Spreadsheet cleaner
Clean CSV & Excel Files Online
Clean CSV files online without uploading sensitive spreadsheet data. SheetSweep removes duplicate rows and empty rows, trims stray spaces, and cleans confusing headers so your file is easier to use.
The spreadsheet cleaner also standardizes common data such as dates, email addresses, phone numbers, names, and status labels. Formula-like cells and other uncertain values are flagged for review instead of being silently guessed.
Use it for CSV, TSV, XLSX, or XLS files, then download a cleaned copy and a change log. Your original file stays untouched.
Open the CleanerPrivate by design. Your files never leave this browser tab — no uploads, no servers, no signup. What happens in your spreadsheet stays in your spreadsheet.
1Choose your spreadsheetAdd a CSV, TSV, XLSX, or XLS file from your device.
2Review the cleanupSee duplicates, empty rows, standardized cells, and anything that needs your decision.
3Download the clean fileSave the cleaned spreadsheet and its change log without changing the original.