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Image DPI Checker

Check the DPI of an image online in seconds. This DPI checker reads real PNG and JPEG density metadata and shows PPI plus print size at 300 and 150 DPI.

Drop a PNG or JPEG to check its DPIDPI is read from the file's real metadata bytes

What is the Image DPI Checker?

The Image DPI Checker reads the resolution metadata stored inside your file — the PNG pHYs chunk or the JPEG JFIF density fields — and reports the actual DPI (dots per inch) the image declares.

  • Parses real DPI from PNG pHYs chunks and JPEG JFIF headers
  • Shows horizontal and vertical density separately
  • Print size calculator at 300 DPI and 150 DPI
  • Results in both inches and centimeters
  • Reports pixel dimensions and megapixels
  • Private — files are read locally, never uploaded

How to use the Image DPI Checker

  1. 1

    Drop an image (JPEG or PNG work best) into the upload area.

  2. 2

    Read the detected DPI parsed from the file's metadata.

  3. 3

    Check the maximum print size at 300 DPI and 150 DPI in inches and cm.

  4. 4

    If no DPI is embedded, the tool tells you — most software then assumes 72 or 96 DPI.

About the Image DPI Checker

The Image DPI Checker reads the resolution metadata stored inside your file — the PNG pHYs chunk or the JPEG JFIF density fields — and reports the actual DPI (dots per inch) the image declares. Unlike tools that guess, it parses the raw bytes, so you see exactly what print software will read.

It also calculates real-world print sizes: how large the image prints at 300 DPI (professional print quality) and 150 DPI (acceptable for posters viewed at distance), in both inches and centimeters. That makes it easy to know whether a photo is big enough for a flyer, canvas or magazine page.

Everything runs locally in your browser. The image is never uploaded, so checking client artwork, print proofs and personal photos is completely private.

Frequently asked questions

How do I check the DPI of an image online?

Drop the image into this DPI checker and it reads the DPI straight from the file's embedded metadata — the pHYs chunk in PNG or the JFIF density in JPEG. You instantly see the declared DPI and the print size it supports, with nothing uploaded to a server.

How do I check the DPI of a PDF?

A PDF can hold several images at different resolutions, so there is no single page DPI. This checker reads image files directly, so to find the DPI of a picture inside a PDF, export or extract that image as a PNG or JPEG first, then drop it here to see its real density.

What DPI do I need for printing?

300 DPI is the standard for sharp photographic prints, magazines and flyers. 150 DPI is fine for large posters and banners viewed from a distance. For a 6×4 inch photo at 300 DPI you need at least 1800×1200 pixels.

Why does my image show no DPI or 72 DPI?

Many images, especially screenshots and web graphics, simply carry no density metadata, so software falls back to a default of 72 or 96 DPI. It doesn't mean the image is low quality — pixel dimensions determine quality; DPI only maps pixels to physical size.

What's the difference between DPI and PPI?

PPI (pixels per inch) describes image resolution, while DPI (dots per inch) technically describes printer ink dots. In everyday use — and in file metadata — the terms are used interchangeably, so this PPI checker and DPI checker report the same value.

Does DPI affect image quality on screens?

No. Screens display pixels one-to-one regardless of the DPI value, so a 1000-pixel-wide image looks identical at 72 or 300 DPI online. DPI matters only when printing, where it sets the physical output size.

Guides for Image DPI Checker

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