Check a Mailchimp Contact CSV Before Import
Email-list CSVs can contain duplicate email values, blank rows, extra spaces, strange characters, or delimiters that make the file open wrong. A local precheck can help you inspect common file-format issues before import.
Quick checklist
- Review duplicate email values
- Find blank email rows
- Look for malformed email text
- Check for semicolon or tab delimiters
- Review extra spaces around email values
- Check weird or garbled characters
Why email-list CSVs need review
Contact lists may come from forms, CRMs, spreadsheets, exported customer lists, or older systems. Before importing, review file structure and obvious row-level issues.
Argon can flag common CSV formatting issues and generate review rows. It does not send email, connect to Mailchimp, or verify addresses.
What Argon can flag locally
Argon can flag duplicate email values, blank email values, malformed-looking email text, extra spaces, semicolon delimiters, uneven rows, and weird characters.
Use the review rows export as a starting point for manual review before import.
Try the free local CSV precheck tool
Upload the contact CSV locally and inspect common formatting issues before import.
Try the free local CSV precheck toolArgon flags common file-format and structure issues for review. It does not guarantee platform import success.
Argon checks file format only. It does not confirm addresses, list permission, inbox outcomes, or regulatory readiness.