What does clipping mean here?

A pixel where any channel sits at 0 or 255 — detail that is permanently lost to pure black or white.

Why offer a log scale?

Pixel counts vary by orders of magnitude across bins; log scaling makes the small midtone bins visible next to huge spikes.

No. Pixel data is read from a local canvas and counted in your browser.

No — it is analysis only. Use the Image Filters tool's brightness and contrast sliders to act on what you learn.

Image Tools100% Private · In-Browser

Read a photo's exposure like an editor — 256-bin R/G/B/Luma histograms with clipping warnings, log scale and a downloadable chart.

Drop an image to see its histogram

256 bins per channel · R / G / B / Luma / RGB · exposure & clipping read-out

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256-bin histograms for the red, green and blue channels, perceptual luma (Rec. 709) or an overlaid RGB view.
A log scale toggle tames tall spikes so small bins stay visible.
An exposure verdict — Under-exposed, Well exposed or Over-exposed — derived from average luma.
Clipping percentage flags pixels at pure black or white in any channel, with a warning above 2%.
The chart exports as a crisp 2× PNG for reports and tutorials.

Load A Picture
PNG, JPG or WEBP; analysis starts at once.
Switch Channel Views
Inspect R, G, B, luma or the combined RGB overlay.
Check The Read-Out
Check the exposure verdict, brightness tier, peak value and clipping percentage.
Download The Chart
Save the histogram itself as a PNG if you need it elsewhere.

Spikes pinned to the far left or right edge mean crushed shadows or blown highlights.
Luma uses Rec. 709 weights, matching how human eyes perceive channel brightness.
Very large images are sampled (analysis is capped on the long edge), so the shape is representative rather than per-pixel exact.

Image, PDF, text, calculator and media utilities — all free, all private, all running right in your browser.