I have been used Ctrl+Shift+F to correct indentation but I heard there is another shortcut to do that: Ctrl+I
According a reference found in google, Ctrl+Shift+F is Reformat and Ctrl+I is Correct indentation.
Is there any difference between them? or between Reformat and Correct indentation?
If you press CTRL + I it will just format tabs/whitespaces in code and pressing CTRL + SHIFT + F format all code that is format tabs/whitespaces and also divide code lines in a way that it is visible without horizontal scroll.
Ctrl+Shift+F formats the selected line(s) or the whole source code if you haven't selected any line(s) as per the formatter specified in your Eclipse, while Ctrl+I gives proper indent to the selected line(s) or the current line if you haven't selected any line(s).
Reformat affects the whole source code and may rebreak your lines, while Correct Indentation only affects the whitespace at the beginning of the lines.
Ctrl+Shift+F formats the selected line(s) or the whole source code if you haven't selected any line(s) as per the format specified in your Eclipse, while Ctrl+I gives proper indent to the selected line(s) or the current line if you haven't selected any line(s). try this. or more precisely
The Ant editor that ships with Eclipse can be used to reformat
XML/XHTML/HTML code (with a few configuration options in Window > Preferences > Ant > Editor).
You can right-click a file then
Open With... > Other... > Internal Editors > Ant Editor
Or add a file association between .html (or .xhtml) and that editor with
Window > Preferences > General > Editors > File Associations
Once open in the editor, hit ESC then CTRL-F to reformat.
来源：https://stackoverflow.com/questions/6068009/difference-between-ctrlshiftf-and-ctrli-in-eclipse