Every email verifier on this list will check some addresses for free, but “free” comes in three shapes, and the shape matters more than the number. Some vendors hand you a one-time batch of email verifier free credits at signup (Emailable’s 250, MillionVerifier’s and Clearout’s 100). Some refill the allowance every month (ZeroBounce and Hunter, 100 checks each). Two refill it every day: Verifalia gives 25 a day, Reoon 20 a day plus 100 at signup.
What is any of it good for? Testing a verifier’s accuracy on a sample of your own list before you pay, cleaning a small list, and one-off checks before you hit send. What it is not good for is cleaning a 50,000-row export. Below: the seven free tiers as they stood in September 2026, grouped by how they renew, and when free stops making sense.
How we compared these free tiers
Everything here was read from the vendors’ own pricing or product pages on 2 and 3 September 2026. Free plans change more often than paid ones (Verifalia updated its Free Plan terms in December 2025), so treat this as a snapshot and click through before relying on a number.
A credit means one address checked once. Where a page didn’t say whether a card is needed, the table says “not stated”.
Two more things. We build Reoon Email Verifier, which is one of the seven; we’ve kept to published figures you can check yourself, and Reoon sits where its type of free tier places it in the list, not at the top. And no accuracy claim below is a test result; every vendor in this market, us included, self-reports it, which is exactly why a free tier is worth having: it lets you measure instead of trust.
Email verifier free credits at a glance
| Vendor | Free allowance | Renews? | Card required? | Notes |
|---|---|---|---|---|
| Emailable | 250 credits at signup | No, one-time | Not stated | Credits never expire; unknown results refunded |
| MillionVerifier | 100 credits at signup | No, one-time | No | Risky results (unknown and catch-all) not charged |
| Clearout | 100 credits at signup | No, one-time | No | API limited to 3 requests a minute on the free plan |
| ZeroBounce | 100 credits a month | Monthly | Not stated | Offered for signups with a business/premium domain; unknowns free |
| Hunter | 50 credits a month, half a credit per check (up to 100 checks) | Monthly | Not stated | Credits shared with the email finder; same address counted once per billing period |
| Verifalia | 25 credits a day | Daily, reset at midnight GMT | Not stated | Unused daily credits do not accumulate; High and Extreme checks cost 2 and 4 credits |
| Reoon | 20 credits a day plus 100 at signup (up to 600 a month) | Daily | No | Unknown results not charged; purchased credits never expire |
One-time signup credits
The simplest kind: you register, a fixed number of credits lands in the account, and when they’re gone you buy more. Good for one small job or a first accuracy test, less so for week-after-week checking.
Emailable: 250 credits, once
The biggest one-time batch of the seven. Emailable’s pricing page lists 250 free credits on account creation, and credits never expire, so there is no rush. Unknown results (addresses whose mail server wouldn’t give a clear answer) are refunded, which stretches the batch on a corporate-heavy sample. The limit is the one every one-time tier shares: a decent test sample, then it’s over. The page doesn’t say whether a card is needed.
MillionVerifier: 100 credits, once
MillionVerifier gives 100 free credits with no credit card, and the credits don’t expire. The charging policy is the strength: risky results, meaning unknowns and catch-all addresses (a catch-all domain accepts mail for any name, so a verifier can’t tell a real inbox from a typo), are not charged, so on a B2B sample 100 credits can check noticeably more than 100 addresses. The limit is the size; 100 is enough for a first look but thin for a proper test.
Clearout: 100 credits, once
Clearout’s freemium plan is 100 credits for the lifetime of the account, one time, no expiry, no card. The catch sits in the API: the free plan is rate-limited to 3 requests a minute. (An API lets your own software send addresses to the verifier automatically; the rate limit caps how many requests a minute it accepts.) Three a minute is fine for confirming an integration works and useless for anything live.
Monthly-renewing credits
A monthly refill turns the free tier into a small standing allowance you can count on.
ZeroBounce: 100 credits a month
ZeroBounce’s Freemium plan refills 100 validation credits every month, and unknown results are free. It also throws in one inbox placement test, one blacklist monitor and 10 email finder credits a month, a taster of the wider toolkit. The condition to read carefully: the page offers the 100 monthly verifications “when you sign up with a business/premium domain”. It doesn’t say what a Gmail signup gets, so check first. Card requirement isn’t stated.
Hunter: up to 100 checks a month, inside a bigger toolkit
Hunter is a lead-finding tool with verification built in. Hunter’s pricing page gives 50 credits a month and charges half a credit per verification, so the allowance is up to 100 checks if you spend none of it on searches. A nice detail: the same address verified twice in a billing period is counted once. The limit is the shared pot; if you use Hunter to find addresses, verification eats into it. Card requirement isn’t stated.
Daily-renewing credits
The rarest kind, and the most useful if your need is ongoing rather than one-off.
