Image Histogram
See a picture’s RGB and brightness histogram, and whether shadows or highlights are clipped. Free, and it runs on your device.
Image Histogram shows how a picture’s tones are spread from black to white, for brightness and for the red, green and blue channels. A glance tells you whether a photo is under- or overexposed, and the tool says how much of it is pure black or pure white, where detail is lost. A table gives each channel’s average, median, spread and range, and you can download the chart or the counts as CSV.
How to use Image Histogram
- 1
Add your picture
Drop or choose a photo or image.
- 2
Read the chart
Switch between RGB, brightness and each color.
- 3
Download
Save the chart as PNG or the numbers as CSV.
What it does
- Exposure at a glance
- Tones from shadows on the left to highlights on the right.
- Clipping check
- How much is pure black or pure white.
- Per channel
- Average, median, spread and range for each color.
Questions
How do I read a histogram?
Left is dark, right is bright, height is how many pixels have that tone. A pile-up at either end means lost detail.
What is clipping?
Pixels at pure black or pure white. Small amounts are normal; large areas mean shadows or highlights have no detail left.
Are transparent pixels counted?
No. Fully transparent pixels are left out.
Is my picture uploaded?
No. It’s processed on your device and never leaves it.