Free Email tools

Email tools

Write subject lines that land and read the metrics that matter.

Email Subject Line Tester

Score your subject line for length, spam triggers and open appeal.

Email Marketing Metrics Calculator

Get open rate, CTR, click-to-open, conversion and revenue per email.

Email Signature Generator

Create a clean HTML email signature for Gmail, Outlook & Apple Mail.

Email List Growth Calculator

Project your list size from sign-ups and churn, and see your real growth rate.

Email Spam Word Checker

Scan your subject and body for spam-trigger words before you hit send.

Email Preheader Tester

See how your preview text gets cut off in Gmail, Apple Mail and Outlook.

Email Footer Generator

Build a CAN-SPAM-compliant footer with address and unsubscribe in seconds.

HTML to Plain Text Converter

Strip an HTML email to a clean plain-text version for the text part.

About these email tools

Email is still the highest-ROI channel in marketing, but small mistakes quietly cap it — a subject line that trips a spam filter, a signature that breaks in Outlook, or metrics you can't actually interpret. These tools fix exactly those: scoring your subject line for length and spam triggers before you send, turning raw sends and opens into the rates that tell you what's working, and building a clean HTML signature that renders the same everywhere. Free, no account, nothing you enter leaves your browser.

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AgentOutreach.io

One email is easy. AgentOutreach finds your ideal prospects and runs personalized outreach campaigns from your own inbox.

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