SheetSanitizer

SheetSanitizer helps you safely clean messy CSV and Excel files without guessing. It detects inconsistent date formats, duplicate records, invalid emails, invisible Unicode characters, leading/trailing whitespace, non-breaking spaces, casing issues, and many other spreadsheet problems. Unlike traditional spreadsheet cleaners, every issue is classified as either Safe Fix (deterministic, safe to apply automatically) or Review (requires human judgement and is never changed automatically). Everything runs locally in your browser. Your spreadsheets never leave your device.