Numerus

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>

Snippet with a visible credit

The same responsive embed with a normal link underneath it, in your page rather than in the frame. Use this one if you are happy to credit the tool. Reword the sentence however you like; there is no required wording and no required placement.

<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> <p style="font-size:13px;margin:6px 0 0;"> <a href="https://romannumerals.app/">Roman numeral converter</a> by Numerus </p> </div>
About the credit, honestly. The widget itself carries a small Powered by Numerus line, but that link sits inside the frame, on a page that is deliberately noindex, so it is a link from Numerus to Numerus and it does nothing for us. Only the third snippet above puts a real link in your page. None of the three is required: embed whichever suits you and the tool stays free either way.

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, free, with no account and no limit. A credit is appreciated but not required. If you want to give one, use the credited snippet on this page: it puts a normal link in your own page, which is the only version a search engine can actually see.

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.