Clean a file
Everything happens in this browser tab: your file is read, analyzed and cleaned on your own device.
Step 1 · Upload
Upload your file
Drop a CSV or Excel file here, or choose one. Your file is read and cleaned inside this browser tab. It is never uploaded to a server.
No file to hand? Try a sample CSV without uploading your own file — it runs through exactly the same steps.
- Accepted
- .csv · .tsv · .txt · .xlsx
- Separators
- comma, semicolon, tab, pipe
- Maximum size
- 15 MB
- Maximum rows
- 100,000
Privacy: FlowCSV processes files in your browser, so nothing is transmitted or stored on a server. Closing this tab discards the file. The History page keeps only summary information (file name, row counts, rules used) in this browser, and Settings can clear it.