EMBED
Put our free tools on your own site
Add the subject line checker, the email footer checker and other tools to your website or blog with one copy-and-paste snippet, so your clients or members can use them right there.
Free, no sign-up
There is no cost and no account to create. Copy the code and paste it.
No ads
The only addition is a small “Powered by Newsletter Ready” line with a link.
Inputs stay in the browser
What visitors type is processed in their own browser and is never sent or stored.
Live preview (subject line checker)
This is how it looks once pasted — fully working.
Great for
- Accountants, consultants and agencies who help small businesses with marketing
- Web design studios: on client help pages or blog posts
- Chambers of commerce and trade associations: on member resource pages
- Blogs and media writing about email marketing, so readers can try things as they read
How to add a tool (3 steps)
- Pick a tool below, open “Show embed code” and copy it.
- Paste it wherever your site accepts HTML (WordPress: Custom HTML block; Wix: Embed → Embed HTML; Squarespace: Code block; Webflow: Embed element).
- Publish. The height adjusts to the content automatically (if your platform strips scripts, it shows at a fixed 560px).
Tools you can embed
These tools run entirely in the browser. They all use the same kind of snippet.
Subject line checker
Check length, where your subject gets cut off on phones and common spam signals, with an inbox preview.
Open the tool page →Show embed code
<iframe src="https://newsletterready.com/embed/en/subject" title="Free Email Subject Line Checker: Length, Mobile Preview and Spam Signals" width="100%" height="560" style="border:0;max-width:720px" loading="lazy"></iframe>
<p style="font-size:12px">Powered by Newsletter Ready | <a href="https://newsletterready.com/tools/subject-line-checker">Free Email Subject Line Checker: Length, Mobile Preview and Spam Signals</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://newsletterready.com"||!e.data||e.data.type!=="newsletter-ready:height")return;document.querySelectorAll('iframe[src^="https://newsletterready.com/embed/"]').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.height+"px"})})</script>Email footer compliance checker
Paste your newsletter footer and see whether it has what CAN-SPAM requires: sender identification, a physical postal address and a clear way to opt out.
Open the tool page →Show embed code
<iframe src="https://newsletterready.com/embed/en/footer" title="Free Email Footer Compliance Checker (CAN-SPAM)" width="100%" height="560" style="border:0;max-width:720px" loading="lazy"></iframe>
<p style="font-size:12px">Powered by Newsletter Ready | <a href="https://newsletterready.com/tools/email-footer-checker">Free Email Footer Compliance Checker (CAN-SPAM)</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://newsletterready.com"||!e.data||e.data.type!=="newsletter-ready:height")return;document.querySelectorAll('iframe[src^="https://newsletterready.com/embed/"]').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.height+"px"})})</script>Email footer generator
Enter your business name, address and unsubscribe link to get a CAN-SPAM-ready footer as text or HTML.
Open the tool page →Show embed code
<iframe src="https://newsletterready.com/embed/en/footer-gen" title="Free Email Footer Generator for CAN-SPAM Compliance" width="100%" height="560" style="border:0;max-width:720px" loading="lazy"></iframe>
<p style="font-size:12px">Powered by Newsletter Ready | <a href="https://newsletterready.com/tools/email-footer-generator">Free Email Footer Generator for CAN-SPAM Compliance</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://newsletterready.com"||!e.data||e.data.type!=="newsletter-ready:height")return;document.querySelectorAll('iframe[src^="https://newsletterready.com/embed/"]').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.height+"px"})})</script>Consent wording generator
Get sign-up checkbox text and a double opt-in confirmation email for the US, UK, EU, Canada, Australia, Japan, South Korea or Taiwan.
Open the tool page →Show embed code
<iframe src="https://newsletterready.com/embed/en/consent" title="Newsletter Consent Wording Generator: Checkbox Text and Double Opt-In Email" width="100%" height="560" style="border:0;max-width:720px" loading="lazy"></iframe>
<p style="font-size:12px">Powered by Newsletter Ready | <a href="https://newsletterready.com/tools/consent-wording">Newsletter Consent Wording Generator: Checkbox Text and Double Opt-In Email</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://newsletterready.com"||!e.data||e.data.type!=="newsletter-ready:height")return;document.querySelectorAll('iframe[src^="https://newsletterready.com/embed/"]').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.height+"px"})})</script>Newsletter metrics calculator
Enter the numbers from one send to calculate open, click, unsubscribe, bounce and spam complaint rates, with verdicts against the Gmail and Yahoo thresholds and other published guidance.
Open the tool page →Show embed code
<iframe src="https://newsletterready.com/embed/en/metrics" title="Newsletter Metrics Calculator: Open, Click, Unsubscribe, Bounce and Complaint Rates" width="100%" height="560" style="border:0;max-width:720px" loading="lazy"></iframe>
<p style="font-size:12px">Powered by Newsletter Ready | <a href="https://newsletterready.com/tools/newsletter-metrics-calculator">Newsletter Metrics Calculator: Open, Click, Unsubscribe, Bounce and Complaint Rates</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://newsletterready.com"||!e.data||e.data.type!=="newsletter-ready:height")return;document.querySelectorAll('iframe[src^="https://newsletterready.com/embed/"]').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.height+"px"})})</script>Newsletter consent checker
Choose where the recipient is and how you got their address (sign-up form, business card, customer, published address, bought list and more) to see whether you can email them, under what conditions, and what to include and record. Covers the US, EU, UK, Canada, Australia, Japan, South Korea and Taiwan.
Open the tool page →Show embed code
<iframe src="https://newsletterready.com/embed/en/consent-check" title="Can I Send Them My Newsletter? Consent Checker for 8 Countries and Regions" width="100%" height="560" style="border:0;max-width:720px" loading="lazy"></iframe>
<p style="font-size:12px">Powered by Newsletter Ready | <a href="https://newsletterready.com/tools/email-consent-checker">Can I Send Them My Newsletter? Consent Checker for 8 Countries and Regions</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://newsletterready.com"||!e.data||e.data.type!=="newsletter-ready:height")return;document.querySelectorAll('iframe[src^="https://newsletterready.com/embed/"]').forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.height+"px"})})</script>FAQ
Does it cost anything?
No. There is no sign-up, and it stays free no matter how many pages you add it to or how many people use it.
Will ads appear?
No. Below the tool there is a “Powered by Newsletter Ready” line and a link to the tool page. Please keep that link in place.
What happens to what visitors type?
Subjects, text and numbers are processed in the visitor’s browser and are not sent to our servers or stored. No analytics or ad tags run inside the embed. When a tool is used we only receive which tool, the page and the language, to understand usage.
Does it work outside WordPress?
Anywhere you can paste HTML: Wix, Squarespace, Webflow, Ghost and more. Some platforms remove scripts; the tool still works, only the height stays fixed.
Can I change the look or language?
The language follows the page you copied the code from (the English page gives English). Colours and wording can’t be changed.