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Image Info Checker

See dimensions, format, colour depth and file details.

Image Tools Reviews Free · no sign-up

Drop an image here, or click to choose one

JPEG, PNG, WebP, GIF or SVG · processed on your device, never uploaded

Quick Tool Overview

The Image Info Checker reports the facts about a file: dimensions, simplified aspect ratio, megapixels, real format from the signature bytes rather than the extension, whether the alpha channel is actually used, and a print size table. Bytes per pixel tells you whether there is compression left on the table.

What it does
Reports an image's technical properties
You give it
Any image file
You get back
Dimensions, format, ratio and print sizes
Best for
Checking specs and diagnosing odd files
Image Tools Free, unlimited use No sign-up Runs in your browser

About the Image Info Checker

Sometimes you just need the facts about a file: how big it is in pixels, what shape that makes it, what format it actually is rather than what the extension claims, and whether it has transparency.

All of that is read from the file itself rather than from its name. The format comes from the signature bytes, so a PNG renamed to .jpg is reported correctly. Transparency is detected by actually checking the alpha channel rather than assuming it from the format. The aspect ratio is reduced to its simplest whole-number form, the megapixel count and the bytes-per-pixel ratio are calculated, and a print size table shows what the image supports at each density.

Key features of the Image Info Checker

Real format detection

Read from the file signature, so a PNG renamed to .jpg is reported as what it actually is.

Transparency actually checked

The alpha channel is examined rather than assumed from the format, so a PNG that does not use it says so.

Simplified aspect ratio

Reduced to whole numbers and matched to a named standard where one fits.

Bytes per pixel

A quick read on compression efficiency — a high figure means there are savings available.

Print size table

What the image supports at 150, 300 and 600 DPI, in both centimetres and inches.

How to use the Image Info Checker

  1. 1

    Drop in a file

    Any image your browser can decode.

  2. 2

    Read the essentials

    Dimensions, ratio, megapixels, format and file size.

  3. 3

    Check the details

    Real format from the signature bytes, transparency from the alpha channel.

  4. 4

    See the print sizes

    What the image supports at 150, 300 and 600 DPI.

Frequently asked questions

Because the extension is just part of the filename and can be anything. The format here is read from the file's signature bytes, which is what actually determines how it decodes.

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