Is there a way to show the hexadecimal/ASCII for all text showing in the editor?
I use Windows XP and Notepad++ 6.3
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If you're just looking for non-standard character values, you can select View > Show Symbols > Show all characters.
Classical ASCII values below 32 will be shown with the names in the top right picture here. "HT" is the Tab character with ASCII value 09, "LF" is linefeed (newline character), and so on. But most of the rest will show a hex code for the value if it's not an actual visual symbol in the current encoding.
Here you can find a lot of plugins for Notepad++: http://sourceforge.net/projects/npp-plugins/
An hex-editor-plugin is along too: http://sourceforge.net/projects/npp-plugins/files/Hex%20Editor/
In addition to the plugins mentioned above, there's the TextFX plugin (explained here: https://stackoverflow.com/questions/12699833/textfx-menu-is-missing-in-notepad )
With it, you can select TextFX Convert > Convert text to hex-16
In fact there is a plugin that comes as an "HexEditor.dll" with 270336 byte in size. Copy it to "plugin" folder.
It works with 32-bit version of Notepad++ only. Looks like there is no 64-bit Version. Unfortunately NPP disables the plugin (moves to disabled folder) when upgrading NPP. It says there are known issues. I've never ran into those. it works fine for me. Sourcecode is available and one really should forge the code and redo some stuff. I recommend the use of free hex-editor "hxd" anyway for more than a quick view into the binary.
I've found the HEX_Editor for Notepad++ x64.