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.
Popular tools to embed
Open a tool, then grab its embed code at the bottom of the page.
- Percentage CalculatorGet embed code →
- Word CounterGet embed code →
- KG to LBS ConverterGet embed code →
- BMI CalculatorGet embed code →
- JSON Formatter & ValidatorGet embed code →
- Password GeneratorGet embed code →
- Compound Interest CalculatorGet embed code →
- Age CalculatorGet embed code →
- Celsius to Fahrenheit ConverterGet embed code →
- QR Code GeneratorGet embed code →
- Random Number GeneratorGet embed code →
- Loan Payment CalculatorGet embed code →
Add tools to WordPress or Chrome
Two free, open-source add-ons that wrap the same embeds — no account and no API key.
WordPress plugin
Adds a [hifreetool] shortcode and a block — just type the tool slug. Renders the responsive embed with an attribution link.
Chrome extension
A toolbar launcher to search all 300+ tools and open any of them in one click. Load it via chrome://extensions → Load unpacked.
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.
Is there a WordPress plugin?
Yes. Download the free HIFreeTools Embed plugin below, install it, then add the [hifreetool slug="..."] shortcode or the HIFreeTools Embed block. It renders the same responsive widget with attribution.
Is there a browser extension?
Yes. The Chrome extension is a toolbar launcher that lets you search all of our tools and open any of them in one click. Download the zip below and load it via chrome://extensions → Load unpacked.