Free browser tool
Clean a CSV online
Clean a CSV with explicit, reversible choices. Identifiers such as 00123 stay as text.
Your file stays on this device. No upload, account or tracking.
Use the tool
Paste text or choose a UTF-8 file. Up to 600,000 characters, 5,000 data rows and 100 columns.
Result
The preview may be shortened on screen. The download contains the complete result.
What this tool does
Trim cell whitespace and remove exact duplicate rows without uploading your file.
Limits and safe use
Up to 600,000 characters, 5,000 data rows and 100 columns. Keep the original file and review the output before using it elsewhere. This tool does not certify an import, infer missing meaning or send data to a model.