI corresponds to the intended print resolution (300 DPI for a standard photo print, for example). It is only used to convert the image's pixels into physical centimeters (size = pixels ÷ DPI), independently of your screen calibration.
100% local processing: the image stays in your browser and the preview is calculated entirely client-side, with no server upload.