ImageToolKit

Image DPI Checker — Check Image Resolution & DPI Online [2026]

Upload any image → instantly see its DPI/PPI, dimensions, file size, color depth, and format. Tells you if it's print-ready (300 DPI) or web-optimized (72 DPI). Free and browser-based.

Drop an image here or click to browse

Supports JPEG, PNG, WebP, GIF, BMP, AVIF

What is Image DPI Checker?

Image DPI Checker is a free online tool that reads the DPI (dots per inch) or PPI (pixels per inch) metadata from image files. DPI information tells you the intended print resolution of an image — 300 DPI is standard for high-quality printing, while 72 DPI is typical for web display. The tool also shows pixel dimensions, file size, and format information.

How to Use Image DPI Checker

Upload an image by dragging it into the drop zone or clicking to browse. The tool instantly analyzes the file and displays: pixel dimensions (width x height), DPI/PPI (if embedded in metadata), file size, file format, and color information. A badge indicates whether the image is suitable for print (300+ DPI), standard web use (72-150 DPI), or unknown (no DPI metadata found).

How Image DPI Checker Works

The tool reads the uploaded image file as an ArrayBuffer and parses the binary data to extract DPI metadata. For JPEG files, it reads the JFIF header (APP0 marker) which contains X and Y density values. For PNG files, it reads the pHYs chunk which contains pixels-per-unit values. The pixel dimensions are obtained by loading the image into an HTML5 Image element. File size is calculated from the raw file data. All analysis happens in your browser.

Common Use Cases

  • Verify if an image meets 300 DPI requirements for print shops
  • Check if web images are appropriately sized at 72 DPI
  • Inspect image metadata before submitting to stock photo sites
  • Determine the actual resolution of downloaded images
  • Verify image specifications for graphic design projects

Frequently Asked Questions

What is the difference between DPI and PPI?▼

DPI (dots per inch) refers to print resolution — how many ink dots a printer places per inch. PPI (pixels per inch) refers to screen resolution — how many pixels are displayed per inch. In practice, the terms are often used interchangeably for image resolution.

What DPI do I need for printing?▼

300 DPI is the standard for high-quality printing (magazines, brochures, photo prints). 150 DPI is acceptable for large-format prints viewed from a distance. 72 DPI is standard for web and screen display only.

What if no DPI information is found?▼

Not all images have DPI metadata embedded. Screenshots, web-downloaded images, and images processed by certain software may lack DPI information. The tool will still show pixel dimensions and file size.

Can I change the DPI of an image?▼

This tool only reads DPI information — it does not modify images. To change DPI, you would need an image editor that can set the metadata. Note that changing DPI metadata alone does not change the actual number of pixels in the image.

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