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Convert pixels to inches or centimetres
Pixels have no physical size on their own - a pixel is not a length. What turns a pixel count into inches is a resolution: at 300 PPI, 300 pixels is one inch; at 150 PPI, the same 300 pixels is two. So every conversion here takes a resolution, and the answer changes with it. That is not a quirk of this tool; it is what the units mean, and a converter that gives you inches without asking for a resolution has picked one for you without saying which.
How to convert pixels to inches or centimetres
- Drop in an image, or just use the calculator with the numbers you have.
- Set the resolution you are printing at - 300 PPI is the usual default.
- Read pixels against inches, centimetres or millimetres in both directions.
Supported formats
This tool accepts JPG, PNG, WebP, GIF, BMP and AVIF files. Everything is decoded by your own browser, so the formats available depend on what your browser can open - which for HEIC in particular varies between Safari and other browsers.
Frequently asked questions
How many pixels is one inch?
It depends entirely on the resolution, and that is the whole answer. At 300 PPI an inch is 300 pixels; at 72 PPI it is 72; at 600 PPI it is 600. A pixel is not a unit of length, so there is no fixed conversion - which is why any converter that answers this without asking about resolution has silently assumed one, usually 96 or 72.
Why 96 DPI for screens?
It is a convention rather than a measurement. CSS defines one inch as 96 pixels so that layouts have a stable reference, but no modern display is actually 96 physical pixels per inch - phones are often above 400. For print, use the resolution your printer or lab asks for; for the web, physical size is not a meaningful concept in the first place.
What is the difference between DPI and PPI?
PPI is pixels per inch in an image; DPI is dots per inch that a printer puts on paper, and a printer usually lays down several dots to make one pixel's worth of colour. In everyday use the two get used interchangeably and no harm comes of it, but it is why an inkjet advertising 4800 DPI is not asking you for a 4800 PPI image.
Is my image uploaded?
No. This is arithmetic, and it happens in this tab. If you drop an image in, its dimensions are read by your browser on your device and nothing about it is sent anywhere.
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