25 free browser-based tools for validating, writing, analyzing and sending better email — nothing you paste is ever uploaded to a server.
Free email validator that checks syntax, domain formatting and typo-squatting risk instantly in your browser — no data ever leaves your device.
Generate random, realistic-looking placeholder email addresses for QA testing, form demos and sample data — no real inbox is created.
Build a clean, professional HTML email signature with live preview and copy-ready code — works in Gmail, Outlook and Apple Mail.
Validate an entire list of email addresses at once — flag invalid formats, duplicates and disposable domains, then export the clean list.
Paste raw email headers to see the full delivery path, SPF/DKIM/DMARC authentication results, and key metadata in a readable table.
Scan an email subject line and body copy for spam-trigger words, aggressive formatting and structural red flags before you hit send.
Pull every email address out of pasted text, HTML source or scraped content, de-duplicated and ready to copy.
Combine a message template with a CSV contact list to generate personalized emails, previewed instantly and exportable as a text file.
Detect a company's email naming pattern from one known address, then predict the likely address for anyone else at the same domain.
Look up the mail exchange (MX) servers configured for any domain in real time using a public DNS resolver.
Run an email address through format, disposable-domain, role-account and live MX record checks in a single deliverability score.
Score an email subject line on length, spam-trigger words, punctuation and personalization to predict how it'll perform in the inbox.
Generate a responsive, table-based HTML newsletter template with live preview, ready to paste into your email service provider.
Generate the most likely corporate email address patterns for a person, given their name and a company domain.
Paste your email's HTML to confirm it contains a working, visible unsubscribe link and check for the List-Unsubscribe header.
Generate Gmail dot-trick and plus-tag alias variants of your address — all deliver to the same inbox, useful for filtering and tracking signups.
Trim whitespace, normalize case, strip invisible characters and remove duplicates from a raw email list in one pass.
Pull the unique domains out of a list of email addresses, with counts and percentage share for each — useful for auditing a contact list.
Instantly check whether an email address uses a free consumer webmail provider or a custom business domain.
Check your subject line and preview/preheader text against real character cutoffs for Gmail, Outlook, Apple Mail and Yahoo.
Generate a clear, professional out-of-office or auto-reply message with dates, reason and an emergency contact, in three tone options.
Split a large email list into smaller batches of a set size — useful for staying under daily sending limits or manual BCC caps.
Format a messy list of addresses into a clean comma or semicolon-separated string, and check it against common provider recipient limits.
Convert plain-text email copy into clean, properly formatted HTML with paragraphs and clickable links, live preview included.
Compare an email's From and Reply-To addresses to spot mismatched domains — a common signal used in phishing detection.