CRM CSV Cleaner
Clean, review and deduplicate CRM contact exports directly in your browser.
Your file stays on your device.
Drop your CSV here
orCSV · Max 10 MB
Choose a CSV to analyze its structure.
Review data health, apply safe fixes and choose which duplicate rows to keep.
Your file stays on your device. Analysis runs in browser memory. No data is uploaded or stored by this app.
How it works
Analyze locally, apply safe fixes, review duplicates and download a cleaned copy.
- 01
Add your CSV.
- 02
Analyze data health and review safe fixes.
- 03
Review duplicates and download your cleaned CSV.
What does CRM CSV Cleaner do?
CRM CSV Cleaner detects duplicate groups, flags invalid email addresses and missing contact information, and helps you review formatting issues. Processing runs locally in your browser. Review suggested fixes and explicitly choose which duplicate records to keep before exporting.
Common use cases
- Clean CRM exports before import
- Review lead lists
- Check contact databases
- Prepare CSVs for another CRM
Need to compare two exports after cleaning your data? CSV Compare →
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A few useful answers
Does Toolgrain upload my CSV?
For the CRM CSV Cleaner, file processing happens locally in the browser and CSV contents are not intentionally uploaded to Toolgrain.
Does the tool remove duplicates automatically?
No. Duplicate groups are presented for review. Rows are excluded from the cleaned export only after you explicitly choose which record to keep.
What CSV files are supported?
One UTF-8 CSV file up to 10 MB with a header row. Comma, semicolon and tab delimiters, quoted values and Windows or Unix line endings are supported.
Can Toolgrain detect invalid email addresses?
Yes. Practical syntax checks run on recognized email columns. They do not verify mailboxes, deliverability or DNS records.