Embed the converter
Put the Numerus Roman numeral converter on your own site with a single line of HTML. Copy a snippet, paste it in, and your readers get a live two-way converter.
Live preview
This is exactly what your visitors will see.
Fixed width snippet
Best when you have a set space for the widget.
<iframe
src="https://romannumerals.app/widget"
title="Roman numeral converter by Numerus"
width="440"
height="200"
loading="lazy"
style="border:0;max-width:100%;"
></iframe>Responsive snippet
Scales down on narrow screens while capping at a comfortable width.
<div style="max-width:440px;margin:0 auto;">
<iframe
src="https://romannumerals.app/widget"
title="Roman numeral converter by Numerus"
width="100%"
height="200"
loading="lazy"
style="border:0;"
></iframe>
</div>Frequently asked questions
How do I embed the Roman numeral converter?
Copy the iframe snippet on this page and paste it into your site's HTML where you want the converter to appear. It works on any platform that allows an iframe.
Is the embed free?
Yes. The widget is free to embed. It shows a small Powered by Numerus credit that links back, which is what keeps it free.
Will it slow my page down?
No. The widget is a tiny self-contained page with no framework, loaded lazily, so it has almost no effect on your page speed.
Prefer raw data?
If you would rather pull numerals into your own interface, use the free JSON API instead.