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.
Updated June 2026
- 1Upload your CSV file
- 2Choose cleaning options
- 3Download the cleaned CSV
How to use CSV Cleaner
- 1
Upload your CSV file
Drag and drop your file into the upload area, or click to browse and select it.
- 2
Choose cleaning options
Remove empty rows, trim whitespace, deduplicate rows, or fix encoding issues.
- 3
Download the cleaned CSV
The cleaned-up file downloads automatically to your device.
Frequently asked questions
Everything you need to know about csv cleaner.
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.
Yes. The tool shows a before/after comparison so you can verify what will change before saving the cleaned file.
No. Your original CSV file is unchanged. The tool generates a new cleaned copy that you download.
Two rows are considered duplicates if all their cell values are identical. Comparison is case-sensitive by default.
Yes. All operations run locally in your browser using JavaScript. Your CSV data is never uploaded to any server.
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