Pull publicly visible emails off any page — straight into CSV.
LeadsBlue Email Finder is a free browser extension that scans the page you are already viewing for public email addresses and lets you copy them or export to a CSV file. Everything runs locally in your browser. No account, no upload, no server-side processing. Built by the team at LeadsBlue, who also publish 434 bulk B2B and consumer email databases across 140+ countries.
Why we built this
LeadsBlue sells bulk B2B and consumer email databases. That is the core business and has been since 2018. But not every email-research job is a bulk job. Some days you are on a single trade-association directory, a conference attendee page, or a regional chamber-of-commerce listing — and you just want the addresses already visible on that page in a usable format.
For those small jobs you used to have three options: copy and paste manually, install something heavyweight that wanted access to every tab and every cookie, or hand the URL to an online scraper that uploaded the page to a server you do not control. We were not happy with any of them, so we built the smallest extension that solved the smallest version of the problem.
How the extension actually works
We get this question a lot, so here is the technical answer in plain English. The extension is roughly 70 lines of JavaScript plus the popup UI:
icon@2x.png), and lowercase the result.What is in the toolbar popup
Scans the active tab the moment the popup opens. Most pages return results in under 200 milliseconds. There is no scan button to press.
Copy the deduplicated list as plain text, or download a CSV with one column (email) ready to import into HubSpot, Mailchimp, Smartlead, Instantly, Apollo, or any CRM.
Enter a name and a domain (for example Jane Doe + acme.com) and the helper generates the eight common business-email formats: jane@, j.doe@, jane.doe@, etc. Useful when a contact page lists names but not addresses.
Toggle to hide common no-reply, info, and webmaster prefixes. Filter by domain when a page has emails from multiple companies. The filters never leave the popup.
What this extension is — and what it is not
Following the same honest framing we use on every LeadsBlue product page, here is what to expect and what not to expect:
LeadsBlue Email Finder IS | LeadsBlue Email Finder is NOT |
|---|---|
✓ A simple on-page extractor for emails already publicly displayed | ✗ A crawler — it does not follow links or visit pages on its own |
✓ Local-only — every operation runs in the browser sandbox | ✗ A real-time validator — it does not ping mail servers to verify addresses |
✓ Manifest V3, two narrow permissions, open install on both stores | ✗ A LinkedIn / Facebook / Twitter scraper — those domains are excluded |
✓ Free, with no signup or paywall | ✗ A replacement for ZoomInfo, Apollo, or our own bulk databases when you need volume |
✓ Available on Chrome Web Store and Firefox AMO worldwide | ✗ A managed outreach service — sequencing and sending are your job |
We are direct about this because it saves everyone time. If you reached this page expecting a Hunter.io / Apollo equivalent, the bulk databases at leadsblue.com/leads are the closer match. If you reached this page expecting a small, fast, private tool for on-page extraction, this is exactly that.
Compliance and privacy
Email marketing law is local and the obligations differ depending on whether you are sending B2B or B2C, and where the recipient is based. We are not lawyers and the extension does not give legal advice. What it does give you is a clean starting point: every email you collect has been displayed on a publicly accessible web page that you visited yourself in your own browser. The major frameworks you should know about:
For B2B outreach in most countries, legitimate interest is an accepted lawful basis for contacting a corporate email address — and a published business contact has a strong claim to being just that. For consumer email outreach in the EU, UK, and Canada the obligations are stricter and explicit consent is normally required. The extension does not change those obligations downstream; it just gives you a cleaner, more transparent way to collect what is already public.
What the extension does not do
- It does not read pages you have not opened.
- It does not access browser history, cookies, passwords, or saved cards.
- It does not run on social-network domains.
- It does not phone home — there is no analytics endpoint to disable, because there is no analytics endpoint.
- It does not enrich, append, or look up data from a third-party API.
How it compares to typical email-extractor extensions
What to compare | LeadsBlue Email Finder | Typical extractor |
|---|---|---|
Where data is processed | In your browser | Sent to vendor servers |
Permissions requested | activeTab + scripting | Often "all sites" + cookies + history |
Speed on a single page | Sub-second | Multi-step crawl, often slow |
Output format | Plain CSV, you own the file | Locked behind credit-tier paywall |
Browser availability | Chrome and Firefox | Often Chrome only |
Pricing | Free, no signup | Credit-based with monthly cap |
Who actually uses this
Roughly 60% of installs come from the United States, United Kingdom, Canada, Australia, Germany, and India, with the remainder spread across Western Europe, Southeast Asia, Latin America, and the Middle East. Based on user feedback in the store reviews and direct messages to support, four use patterns dominate:
Pulling hiring-manager emails from company "Careers" pages, individual job postings, and About-Us pages. Smaller scale than agency outreach but high-relevance.
Building one-off prospect lists from trade directories, SaaS marketplace listings, and partner pages. Usually under 1,000 contacts per project.
Collecting media-contact emails from news-site staff pages and press-room listings ahead of a launch or campaign. Often combined with the Pattern Helper.
Saving exhibitor and speaker contact details from conference and expo websites, where the organiser publishes attendee or sponsor lists.
Sensible practices for outreach
Whatever you do with the CSV after export is on you, but a few practices keep reply rates up and complaints down. They are not specific to this extension — any cold-email playbook from the last decade will say the same:
- Validate before sending. Run the list through NeverBounce, ZeroBounce, or Millionverifier. Bounce rate above 5% will shred your sender reputation.
- Warm up new sending domains. Mailwarm, Smartlead's built-in warmup, or Instantly's tools all do the job.
- Send from a domain you do not mind burning. Use a secondary sending domain pointed at the same brand, never your primary.
- Always include a working unsubscribe link. Required by CAN-SPAM in the US; also required by GDPR / UK GDPR / CASL implicitly.
- Personalise beyond first name. Reference the page you found them on. It is also the honest answer if anyone asks how you got their email.
- Stop sending if asked. Maintain a suppression list and honour it across all future campaigns, not just the current sequence.
Frequently asked questions
Yes. There is no paid tier, no credit limit, no signup. We publish bulk databases as the paid product. The extension is a free side tool that the team wanted internally and decided to ship publicly.
No, by design. Social networks are excluded at the manifest level. Both platforms' terms of service prohibit automated extraction, and we do not want to ship a tool that gets users into trouble or violates platform rules.
Two: activeTab (read the current tab when you click the icon) and scripting (run the extraction script in that tab). It does not request "read your browsing history", "read and change all your data on the websites you visit", or any of the broader permissions that flag concern in Chrome's review process.
No. It returns whatever email-shaped strings appear on the page, deduplicated. Validation is a separate step and we recommend NeverBounce, ZeroBounce, or Millionverifier for that. Treat the extension's output as raw input, the way you would with any extractor.
Yes — the content script reads the rendered DOM, not the source HTML. As long as the email is visible on the page when you click the icon, it will be picked up. Pages that obfuscate emails (replacing @ with [at], for example) will not match the regex; that is intentional, since deobfuscation crosses a clear ethical line.
Currently CSV and clipboard copy. JSON export is on the short list. If you have a specific need (TSV, vCard, direct push to a CRM), tell us via the contact form.
By the LeadsBlue team. The same group that has been compiling B2B and consumer email databases since 2018. Support runs through the live chat on leadsblue.com/contact seven days a week.
Nothing — there is no account to deactivate, no data on our servers to delete, and no residual storage. Browser uninstall removes everything.
Install in under ten seconds
Free, local-only, two permissions. Available on Chrome and Firefox.