How to clean an email list in CSV format
A CSV is a portable format used by many email and CRM tools. Cleaning the CSV first lets you see exactly which records are kept, removed or flagged before importing the contacts elsewhere.
Clean an email list with free credits →Export and inspect your CSV
- In your email platform or CRM, export the intended contacts as CSV.
- Ensure the sheet contains one email column; other columns such as name, company and country can remain.
- Keep a copy of the source CSV before applying any changes.
Run Clean & verify
- Open the Free Email Cleaner homepage and choose the exported CSV.
- Select Remove duplicate addresses and any additional rules that fit your data.
- Upload an optional suppression file for unsubscribed or bounced contacts.
- Click Clean & verify once. The action uses checking credits for eligible retained addresses. The result provides separate cleaned, removed and review downloads.
Avoid common import mistakes
- Keep CSV column names consistent with the destination CRM.
- Check the number of retained rows before import and examine the removed-row reasons.
- Do not assume that a valid format is proof of a deliverable inbox or consent to email.
- If starting from Excel, export to CSV first; native XLSX uploads are not supported in the current build.
Which tools can export CSV?
- Common CRMs and email tools such as HubSpot, Mailchimp, Pipedrive and Resend offer CSV export workflows.
- This cleaner works on those exported files; it is not a direct API integration.
Frequently asked questions
Can I keep all columns while removing duplicate emails?
Yes. The cleaner preserves the other columns in the retained CSV rows.
Can I clean an XLSX file directly?
No. Export XLSX to CSV using your spreadsheet application before uploading.
These tools improve list formatting and organisation. They do not guarantee delivery or replace permission to email your contacts.