RAW Histogram Viewer

It draws a brightness histogram of your image. For every pixel, the tool averages the red, green and blue values into one brightness level from 0 to 255, then plots how many pixels fall at each of the 256 levels. Shadows sit on the left, highlights on the right, and the bars are scaled so the most common level reaches the top.

Click the area labeled Upload Image and choose a photo. The histogram appears straight away under the heading Color Intensity Distribution. There are no settings to adjust. To check another image, click the area again and select a new file, and the chart redraws for that photo, which makes it quick to compare exposures from the same shoot one after another.

Yes, with one caveat. Along with JPG, PNG and WebP, the picker accepts common RAW formats such as CR2, CR3, NEF, ARW, RAF, ORF, RW2, DNG and X3F. Browsers cannot decode raw sensor data, so for a RAW file the tool finds the largest JPEG preview the camera embedded in it and plots that, and a note under the chart says so. The preview carries the camera's picture style, so the RAW file usually holds more highlight and shadow detail than the chart suggests.

A tall spike pressed against the right edge means highlights are clipped to pure white, while a pile against the left edge means shadows are crushed to black. A well-exposed image usually spreads across the range without large spikes at either edge. Low-key or high-key styles shift the shape deliberately, so read it alongside the photo rather than chasing a perfect curve.

Cameras usually build their histogram from the JPEG preview using the current picture style, and some show separate color channels. For a RAW file this tool reads that same kind of embedded preview, but it averages red, green and blue equally into one curve. A single saturated channel, such as a red dress or a blue sky, can therefore clip even when the average looks safe. Compare both, and watch strong colors carefully.

Yes. It is free, needs no software and analyzes your image in your browser, so the photo never leaves your device. To use it, you confirm once that you are a photographer and create or log into a free Imagen account. That one step unlocks this viewer and every other tool in the collection.