CSV Cleaner & Deduplicator
Trim whitespace, remove duplicate rows and flag malformed emails before importing CSV.
Free · No sign-up · Runs in your browser
Your result
Choose your settings, then run the tool to see the result.
How to use this tool
- Trim whitespace, remove duplicate rows and flag malformed emails before importing CSV.
- Choose the input and settings below. Example values can be replaced.
- Run the tool and check the preview and any notices.
- Download the result. Your original input files stay unchanged.
Scope & privacy
Up to 20,000 data rows and 5 MB. Email checks validate syntax, not deliverability. Formula-like cells export as text. Preview shows up to 100 rows.
No. Processing happens in your browser. No files, email content or calculation inputs are sent to our server.
What should I check before using the result?
Scope & privacy
Up to 20,000 data rows and 5 MB. Email checks validate syntax, not deliverability. Formula-like cells export as text. Preview shows up to 100 rows.
Are my inputs uploaded?
No. Processing happens in your browser. No files, email content or calculation inputs are sent to our server.
Put the result to work
Continue in your connected workspace to save, manage and use the result.