CSV Cleaner
Remove duplicates, blank rows, and whitespace from your CSV files. 100% browser-based — your data never leaves your device.
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What does this tool clean?
- Duplicate rows: Removes completely identical rows, keeping only the first occurrence.
- Blank rows: Removes rows where all columns are empty.
- Extra whitespace: Trims leading/trailing spaces from each cell and normalises internal spaces.
How to use the CSV cleaner
1. Select your CSV file or paste data directly. 2. Click "Clean CSV". 3. Review the results and download the cleaned file. The tool processes files entirely in your browser - nothing is uploaded to any server.
Common CSV issues this solves
Importing data from multiple sources often creates duplicate rows. Export from CRM systems can include blank rows. Data entry with inconsistent spacing breaks lookups. This tool fixes all of these in seconds.
Frequently asked questions
Is my data private?
Yes - all processing happens in your browser. No data is sent anywhere.
What file formats are supported?
CSV (comma-separated values) and TSV (tab-separated values).
Can I undo the clean?
Always keep a backup before cleaning. The tool can identify duplicates but once you download, changes are permanent on your end.