Convert tabs to spaces in Notepad++
How do I convert tabs to spaces in Notepad++?
I found a webpage that suggests it's possible, but I couldn't find any information about how to do it.
I would like to be able to do that, because some web forms don't respect code with tabs in them.
To convert existing tabs to spaces, press Edit->Blank Operations->TAB to Space .
If in the future you want to enter spaces instead of tab when you press tab key:
Settings->Preferences...->Language (since version 7.1) or Settings->Preferences...->Tab Settings (previous versions) Replace by space Tab size field. 
Obsolete: This answer is correct only for an older version of Notepad++. Converting between tabs/spaces is now built into Notepad++ and the TextFX plugin is no longer available in the Plugin Manager dialog.
Preferences -> Language Menu/Tab Settings . TextFX -> TextFX Edit -> Leading spaces to tabs or tabs to spaces . Note: Make sure TextFX Characters plugin is installed ( Plugins -> Plugin manager -> Show plugin manager , Installed tab). Otherwise, there will be no TextFX menu.
Settings -> Preference -> Edit Components (tab) -> Tab Setting (group) -> Replace by space
In version 5.6.8 (and above):
Settings -> Preferences... -> Language Menu/Tab Settings -> Tab Settings (group) -> Replace by space
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