1. Load your spreadsheet
Drop an .xlsx, .xls or .csv export. The first non-empty row becomes your header row, so exports with a blank title row still parse correctly.
Remove duplicate rows from CSV & Excel privately
Dedupe by all columns, email or name — with conflict resolution. Duplicate removal is pre-enabled below — 100% client-side, zero uploads.
.xlsx / .xls / .csvNo sign-upInstant export
Ready for your spreadsheetLocal workspace
Drag & drop your spreadsheet here
or click to browse · .xlsx, .xls, .csv · processed in your browser
Cleaning rules
Pick what to fix, then process. Nothing leaves your device.
Blank fields in the kept record are filled from its duplicate.
Adds First Name and Last Name columns. Handles "Doe, Jane" too.
How to Clean and Restructure Excel Files Online
Exported spreadsheets rarely arrive import-ready. Padded cells, repeated rows, three different date formats in one column and a single "Full Name" field break lookups, pivot tables and CRM imports. Follow the steps below to fix the most common CSV and Excel errors in one pass.
2. Fix invisible whitespace
Trailing spaces are the #1 cause of failed VLOOKUPs and broken CRM imports. Auto-trim collapses double spaces and strips padding from every cell and header.
3. Remove duplicates and blank rows
Exports often repeat rows across paginated reports and leave fully empty rows behind. Deduping keeps the first occurrence of each identical row.
4. Normalize mixed date formats
03/07/2024, 7-Mar-24, March 7 2024 and raw Excel serial numbers all become YYYY-MM-DD — the only format databases and pivot tables sort reliably.
5. Restructure names and casing
Split a full name column into First Name and Last Name (including "Doe, Jane"), then apply consistent UPPERCASE, lowercase or Title Case text.
6. Export and re-import
Download the cleaned result as .xlsx or .csv and feed it straight into Excel, Google Sheets, a CRM or a database import job.