Near-duplicate email finder: addresses that are one typo apart
In short: Upload a list or paste a column of addresses and see every pair that is one character apart, in the name or in the domain, grouped by how they differ. Limit: It reads the text only; it cannot say which address of a pair exists.
Upload a list or paste a column of addresses and the tool finds every pair that is one edit apart: one letter changed, two letters swapped, one character added or missing, or one digit changed. It looks in the part before the @ and in the domain, and you can download the pairs to decide which to keep.
Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. Check your list free nowSee pricing
Sample result
Eight example addresses hold 5 similar pairs, such as john.smith and jonh.smith.
- Similar pairs
- 5
- Addresses read
- 8
- Digit-only pairs
- 1
What this means for you
A letter swapped or missing is often one person typed twice; a mailbox check shows which one is real.
- Letters, swaps, extra characters
- Name and domain
- Digit-only pairs last
- Pairs as a CSV
- Typos
- Duplicates
- Lead list
By SimpleVerifier Team · Last updated · Runs in your browser; nothing you paste is sent to us
Similar pairs found, now check which address is real.
- Download the pairs, remove the wrong address of each, and keep the list.
- Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.
How do I find similar email addresses in a list?
- Upload the list as a CSV or .xlsx, or paste the cells with the header row first. It needs a column of email addresses.
- Press Find similar addresses.
- Read the pairs, grouped by how they differ. A swapped pair or a missing letter is often the same person typed twice.
- Download the pairs, keep the right address of each, then check what is left.
Example
- You enter
- Example list of eight addresses: john.smith, jon.smith and jonh.smith at example.com, ava at example.com and at exmaple.com, sales1 and sales2 at example.com, and dev at example.net.
- You get
- Eight addresses, 5 similar pairs, 4 of them likely typos: jon.smith and jonh.smith, john.smith and jon.smith, john.smith and jonh.smith, and ava@example.com and ava@exmaple.com. sales1 and sales2 differ by a digit only and are listed last.
- Limits
- Runs in your browser. It reads the text only and does not say which address of a pair exists.
What counts as near-duplicate?
Two addresses are a pair when they are one edit apart in the part before the @ on the same domain, or one edit apart in the domain with the same name before the @. The edit can be one letter changed (jon.smith and jon.smyth), two neighbouring letters swapped (jonh and john), one extra or missing character, or one digit changed (sales1 and sales2).
Pairs that differ by a digit only are listed last. Two people can share team1@ and team2@, so those need a human look.
Which one of a pair is right?
The tool does not choose. A mistyped domain such as gmial.com is fixed with the email typo corrector. For the rest, a mailbox check shows which of the two addresses accepts mail, and the other can go. To find the same person at different addresses by name, use the duplicate contact finder.
How is the list read?
Every cell is trimmed and lower-cased, cells that are not shaped like addresses are skipped, and exact duplicates are counted once; remove those first with remove duplicate emails. Names shorter than four letters and domains shorter than five characters are not compared, because short strings are one edit from many others. Read email typo correction for why typos reach a list.
Who uses this tool, and for what?
- Newsletter owners
- Find a sign-up typed twice with a slip, before you mail both.
- Sales ops
- Spot contacts entered by two reps with different spellings.
- Cold emailers
- Find near-twin addresses on a bought list that may be one person.
What can’t this tool tell you?
- It reads the text only; it cannot say which address of a pair exists.
- Only pairs one edit apart are found.
- Names under four letters and domains under five characters are not compared.
- Digit-only differences are often different people and are listed last.
Common questions
- Does it say which address is correct?
- No. It lists the pairs. A mailbox check shows which one accepts mail.
- Why are short names left out?
- A name with three letters or fewer is one edit from many others, so pairs would be mostly noise.
- Does it compare every address with every other?
- It compares addresses that share a domain or a name, which finds every pair one edit apart.
- What about addresses that differ by two characters?
- They are not listed. Only pairs one edit apart are shown.
- Is there a size limit?
- It reads the first 50,000 unique addresses and tells you how many were left out.
- Is my list uploaded anywhere?
- No. The list is read in your browser.
A tidy list can still be full of dead addresses.
Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.
- Upload the cleaned file as it is: CSVs up to 100,000 rows
- A real SMTP mailbox check on every row, with catch-all detection
- Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime
Plans from $9 a month, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.