ffee
All tools
Image Histogram
Plot the red, green, blue and luminance histograms of an image with toggles and statistics.
Read the histogram of an image
Mean: —
Median: —
Standard deviation: —
Clipping: —
Status: Load an image to begin
How to use the Image Histogram
- Choose the photo whose histogram you want to read.
- Switch the red, green, blue and luminance channels on or off.
- Read the mean, median, spread and clipping counts under the chart.
Features
- Red, green, blue and luminance histograms
- Per channel toggles and three scale modes
- Mean, median and standard deviation for each channel
- Shadow and highlight clipping counts
Advertisement
Frequently Asked Questions
Common questions about the free online image histogram.
It counts how many pixels sit at each brightness level between black and white, so you can
see the tonal range of a photo at a glance.
The left edge is pure black and the right edge is pure white. A tall spike at either end
usually means lost shadow or highlight detail.
The red, green and blue curves are drawn in their own colours and multiplied together, so
where they overlap the result turns grey.
It is the number of pixels that are almost pure black or almost pure white. A large number
means detail has been crushed in those areas.
The mean is the average brightness, while the median is the level that splits the pixels in
half, so the median resists outliers better.
A few very common brightness levels can dwarf everything else. The logarithmic and square
root modes compress those peaks so the shape is visible.
No. Pixels with an alpha value below eight are skipped so a transparent background does not
distort the result.
No. The photo is drawn on a canvas and only its pixel values are analysed, all inside your
own browser.
Yes, it is free with no account, no sign-up, no watermark and no limit on how many images you
inspect.
Last updated: October 10, 2026