Free Embeddable Converter Widgets for Your Website

Add professional unit converter widgets to your blog, website, or app — free forever, no signup needed. Pick a widget, copy the embed code, and paste it into your HTML. Each widget is self-contained, mobile-friendly, and supports dark mode.

Choose a Widget

🌡️ Temperature Converter

Convert °C, °F, and Kelvin. Perfect for recipe blogs and travel sites.

Embed Code:

<iframe src="https://www.coolconversion.com/widget/temperature/" width="320" height="250" frameborder="0" title="Temperature Converter - CoolConversion.com"></iframe>
<p style="font:12px/1.4 sans-serif;text-align:center;margin:6px 0">Powered by <a href="https://coolconversion.com/temperature/">Temperature Converter</a> at CoolConversion</p>

🍳 Cooking Converter

Cups, tablespoons, mL, oz, grams. Built for food blogs and recipe sites.

Embed Code:

<iframe src="https://www.coolconversion.com/widget/cooking/" width="340" height="320" frameborder="0" title="Cooking Converter - CoolConversion.com"></iframe>
<p style="font:12px/1.4 sans-serif;text-align:center;margin:6px 0">Powered by <a href="https://coolconversion.com/cooking/">Cooking Converter</a> at CoolConversion</p>

📏 Length Converter

cm, inches, feet, meters, km, miles. Universal length converter.

Embed Code:

<iframe src="https://www.coolconversion.com/widget/length/" width="340" height="320" frameborder="0" title="Length Converter - CoolConversion.com"></iframe>
<p style="font:12px/1.4 sans-serif;text-align:center;margin:6px 0">Powered by <a href="https://coolconversion.com/length/">Length Converter</a> at CoolConversion</p>

⚖️ Weight Converter

kg, lbs, grams, ounces, stones. For fitness and health blogs.

Embed Code:

<iframe src="https://www.coolconversion.com/widget/weight/" width="340" height="320" frameborder="0" title="Weight Converter - CoolConversion.com"></iframe>
<p style="font:12px/1.4 sans-serif;text-align:center;margin:6px 0">Powered by <a href="https://coolconversion.com/weight/">Weight Converter</a> at CoolConversion</p>

💪 BMI Calculator

Height + weight = BMI with category. For health and fitness sites.

Embed Code:

<iframe src="https://www.coolconversion.com/widget/bmi/" width="340" height="320" frameborder="0" title="BMI Calculator - CoolConversion.com"></iframe>
<p style="font:12px/1.4 sans-serif;text-align:center;margin:6px 0">Powered by <a href="https://coolconversion.com/health/bmi-metric/">BMI Calculator</a> at CoolConversion</p>

📶 Download Time Calculator

File size + speed = download time. For tech blogs and ISP reviews.

Embed Code:

<iframe src="https://www.coolconversion.com/widget/download/" width="340" height="320" frameborder="0" title="Download Time Calculator - CoolConversion.com"></iframe>
<p style="font:12px/1.4 sans-serif;text-align:center;margin:6px 0">Powered by <a href="https://coolconversion.com/data-rate/download-time-calculator/">Download Time Calculator</a> at CoolConversion</p>

🏎️ Speed Converter

km/h, mph, knots, m/s. For travel and automotive sites.

Embed Code:

<iframe src="https://www.coolconversion.com/widget/speed/" width="340" height="320" frameborder="0" title="Speed Converter - CoolConversion.com"></iframe>
<p style="font:12px/1.4 sans-serif;text-align:center;margin:6px 0">Powered by <a href="https://coolconversion.com/speed/">Speed Converter</a> at CoolConversion</p>

🧪 Volume Converter

Liters, gallons, cups, mL, fl oz. For science and cooking.

Embed Code:

<iframe src="https://www.coolconversion.com/widget/volume/" width="340" height="320" frameborder="0" title="Volume Converter - CoolConversion.com"></iframe>
<p style="font:12px/1.4 sans-serif;text-align:center;margin:6px 0">Powered by <a href="https://coolconversion.com/volume/">Volume Converter</a> at CoolConversion</p>

JavaScript Embed (Alternative)

For a lighter embed without iframes, use our JS loader:

<div id="cc-converter" data-category="temperature" data-theme="light"></div>
<script src="https://www.coolconversion.com/widget/embed.min.js" async></script>
<p style="font:12px/1.4 sans-serif;text-align:center;margin:6px 0">Powered by <a href="https://coolconversion.com/temperature/">Temperature Converter</a> at CoolConversion</p>

Change data-category to: temperature, length, weight, volume, speed, cooking, bmi, or download. Add data-theme="dark" or data-theme="light" to force a theme; omit it to follow the visitor's system.

Why Use Our Widgets?

Free Forever

No signup, no API key, no usage limits. Just copy the embed code and paste it into your HTML.

Mobile-Friendly

Responsive design works from 240px to any width. Light & dark themes — auto-detected, or forced with ?theme=light / ?theme=dark.

Fast & Light

Under 4KB total (CSS + JS). No jQuery, no frameworks, no cookies, no tracking.