Free tool widgets for your website

Add any of our calculators and converters to your own site, blog, or documentation — free, with no sign-up and no API key. Each widget runs in your visitor's browser, is mobile-friendly, and loads from a fast global CDN, so it costs you nothing to host.

How to embed a tool in 3 steps

Open the tool you want from the list below.
Scroll to the “Embed this tool on your site” section and copy the one-line code.
Paste it into your page's HTML where the tool should appear.

Example: paste this code

This embeds the percentage calculator. Every tool page has its own ready-made snippet like this one.

<iframe src="https://hifreetools.com/embed/percentage-calculator" title="Percentage Calculator by HIFreeTools" width="100%" height="520" style="border:1px solid #e5e5e5;border-radius:8px;max-width:680px" loading="lazy"></iframe>
<p style="font:13px/1.4 system-ui,sans-serif;margin:6px 0 0"><a href="https://hifreetools.com/calculators/percentage-calculator" target="_blank" rel="noopener">Percentage Calculator</a> by <a href="https://hifreetools.com" target="_blank" rel="noopener">HIFreeTools</a></p>

Popular tools to embed

Open a tool, then grab its embed code at the bottom of the page.

Browse all HIFreeTools tools →

Why embed our tools?

✓ Keep visitors on your page with a useful interactive tool.
✓ Zero hosting cost — it runs in the browser, not on your server.
✓ Mobile-friendly and accessible out of the box.
✓ No tracking inside the widget; your visitors' data stays in their browser.

Frequently asked questions

Are the widgets really free to embed?

Yes. Every tool can be embedded for free with no sign-up and no API key. The widget runs entirely in your visitor's browser, so it costs you nothing to host.

How do I add a tool to my website?

Open the tool's page, scroll to the “Embed this tool on your site” section, and copy the one-line iframe code. Paste it into your page's HTML where you want the tool to appear.

Will the widget slow down my page?

No. The iframe loads lazily and the tool is lightweight static code on a global CDN. It does not block your page from rendering.

Can I style or resize the widget?

Yes. The iframe uses width:100% so it fits your container, and you can adjust the height attribute. The included attribution line is a small, optional credit link.

Is attribution required?

The embed code includes a small credit link back to the tool. Keeping it is appreciated and helps others discover the tools, but the widget works either way.