Remove empty spaces, lines, pages in MS Word

Identify special characters: In Word doc, press Ctrl+* => Paragraph marks and other hidden formatting symbols will be showed.

• ^w : white space
• ^l : manual line break
• ^p : paragraph mark
• ^t : tab character
• ^m : manual page break

Press Ctrl+H => Do these Replace until not found:

1. Multiple tabs => one tab: Find what: ^t^t. Replace with: ^t. If you want to convert tabs to white spaces, just Find what: ^t. Replace with (space)
2. Multiple white spaces => one white space: Find what: (space)(space). Replace with: (space)
3. Manual line breaks => Paragraph marks: Find what: ^l. Replace with: ^p 
4. Manual page breaks => Paragraph marks: Find what: ^m. Replace with: ^p
5. Find what: ^p(space). Replace with: ^p
6. Find what: (space)^p. Replace with: ^p
7. Multiple paragraph lines => one paragraph line: Find what: ^p^p. Replace with: ^p

If you want to do with many documents, make a macro.
Troubleshooting: Manual line breaks with Justify alignment sometimes cause not-well-formatting lines. For ex:
To correct this, do Find what: ^l then Replace with: ^p.
If you want the next line to be continued to the previous line, do Find what: ^l then Replace with: (space).