Email Whitelist Filter

The Email Whitelist Filter keeps only the addresses on your list that match an approved set of emails or domains, discarding everything else. It is the allow-list counterpart to blacklisting: instead of naming the addresses you want to block, you name the ones you want to keep, and the tool removes anything that is not explicitly permitted.

This approach is ideal when you have a strict definition of who belongs in a list. You might keep only addresses from your own company domains, restrict a distribution to a set of partner organisations, or filter a mixed export down to a handful of approved providers. Because the whitelist accepts domains as well as full addresses, you can permit an entire organisation with a single entry. A statistics panel shows how many addresses were checked, allowed, and removed.

Everything runs locally in your browser using JavaScript, so neither the list nor the whitelist is uploaded or stored. Matching is case-insensitive so capitalisation never causes a valid address to be dropped, and an optional alphabetical sort tidies the surviving addresses so the allowed list is ready to use immediately.

Features

• Keeps only the addresses whose full email or domain appears on your approved whitelist, removing the rest.
• Permits an entire organisation or provider with a single domain entry rather than listing every mailbox.
• Accepts a whitelist that freely mixes full email addresses and bare domains in the same box.
• Matches addresses and domains case-insensitively so a permitted entry is never dropped over capitalisation.
• Offers an optional alphabetical sort so the surviving allowed addresses come out tidy and ordered.
• Shows a live statistics panel counting the addresses checked, those allowed, and those removed.
• Runs entirely in your browser so both your list and your whitelist stay private on your own device.

How to use Email Whitelist Filter

1. Paste the email list you want to filter into the first input box on the left.
2. Paste your whitelist into the second box, mixing approved addresses and bare domains as needed.
3. Enable Sort A to Z if you want the surviving allowed addresses arranged alphabetically.
4. Click the Filter list button to keep only the addresses permitted by your whitelist.
5. Read the statistics panel to confirm how many addresses were allowed and how many were removed.
6. Copy the allowed list to your clipboard, or export it as a TXT or CSV file for import.

Benefits

• Enforces a strict allow-list so only pre-approved senders or domains ever reach your final list.
• Restricts distribution to your own company or trusted partners with a single domain entry each.
• Cleans mixed exports down to just the addresses you actually want, in one quick pass.
• Avoids accidental exclusions because permitted addresses and domains are matched case-insensitively.
• Keeps sensitive lists and whitelists private since everything is processed locally with no uploads.
• Produces a tidy, optionally sorted output that is ready to import into another tool or platform.

A whitelist entry is treated as a domain unless it contains an at sign, in which case it is an exact address. So example.com allows every mailbox at that domain, while ceo@example.com allows only that one person. You can combine both styles freely, separating entries with new lines, commas, semicolons, or spaces, and a leading at sign on a domain is handled without trouble.

Whitelisting is stricter than blacklisting because anything not explicitly allowed is removed. That makes it the right choice when you can define exactly who belongs, such as internal-only distributions or partner-restricted lists, but it also means a missing whitelist entry silently drops legitimate contacts. Double-check the counts in the statistics panel to confirm the result matches what you expected before you rely on it.

All filtering happens with JavaScript in your browser, so neither your list nor your whitelist is transmitted or saved, keeping the tool safe for confidential data. For the opposite approach, use the Email Blacklist Matcher to block named addresses and domains instead, or the Business Email Filter and Personal Email Filter to separate lists by provider type.