Email list deduplicator
Remove duplicate emails before you pay to verify a list
Paste a CSV column, export, or scraped list to extract email addresses, remove exact duplicates, flag invalid syntax, and export a cleaner file for mailbox-level verification.
Paste an email list
The cleanup runs in your browser. Verifly still needs a server-side verification check for deliverability, catch-all, mailbox, and SMTP-level signals.
Cleaned is not verified
Deduplication removes obvious waste. Verifly checks whether each mailbox is deliverable, disposable, role-based, risky, or catch-all before you import or send.
Verify the cleaned listWhat deduplication really involves
Removing duplicates is more than deleting identical rows. Addresses differ by case (Jane@Acme.com vs jane@acme.com), by surrounding whitespace, and by provider-specific quirks: on Gmail, dots in the local part and everything after a + tag are ignored, so j.doe+news@gmail.com and jdoe@gmail.com reach the same inbox. This tool normalizes and compares addresses so those hidden duplicates collapse into one.
It also extracts addresses from messy input, a pasted CSV column, an export, or scraped text, and flags rows with invalid syntax, disposable domains, or role names so you see the shape of your list before you pay to verify it.
Why dedupe before you verify
Most verification services and email platforms charge per address. If a list of 50,000 rows contains 8,000 duplicates, you are paying to verify and potentially to email the same people multiple times. Deduplicating first cuts that waste directly, and it happens in your browser at no cost.
Duplicates also cause real harm downstream: the same person receiving a campaign twice looks careless, inflates your "sent" counts, and can raise complaint rates. A clean, unique list makes every later metric more trustworthy.
From a clean list to a verified one
Deduplication and syntax flagging remove the obvious waste, but they do not confirm that the remaining addresses are real, reachable mailboxes. A unique, well-formed address can still be a dead inbox or a catch-all that bounces later.
Export the deduplicated file, then run mailbox-level verification on what remains. The Verifly API at https://verifly.email/api/v1 returns disposable, role, catch-all, and SMTP flags per address, so you only pay to verify the unique addresses worth keeping. New accounts get 100 free credits to start.
Frequently asked questions
Does the deduplicator catch Gmail dot and plus aliases?
Yes. It normalizes addresses before comparing, so Gmail variations like j.doe+news@gmail.com and jdoe@gmail.com, which reach the same inbox, are recognized as duplicates rather than treated as separate contacts.
Is my list uploaded when I deduplicate?
No. Extraction, normalization, and deduplication run in your browser, so the addresses you paste stay on your machine. Mailbox verification through the Verifly API is a separate, optional step you choose to run.
What does it flag besides duplicates?
Alongside removing duplicates it flags rows with invalid syntax, known disposable domains, and role-based names like info@ or support@. That gives you a quick picture of list quality before committing to paid verification.
Why deduplicate before verifying instead of after?
Because verification and sending are usually priced per address. Removing duplicates first means you do not pay to check or email the same person twice, which on large lists can be a meaningful saving, and the dedupe step here is free.
Does removing duplicates make my addresses valid?
No. Deduplication only ensures each person appears once and flags obvious problems. A unique, correctly formatted address can still be an inactive mailbox. Confirming deliverability requires verifying each address against the mail server.
How do I verify the deduplicated list?
Export the cleaned file and run it through the Verifly API with a vf_ Bearer key, or upload it in the dashboard. GET /verify?email= returns disposable, role, catch-all, and SMTP flags so you keep only the addresses worth sending to.