SheetFix

A small Google Sheets add-on. Select cells, pick an operation from the SheetFix menu, done.

Operations

UPPERCASE	john smith → JOHN SMITH
lowercase	JOHN SMITH → john smith
Title Case	john smith → John Smith
Sentence case	HELLO WORLD. THIS IS JOHN. → Hello world. This is john.
Invert Case	John SMITH → jOHN smith
Trim & Fix Spaces	" John Smith " → "John Smith"
Remove Line Breaks	John ⏎ Smith ⏎ London → John Smith London

Data safety

Only the currently selected range is touched.
Formula cells and generated spill-output cells are protected.
Blank cells, numbers, dates and booleans are skipped.
No rows, columns or formatting are changed.
Processing uses Google Apps Script and Google's own Sheets API; no external SheetFix server is used.

Install

The add-on source lives in apps-script/ in this repository: Code.gs, Transforms.gs and appsscript.json. Follow apps-script/README.md to paste them into Extensions → Apps Script and reload your sheet.