CSV Cleaner
Upload a messy CSV, inspect it with type-aware columns, and export a cleaned copy.
Free & unlimited
All processing happens in your browser. No data is sent to any server.
About this tool
- 1
Upload CSV
Upload a CSV file or paste its content into the editor.
- 2
Review issues
The tool auto-detects problems: duplicates, empty cells, whitespace, inconsistent casing.
- 3
Fix issues
Click "Fix" next to each issue, or "Fix All" to clean everything at once.
- 4
Download
Download the cleaned CSV with a summary of changes.
- Preview the before/after comparison to verify changes look correct.
- Column operations let you rename, reorder, or delete columns.
- Stats show exactly how many rows were changed or removed.
- Auto-detect duplicates, whitespace, empty cells, inconsistent casing
- Fix individual or all issues
- Before/after preview
- Column operations
- Download cleaned CSV
- Cleaning up messy CSV exports from databases or spreadsheets
- Deduplicating rows in a data file
- Standardizing casing and formatting in CSV data