Verifalia: 25 credits a day
The largest daily number here, and we’ll say that plainly. Verifalia’s Free plan gives 25 free credits each day, reset at midnight GMT, and the page describes this as “sufficient for most clients’ testing needs”. All three of Verifalia’s quality levels are available on the free plan, which is unusual. Two things to know: unused daily credits expire at the end of the day and never accumulate, and the higher quality levels cost more credits (High is 2 per check, Extreme is 4), so 25 credits at Extreme is six addresses. Verifalia also flagged a Free Plan terms update in December 2025, so read the current terms before building a routine around it. Card requirement isn’t stated.
Reoon: 20 credits a day plus 100 at signup
Our own entry. Reoon Email Verifier states 20 credits every day for the life of the account, 100 instant credits at signup, up to 600 free verifications a month, and no credit card required. Treat the 20 as a use-as-you-go allowance; the monthly figure is simply 20 times 30. Unknown results are never charged, and purchased credits don’t expire if you later buy some. The strength, as we see it, is the combination: 100 to run a real first test on day one, then a daily 20 that keeps going. The honest limit: on the daily number alone, Verifalia’s 25 beats our 20, so the choice is between a bigger daily figure and a signup batch plus a steady one. Accuracy is advertised at 99%+, a self-reported figure like every other on this page.
What a free tier is actually good for
Free credits are for finding out, not for cleaning up. Four jobs suit them.
- Testing accuracy on your own addresses. Build a sample of 100 to 200 addresses you already know the truth about: customers who replied (good), addresses that hard-bounced last month (bad), a few catch-all domains. Run it through two or three free tiers and compare the verdicts. Our guide to testing email verifier accuracy covers the method in about an hour, and every tier above has enough credits for it, some barely.
- Small lists. A 150-person event list or a 300-subscriber newsletter fits inside Emailable’s 250 or a couple of weeks of any daily allowance.
- One-off checks. The prospect’s address before the email that matters.
- Proving an integration. Before connecting a signup form to a verifier’s API, you want real responses; Clearout’s 3-a-minute limit and Reoon’s daily 20 both cover that.
What free tiers don’t do is clean a 50,000-row export. At 20 a day that is nearly seven years; at 250 one-time it is half a percent of the list. Splitting the job across seven free accounts is a false economy too: seven result files and no consistent standard to judge them by. At that point you are buying credits, and the useful questions become price per thousand, credit expiry and whether unknowns are charged. Our breakdown of email verification pricing covers those.
One more honest note. Vendors don’t give credits away out of kindness; a free tier is a sales tool, and it works best for the vendor when the product looks good on your data. That’s fine, as long as you test on your own sample rather than a demo list. For the wider criteria (catch-all handling, disposable detection, data handling, support), our guide to choosing an email verification service has them.
Why a renewing daily allowance suits ongoing testing
The type of free tier you want depends on when you’ll need it. Once, and a one-time batch is fine; Emailable’s 250 is the largest single lump on the list. Steadily, and something has to refill.
The pattern we see most in small teams: they don’t verify in one big burst. A few signups a day, a dozen outreach emails a week, a small CSV import now and then. That is a trickle, and a trickle is what a daily allowance is for. (Our post on real-time versus bulk verification explains which setup fits a form-driven need.) Twenty checks a day covers most of that without a card, indefinitely, and the 100 signup credits let you run the accuracy test first.
Where Reoon fits: 20 credits a day for the life of the account, 100 instant credits at signup, unknown results never charged. Those are the product-page facts, stated the way we stated everyone else’s. If they sound like a fit, you can create a free account, run your known-good and known-bad sample today, and decide from the results. If another tier here suits your rhythm better, use that one; the point is that you can find out for nothing.
FAQ
Which email verifier gives the most free credits?
It depends on the kind. For a one-time batch, Emailable’s 250 credits at signup is the largest here. For a daily refill, Verifalia’s 25 a day is the biggest daily number, while Reoon’s 20 a day comes with 100 instant credits, so Reoon gives more in the first month and Verifalia more per day. ZeroBounce and Hunter both work out to 100 checks a month.
Do free email verification credits expire?
Daily credits do: Verifalia’s expire at midnight GMT if unused, and Reoon frames its 20 a day as a running allowance rather than a bank. Monthly credits at ZeroBounce and Hunter refill rather than accumulate. One-time signup credits at Emailable, MillionVerifier and Clearout are stated as never expiring. Check the vendor’s page, because free plan terms change more often than paid ones.
Can I clean my whole email list for free?
Only if it’s small. A few hundred addresses fit inside a one-time batch or a couple of weeks of a daily allowance. Tens of thousands don’t; at 20 a day, 50,000 addresses would take years, and splitting it across several free accounts gives inconsistent results. For a big list, compare paid rates and treat the free tier as where you test accuracy first.
Do I need a credit card for a free email verifier trial?
Not at every vendor. Reoon, MillionVerifier and Clearout state that no credit card is required for the free tier. Emailable, ZeroBounce, Hunter and Verifalia don’t say either way on their pricing pages as of September 2026, so check the signup form. A free tier without a card is also the lower-risk way to test, since there is nothing to cancel afterwards.
