Check an image’s size, colours and histogram

Everything about an image at a glance: its format, size in pixels and megapixels, aspect ratio, stored DPI, how large it prints, its main colours, whether it has transparency, and a histogram of its tones.

Drop an image hereAdd an image

JPG, PNG, WebP, GIF, AVIF or BMP, up to 80 MB. You can also paste an image.

Read on your device. Your image is never uploaded.

How it works

  1. Your browser decodes the image and reads its size, and the DPI stored in JPG and PNG files.
  2. It counts how many pixels have each level of red, green, blue and brightness, which makes the histogram.
  3. From the same counts it finds the average and main colours, transparency and clipped shadows or highlights.

Supported formats

Opens
JPG, PNG, WebP, AVIF, BMP and GIF (the first frame of an animation)
Saves
Nothing. It only reads the image.
Limits
Files up to 80 MB.
  • Colours and tones are measured on up to 4 megapixels, sampled evenly from the full image; sizes and DPI come from the file itself.
  • For camera settings, dates and location, use the EXIF Viewer.

Your image stays on your device

This tool runs entirely in your browser. The image is never uploaded, so there is nothing for us to store, see or delete.

To check, open your browser’s developer tools, switch to the Network tab and use the tool: you will not see your image being sent anywhere.

Questions

Are my images uploaded anywhere?

No. The image is read and processed by your own browser. Nothing is sent to our servers, so there is no copy of your image anywhere but your own device.

How do I read the histogram?

Dark tones are on the left and light tones on the right; taller means more pixels. A pile-up against either edge means shadows or highlights have lost detail (clipping).

Why does DPI say “Not set”?

Many images don’t store a DPI at all; apps then show 72 or 96. What matters for printing is the pixel size, shown as “Prints sharp up to”.