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Free tool widgets for your website

Add our calculators and converters to your site, blog, or documentation for free. No sign-up or API key is needed. Each mobile-friendly widget runs in your visitor's browser and loads from a fast global CDN.

How to embed a tool in 3 steps

  1. Open a tool from the list below.
  2. Find the “Embed this tool on your site” section and copy the one-line code.
  3. 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.

Popular tools to embed

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

Browse all HIFreeTools tools →

Add tools to WordPress or Chrome

Two free, open-source add-ons use the same embeds, with no account or API key.

WordPress plugin

Adds a [hifreetool] shortcode and a block. Enter the tool slug to render a responsive widget with attribution.

Download plugin (.zip)

Chrome extension

A toolbar launcher for searching all 300+ tools and opening any tool in one click. Load it from chrome://extensions using Load unpacked.

Download extension (.zip)

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; visitor data stays in the browser.

Frequently asked questions

Are the widgets really free to embed?

Yes. Every tool can be embedded free with no sign-up or API key. It runs in the visitor's browser, so you pay no hosting cost.

How do I add a tool to my website?

Open a tool, find the embed section, copy the one-line iframe code, and paste it into your page's HTML.

Will the widget slow down my page?

It loads lazily as lightweight static code from a global CDN and does not block your page from rendering.

Can I style or resize the widget?

Yes. It fits its container at 100% width, and you can change the iframe height.

Is attribution required?

The code includes a small credit link. Keeping it is appreciated, but the widget works without it.

Is there a WordPress plugin?

Yes. Install the free plugin and use its shortcode or block to render the same responsive widget.

Is there a browser extension?

Yes. The Chrome extension lets you search all tools and open one in a click.