A Histogram is a graph of the number of times a byte of each value from 0 to 255 occurs in a file. Click the 'Tools > Histogram' menu option to calculate and display the histogram for the current file.

If no selection is made on the file, the Histogram will be run on the entire file. If a selection is made, the Histogram dialog box will be shown. In the dialog, select the Selection toggle to calculate the histogram based only on the selected bytes (the default), or select Entire File to calculate the histogram on all bytes in the file.

Output Window

The result of the histogram will be shown in the Output Window. On the right side of the window is a table of all byte values from 0 to 255. The Dec, Hex, and Char fields indicate the value of the byte in different formats. The Count field indicates the number of occurrences of the byte value in the file and the Percent field indicates the percentage of the file the byte value occurs. The table can be sorted by clicking on one of the field headings.

A graph is displayed in the left area with percentage running along the vertical axis and byte value running along the horizontal axis. A blue bar indicates the percentage of each value. Selecting a value in the output table will highlight the corresponding bar as yellow in the graph. The total number of bytes in the histogram will be shown below the graph. To clear the histogram, right click on the Output Window and select 'Clear'. Press the Esc key in the Output Window to hide the window.