Email subject checker
Enter a subject to count its characters and review the length warning.
Email tools
Extract email addresses, deduplicate and group lists, check subject lines, inspect headers and bounce messages, and create signatures or mailto links. Choose a tool for each email task. Choose a tool below for your task. Developer collections also offer subgroups. Check the individual tool page for supported inputs and processing details.
Mailto link generator
Enter recipients, Cc, Bcc, subject and body to copy a mailto URL or HTML link.
Email signature generator
Enter your name, role, email and HTTP or HTTPS website, choose a color and copy the preview.
Sample email generator
Choose a domain and quantity, or import UTF-8 TXT usernames, then copy or download sample addresses.
Email address checker
Paste addresses to inspect syntax, case-insensitive duplicates and common domain typos.
Email header analyzer
Paste raw headers or EML text to inspect Received hops, time differences and reported authentication.
Email bounce analyzer
Paste a bounce message to identify SMTP codes and read troubleshooting guidance.
Email content checker
Enter a subject and text or HTML to review links, missing image descriptions and promotional wording.
Email DNS checker
Enter a domain and DKIM selector to query MX, SPF, DKIM and DMARC or draft SPF and DMARC records.
Email privacy and link checker
Paste text or HTML to mask email addresses or inspect actual link hosts and structural warnings.
Email list operations
Paste lists A and B, choose union, intersection or A minus B, then copy or export CSV or Excel.
Email address extractor
Paste content or select TXT, CSV, HTML and EML files to extract unique email addresses.
Email template composer
Enter brand, heading, message, button and footer details to generate HTML or plain text.
HTML email and inline CSS
Paste HTML, preview at 600 or 375 pixels and inline supported computed styles at that width.
Email extraction and grouping
Paste text or HTML, extract unique addresses, group by quantity or domain and export TXT, CSV or Excel.