Verify your email list before you send: clean it instantly in your browser, then check addresses against live mail servers. Free, with no signup.
Paste your email list
Files are parsed in your browser — your list is never uploaded.
Clean your whole list instantly — deduped, syntax-checked and flagged, entirely in your browser — then verify 10 addresses a day free against live mail servers.
Paste or upload your list
Paste up to 10,000 emails, or upload a .csv or .txt file — it's parsed in your browser, nothing is uploaded.
Clean it instantly
We dedupe, lowercase and syntax-check every address, and flag role accounts and free providers.
Verify addresses
Check your first 10 addresses a day against live mail servers, free — valid, invalid or catch-all.
Export and send
Download or copy the cleaned list, then verify the rest in bulk inside Emailchaser.
Email list cleaning is the fastest deliverability win there is. This tool deduplicates your list, lowercases and syntax-checks every address, and flags role accounts (info@, sales@, support@) and free personal providers (Gmail, Yahoo, Outlook) — instantly, for lists up to 10,000 rows.
Everything happens locally: the file you pick is read with your browser's own FileReader, and your list is never uploaded to any server. When cleaning is done, copy the results or download them as a .txt file with one click.
Paid bulk email verifier software checks every mailbox on your list by talking to the receiving mail server (an SMTP check). This free bulk email verifier runs the exact same check — the same engine that powers Emailchaser's product — on up to 10 addresses per day, so you can gauge the quality of a list before committing to anything.
When you're ready to verify the whole list, Emailchaser verifies thousands of addresses in one click, automatically, before every campaign sends — so a stale list never touches your bounce rate.
A clean email list is the difference between the inbox and the spam folder. Every send to a dead address counts as a bounce, and once your bounce rate creeps past 2-3%, providers like Google and Microsoft start filtering everything you send.
Addresses also go stale fast — people change jobs constantly — so cleaning isn't a one-off. Run your list through this tool before every campaign: dedupe it, drop the invalid syntax, decide what to do with role and free-provider addresses, and verify what remains.
How do I verify an email list?
Paste your list (or upload a .csv or .txt file) into the tool above. It instantly cleans the whole list — deduplicating, lowercasing and syntax-checking every address — then verifies your first addresses against the live mail server, one at a time, so you know which mailboxes can actually receive email. To verify thousands at once, sign up for Emailchaser and every address is verified in bulk before your campaign sends.
Is my email list uploaded anywhere?
No. List cleaning runs 100% in your browser — files are read locally with your browser's FileReader, and the list never leaves your device. Only the individual addresses you explicitly choose to verify are checked, one at a time, against our verification service.
How many email addresses can I verify for free?
Cleaning is unlimited and instant, for lists up to 10,000 rows. Live SMTP verification is free for up to 10 addresses per day. If you need your whole list verified, sign up for Emailchaser — it verifies thousands of addresses in one click before every campaign.
What do valid, invalid and catch-all mean?
Valid means the mailbox exists and can receive email, so it's safe to send. Invalid means the address doesn't exist and will bounce — remove it before sending. Catch-all means the domain accepts mail for every address, so the specific inbox can't be confirmed; treat these as risky. Unknown means the mail server didn't give a definitive answer in time.
Why remove role and free-provider addresses before cold outreach?
Role accounts like info@ or sales@ are shared inboxes — they rarely reply, are watched by spam filters, and are more likely to report you. Free-provider addresses (Gmail, Yahoo, etc.) are usually personal accounts, not the business decision-maker you're targeting in B2B outreach. Flagging both lets you focus your sends on real, individual work addresses.
What bounce rate is safe for cold email?
Keep your bounce rate under 2-3%. Above that, mailbox providers like Google and Microsoft start treating your domain as a spam risk, which pushes even your good emails to the spam folder. Verifying your list before every send is the most reliable way to stay under that threshold.
Address: 151 Calle de San Francisco San Juan, Puerto Rico
Email: support@emailchaser.com
Product
Cold Email SoftwareEmail FinderCampaignsSales CRMLead FinderEmail AccountsEmail VerifierCold Email APIMCP ServerAPI documentationComparisons
Best cold email softwareInstantly alternativesSmartlead alternativesInstantly vs EmailchaserSmartlead vs EmailchaserHunter vs EmailchaserFree tools
All free toolsBulk Email VerifierDeliverability TestEmail Header AnalyzerSMTP Settings FinderCold Email TemplatesBoolean Search BuilderName SplitterCompany Email FormatSpam Word CheckerInternational
Cold email (ES)Cold email (FR)Cold email (DE)Cold email (IT)Cold email (PT)Verifica email (IT)© Copyright 2026 Emailchaser