Check Image DPI Online Free – PPI & Resolution Checker

How to check image DPI online

Open the Image DPI Checker
Upload your JPEG, PNG, TIFF, or other image file
The tool reads embedded resolution data from the file's binary headers
Your DPI, pixel dimensions, print size and quality rating appear instantly
Use the custom DPI field to simulate a different print resolution

Why the DPI value matters

DPI determines how large your image will print at a given quality. An image that is 3000×2000 pixels printed at 300 DPI produces a 10″×6.67″ print. The same image at 72 DPI would produce a 41.7″×27.8″ print — but at very low quality. Checking DPI before printing prevents blurry, pixelated results.

📏 Check Image DPI →

Frequently Asked Questions

How can I check the DPI of an image on Mac?

On Mac, you can check DPI using Preview (File → Get Info → More Info) or this free online tool. Open the Image DPI Checker, upload your file, and the DPI is shown instantly — no software installation needed.

How can I check image DPI without Photoshop?

Use this free online DPI checker. It reads the DPI tag directly from the image binary (JFIF APP0 for JPEG, pHYs chunk for PNG) without requiring Photoshop, Lightroom, or any other software. Results are instant and 100% private.

What DPI do I need for a 4×6 print?

For a high-quality 4×6 inch print at 300 DPI, you need at least 1200×1800 pixels. The DPI Checker's print size table shows this requirement automatically and rates your image as "Good" or "Excellent" or "Too small" for each standard paper size.