Clean and sanitize CSV data online for free. Fix formatting issues, remove duplicates, trim whitespace, and standardize data fields.
Use This Tool Free — No SignupData quality is the foundation of good analysis. Bad data leads to wrong conclusions, broken reports, and wasted time troubleshooting issues that start with dirty source data. Our free online CSV data cleaner helps you fix common data quality issues before they become problems. Upload your CSV and the tool identifies and fixes issues like inconsistent whitespace, duplicate records, empty rows and columns, mixed data formats, and special characters that cause import errors. The cleaner works on your data in the browser — no uploads to external servers for simple operations, which means your sensitive business data stays private. For data analysts, marketers running campaign reports, researchers compiling datasets, and anyone who imports data from external sources, this tool is an essential step between receiving raw data and starting analysis.
Load your CSV file into the tool. A preview shows your data with any issues highlighted.
Select which data quality fixes to apply — trimming, deduplication, empty row removal, etc.
Download your sanitized CSV file with all selected fixes applied.
No hidden fees, no premium tier required. All features are completely free.
Start using tools instantly. No account, no email, no credit card.
All files are transferred over HTTPS encryption. Your data stays private.
Uploaded files are automatically deleted from our servers after processing.
Browser-based tool works on Windows, Mac, Linux, iPhone, Android — any device.
Most conversions complete in under 30 seconds, even for large files.
Yes. Data is processed in your browser. Sensitive information never leaves your device for basic operations.
The tool can identify and help standardize common date format variations within your data.
The tool works with CSV files. Export your Excel data to CSV first, then clean it with our tool.