File ToolsFree

CSV Cleaner

Clean and fix messy CSV files in your browser. Remove duplicate rows, trim leading/trailing whitespace from cells, remove empty rows, standardize delimiters, and fix BOM encoding issues. Preview all changes before downloading the cleaned file. No signup.

Frequently Asked Questions

What cleaning operations are available?▼
Remove duplicate rows (keeping first occurrence), trim whitespace from all cells, remove completely empty rows, standardize the delimiter (e.g., convert semicolons to commas), and remove BOM (Byte Order Mark) characters that cause encoding issues.
Can I preview changes before downloading?▼
Yes. The tool shows a before/after comparison so you can verify what will change before saving the cleaned file.
Is the original file modified?▼
No. Your original CSV file is unchanged. The tool generates a new cleaned copy that you download.
How are duplicate rows detected?▼
Two rows are considered duplicates if all their cell values are identical. Comparison is case-sensitive by default.
Is the cleaning done in the browser?▼
Yes. All operations run locally in your browser using JavaScript. Your CSV data is never uploaded to any server.