Does it touch line breaks?

Line breaks are kept unless the line is blank and Remove blank lines is on.

Yes, runs of spaces and tabs become a single space.

Whitespace Cleaner

Trim lines, collapse spaces and remove blank lines.

Trim linesCollapse spacesRemove blank lines

Hello world
Extra spaces
End

Clean messy text: trim each line, collapse repeated spaces and drop empty lines.

Does it touch line breaks?: Line breaks are kept unless the line is blank and Remove blank lines is on.
Are tabs collapsed?: Yes, runs of spaces and tabs become a single space.