Image Histogram

View the RGB channel and brightness histogram of your image to understand its exposure and color distribution. All analysis happens locally in your browser — your image is never uploaded.

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Drop an image or click to upload

PNG, JPG, WEBP, BMP

What Is an Image Histogram?

An image histogram charts how many pixels sit at each brightness level (0-255). The horizontal axis is brightness — dark on the left, bright on the right — and the vertical axis is the number of pixels at that brightness.

By reading the histogram you can quickly tell whether an image is properly exposed, whether its contrast is high or low, and whether the colors are shifted. It's one of the most common diagnostic tools in photography and design.

How to View an Image Histogram

Three steps to view your image histogram:

  • Click the upload area and choose a local image (PNG, JPG, WEBP, or BMP supported).
  • The histogram is generated automatically as soon as the image loads.
  • Switch between RGB channels and brightness modes to inspect different dimensions of the color distribution.

Tips

  • If the histogram leans left, the image is dark; if it leans right, the image is bright.
  • In RGB mode, the overlap of the three channels indicates color balance — a strong shift toward one channel means a color cast.
  • If the histogram is pushed against both edges with a hollow middle, the image has very high contrast.

Frequently Asked Questions

What is an image histogram?+
A histogram counts how many pixels sit at each brightness level (0-255): the horizontal axis is brightness and the vertical axis is pixel count. It gives you an instant read on your image's exposure and contrast.
How can I tell if my image is overexposed or underexposed?+
If the histogram bunches up on the right side (near 255), the image is overexposed; if it bunches up on the left (near 0), it's underexposed. A well-exposed image usually has a fairly even spread.
What's the difference between an RGB histogram and a brightness histogram?+
An RGB histogram charts the red, green, and blue channels separately, while a brightness histogram combines them by how bright they appear to the human eye — making it better for judging overall exposure.
Is my image uploaded anywhere?+
No. All analysis happens locally in your browser — your image never leaves your device.

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Image Histogram — free online image histogram, histogram, RGB histogram, brightness distribution, luminance, exposure analysis. No signup required. Works in your browser.