UD5 Toolkit
CTR Calculator – Click Through Rate for Ads & Emails
Quickly compute click-through rate from impressions and clicks. Use it to measure ad performance, email campaign effectiveness, or organic search CTR.
Tag: Email Address Verifier
18+ toolsEmail Subject Line Tester – Preview & Length Check
Type your email subject line and see how it will appear on mobile and desktop inboxes. Checks character limits and flags spammy words for better open rates.
SPF Record Validator – Syntax Check & Limit Analyzer
Validate the syntax of an SPF record, check for the 10‑lookup limit, and flatten nested includes. Improve email deliverability by fixing SPF errors.
HTML Email Signature Builder - Online Professional Footer Creator
Create a polished HTML email signature with your photo, links, and company details. Live preview and copy HTML to clipboard. Works with Gmail, Outlook, Apple Mail.
Email Spam Trigger Checker - Online Avoid Spam Filters
Paste your email subject and body. The tool highlights common spam trigger words and gives a risk score. Improve inbox placement.
DMARC Record Generator - Online Email Policy Builder
Create a DMARC policy record with percentage, reporting addresses, and alignment mode. Validate and copy the final DNS TXT.
DKIM Record Generator - Online Public Key DNS Entry
Generate a DKIM DNS record from a public key and selector. Check syntax. Improve your domain’s email deliverability.
Email Header Analyzer - Online SPF, DKIM, DMARC Check
Paste raw email headers and see authentication results (SPF, DKIM, DMARC) in a readable table. Find spoofing attempts.
Markdown to Email HTML - Online Newsletter Template
Write in Markdown and get clean, inline‑styled HTML suitable for emails. Pre‑designed templates included. Local conversion.
Email‑Safe Button Generator – Online Inline CSS Bulletproof
Create colorful, bulletproof HTML buttons for email. Uses VML for Outlook, graceful fallback for others.
BIMI Record Generator - Online Brand Logo for Email
Generate a BIMI record to display your verified brand logo in email clients. Includes SVG logo URL and VMC certificate path.
Mailto Link Generator - Online HTML Email Link
Build a complex mailto: link with to, cc, bcc, subject, and body. Get the HTML anchor tag. Local.
Email Obfuscator - Online Protect Address from Bots
Hide your email address from scrapers by encoding it using HTML entities and CSS tricks. Still clickable for real users. Local generator.
Phishing Email Checker - Online Suspicious Link Analyzer
Paste email headers or body text to quickly spot phishing signs, suspicious domains, and obfuscated links. Educational and private.
SPF Record Generator - Online Email Authentication DNS
Build a valid SPF TXT record by selecting mail servers, IPv4/IPv6 ranges, and includes. Validate syntax and get ready‑to‑publish output.
Email Spam Score Checker - Online Newsletter Tester
Paste your email body and subject, and get a spam score based on common trigger words and patterns. Improve your cold outreach.
Email Permutator - Online Generate All Possible Addresses
Enter a first name and last name, plus a domain, to generate common email address patterns. For finding contacts.
Gravatar Generator & Checker - Online Email to Avatar
Preview the Gravatar image associated with any email address. Generate the correct Gravatar URL. Handy for avatar debugging.