FREE TOOL · 100% CLIENT-SIDE · NO UPLOAD
Drop a CRM export and see the duplicate risk before you merge anything: exact duplicates, case variants, email-alias variants, empty keys, and formula-injection traps. The file never leaves your device — this page has no upload, no analytics on your data, no server.
name,email,phone,company Jon Smith,[email protected],+1 415 555 0138,Acme Jane Doe,[email protected],+1 415 555 0139,Acme Jon Smith,[email protected],+1 415 555 0138,Acme =2+5+cmd|' /C calc'!A0,[email protected],,Acme Co Sara Lopez,[email protected],+1 628 555 0142,Bluebird Sara Lopez,[email protected],,Bluebird
PRIVACY: parsing happens in your browser with plain
JavaScript. No fetch, no beacon, no storage. Close the tab and it's gone.
LIMITS: this checker shows RISK, not truth. It never merges anything — that's the point.
Logged, reversible dedupe with flagged exceptions — $300–800 per ≤10k batch.