CSV / Excel Data Cleaner
Clean CSV, XLS, and XLSX data in your browser. Trim cell spaces, remove duplicate rows, standardize recognizable dates, preview changes, and export a clean spreadsheet.
Choose a spreadsheet
Import a CSV or Excel file. Your workbook is processed in this browser, not uploaded.
Tip: keep a copy of the original workbook. This tool cleans cell content in a selected worksheet; it does not preserve charts, macros, formulas, styles, or workbook formatting when exporting.
Your first 100 rows will appear here.
| Choose a spreadsheet to begin. |
Clean spreadsheet data without uploading it
Import a CSV or Excel workbook, select a worksheet, and clean duplicate rows or whitespace. The preview shows the first 100 records while exports include all cleaned records. Date standardization handles common numeric day/month/year or month/day/year dates and ISO-style values; ambiguous date strings should be checked manually.
Frequently asked questions
Does this upload my spreadsheet?
No. The workbook is parsed by a browser library on this device. The page does not send the workbook contents to NeoITWorks.
Will formatting, formulas, or macros be preserved?
No. The cleaner exports the selected sheet as data only. It does not retain workbook formatting, formulas, charts, or macros. Keep your original file for records.
How are duplicate rows detected?
Every cell in a data row is compared after the selected trim and case options. The first matching row is kept. The first row is treated as the header and is never removed.
Are date values changed automatically?
Only when you enable the option. Recognizable dates are converted to YYYY-MM-DD; ambiguous or unsupported values are left unchanged for your review.