Image Resolution Checker

How to check image resolution

1. Add one or more images with Select files or drag and drop.
2. Read the results: width and height in pixels, megapixels, aspect ratio and stored DPI.
3. Look at the print sizes calculated for common DPI values.
4. If the image is too large or too small, continue with Resize Image.

Pixels versus DPI

An image's resolution is its pixel count, for example 3000 × 2000. On screens, that is all that matters. DPI (dots per inch) is just a number stored in the file that tells printing software how large to print it. The same 3000 × 2000 photo prints at 10 × 6.7 inches at 300 DPI or 20 × 13.3 inches at 150 DPI; the pixels never change.

What the checker reports

For each image you get the pixel dimensions, megapixels, simplified aspect ratio, file format, the DPI value stored in the file if there is one, and the physical print size at common resolutions. Screenshots and images exported for the web often carry 72 or 96 DPI, or no DPI at all. That doesn't make them low quality; it only affects default print size.

Is the resolution enough?

For prints viewed up close, such as photos and brochures, aim for about 300 pixels per inch at the final size. Posters seen from a distance look fine at 150. On the web, full-width images rarely need to be wider than 1920–2560 pixels. Use the Image Dimension Calculator to work out the exact pixels for a print size.

Frequently asked questions