PPI Calculator
PPI (pixels per inch) describes how densely pixels are packed. For screens it decides how sharp text looks; for prints it decides whether a photo looks crisp or soft.
- Never uploaded
- Instant, no sign-up
- Works offline
About this tool
Enter a screen's resolution and diagonal, or an image's width and the print size you want, and see the density with a plain-language verdict.
How it works
- 1
Enter the screen resolution and diagonal (or tap a device).
- 2
Or enter an image width and print width.
- 3
Read the PPI and what it means.
Features
- ScreensMonitors, laptops, phones and TVs, with presets for popular models.
- PrintsSee the PPI you'll get at a given print width, and the largest sharp print size.
- Dot pitchThe physical size of each pixel in millimeters.
- Private by designEverything runs on your device. No uploads, no account, no watermark, and EXIF/GPS data is stripped from the result.
Supported formats
No file needed — enter numbers. Results update as you type.
Frequently asked questions
What's the difference between PPI and DPI?
PPI counts pixels in a digital image or screen; DPI counts ink dots a printer lays down. People often use them interchangeably for print resolution.
What PPI do I need for printing?
300 PPI for photos viewed up close, 150 PPI for posters viewed from a distance.
How is screen PPI calculated?
The diagonal in pixels (√(width² + height²)) divided by the diagonal in inches.
Are my images uploaded to a server?
No. Files are decoded, processed and re-encoded by your browser using the canvas API and Web Workers. Nothing is sent to any server, and there is no account or storage. Closing the tab discards everything.
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