Image Histogram

See exactly how tones are distributed across your photo — visualized as RGB, individual channel, or luminance bars across all 256 levels. Instant, private, and free in your browser.

Upload an image

Options

RGB and luminance modes

Switch between overlaid R/G/B bars for a combined view, individual channel charts, or luminance-weighted grayscale distribution — all computed directly from your image pixels.

100% private

Your image is analyzed entirely in your browser using the Canvas API — nothing is ever uploaded to a server.

Free and unlimited

No signup, no watermark, no daily limit. Analyze as many images as you like.

How to generate an image histogram

1

Upload your image

Drag and drop or click to select a JPG, PNG, or WebP image.

2

Choose a channel

Select RGB to see all three channels overlaid, or pick Red, Green, Blue, or Luminance for a single-channel view.

3

Read the chart

Bars to the left represent dark tones; bars to the right represent bright tones. A healthy exposure sits in the middle without clipping at either end.

4

Download

Click download to save the histogram chart as a PNG image.

Frequently asked questions

What does an image histogram show?

A histogram shows how often each brightness level (0 = black, 255 = white) appears across all pixels. A spike at the left means dark areas dominate; a spike at the right means bright areas dominate. Clipping at either end suggests detail is lost in shadows or highlights.

What is the difference between RGB and luminance mode?

RGB mode overlays three semi-transparent bars — one for each colour channel — so you can spot colour casts or channel imbalances. Luminance mode collapses all channels into a single perceived-brightness value (0.299R + 0.587G + 0.114B), which matches how the human eye weights colours.

Is the histogram tool free?

Yes — completely free and unlimited. No signup, no account, no watermark, no daily limit.

Are my files uploaded to a server?

No. The histogram is computed entirely in your browser on your device. Your image never leaves your computer, so it stays fully private.

Analyse another image

Drop in a new photo to visualize its tonal distribution — free and unlimited, no signup required.

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Choose The Right Tool

Why this page exists

Use the histogram tool to visualize the tonal distribution of any photo — see exactly how red, green, blue, and luminance values are spread across all 256 levels.

Best for

  • Diagnosing under- or over-exposed photos before editing
  • Checking color balance and channel distribution
  • Generating a downloadable histogram chart from a photo