Free Email Tools by Sendcraft

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Subject Line Tester

Score your subject line on length, spam signals, reader pull and more - with specific ways to improve it.

Open tool → New

Subject Line Generator

Get a dozen strong subject lines for your topic, in the angle and tone that fit your email.

Open tool → New

Email Signature Generator

Build a clean, professional HTML signature in a minute and paste it into Gmail, Outlook or Apple Mail.

Open tool → New

Open Rate Calculator

Open rate, click rate, click-to-open, conversion rate and email ROI - every core email metric in one place.

Open tool → New

Email CTA Generator

Clear, clickable calls to action for your email - button text and sentence CTAs that match your goal.

Open tool → New

Inbox Placement Test

Pre-send check: scan your email for the signals that push messages toward spam before you hit send.

Open tool → New

DMARC Record Generator

Answer a few questions, get a correct DMARC TXT record for your domain, plus the steps to publish it.

Open tool → New

Preview Text Generator

Write preview text that works with your subject line instead of repeating it - with a live inbox preview.

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Why these tools exist

Good email is mostly a series of small, fixable decisions: a subject line that earns the open, preview text that backs it up, a call to action people understand, a domain that proves it is really you. Most of those decisions take under a minute once someone shows you what to look at. That is what this library is for.

Every tool here follows the same rules. It is free. It runs entirely in your browser, so the text you paste is never uploaded or stored. And it tells you not just what to change, but why - because the point is to make your next email easier, not to keep you coming back for answers you could have learned once.

How to use the library

If you are about to send something, start with the Subject Line Tester and the Inbox Placement Test: together they catch the most common reasons emails underperform. If you are setting things up, the DMARC Record Generator and Email Signature Generator handle the one-time technical and branding basics. The calculators and generators are for the work in between - writing faster and knowing whether it worked.

Frequently asked questions

Are these email tools really free?

Yes. Every tool on this page is free to use with no account required. Optional extras, like additional subject line variations, are unlocked by joining the free Sendcraft email list.

Do the tools store what I type?

No. All checks and generators run entirely in your browser. Text you paste, like a subject line or email draft, never leaves your device.

Who are these tools for?

Solo creators, newsletter writers and small business owners who send their own email and want practical help with subject lines, deliverability, signatures and email metrics.