Image Histogram Viewer
A histogram shows how many pixels sit at each brightness from black (left) to white (right). It's the quickest way to see whether a photo is underexposed, overexposed or has lost detail in the shadows or highlights.
- Never uploaded
- Instant, no sign-up
- Works offline
About this tool
Switch between combined RGB channels and luminance, and read the exposure summary underneath.
How it works
- 1
Add an image (or try the sample).
- 2
The report appears instantly.
- 3
Copy the values you need — nothing is uploaded or changed.
Features
- RGB and luminanceSee each color channel or overall brightness.
- Clipping reportPercentage of pure black and pure white pixels.
- Exposure verdictDark, balanced or bright, at a glance.
- Private by designEverything runs on your device. No uploads, no account, no watermark, and EXIF/GPS data is stripped from the result.
Supported formats
Input: JPG, PNG, WebP, GIF, BMP, SVG, AVIF, plus TIFF/HEIC where your browser can decode them. Nothing is changed or downloaded — it's a read-only check.
Frequently asked questions
What does a good histogram look like?
There's no single ideal, but data spread across the range without big spikes at the far edges usually means good exposure.
What is clipping?
Pixels pushed to pure black or white, where detail is lost and can't be recovered.
How do I fix a dark photo?
Open it in the photo editor and raise exposure or shadows.
Are my images uploaded to a server?
No. Files are decoded, processed and re-encoded by your browser using the canvas API and Web Workers. Nothing is sent to any server, and there is no account or storage. Closing the tab discards everything.
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