Free converter widgets for your website

Add a fast, private unit converter to your blog, shop or school page. Copy the code below — it is free, needs no sign-up and shows no ads.

🔒 Private: runs in your browser, no upload

How to add a widget

Find the converter you want below and check the live preview.
Click “Copy code” (or select the code box and copy it).
Paste the code into your page’s HTML, for example in a WordPress “Custom HTML” block.

Temperature

Celsius to Fahrenheit

Embed code for Celsius to Fahrenheit

<iframe src="https://convertkind.com/embed/celsius-to-fahrenheit/" title="Celsius to Fahrenheit" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/celsius-to-fahrenheit/">Celsius to Fahrenheit converter</a> by ConvertKind</p>

Fahrenheit to Celsius

Embed code for Fahrenheit to Celsius

<iframe src="https://convertkind.com/embed/fahrenheit-to-celsius/" title="Fahrenheit to Celsius" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/fahrenheit-to-celsius/">Fahrenheit to Celsius converter</a> by ConvertKind</p>

Weight

KG to LBS

Embed code for KG to LBS

<iframe src="https://convertkind.com/embed/kg-to-lbs/" title="KG to LBS" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/kg-to-lbs/">KG to LBS converter</a> by ConvertKind</p>

LBS to KG

Embed code for LBS to KG

<iframe src="https://convertkind.com/embed/lbs-to-kg/" title="LBS to KG" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/lbs-to-kg/">LBS to KG converter</a> by ConvertKind</p>

Ounces to Grams

Embed code for Ounces to Grams

<iframe src="https://convertkind.com/embed/oz-to-grams/" title="Ounces to Grams" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/oz-to-grams/">Ounces to Grams converter</a> by ConvertKind</p>

Grams to Ounces

Embed code for Grams to Ounces

<iframe src="https://convertkind.com/embed/grams-to-oz/" title="Grams to Ounces" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/grams-to-oz/">Grams to Ounces converter</a> by ConvertKind</p>

Length & height

CM to Inches

Embed code for CM to Inches

<iframe src="https://convertkind.com/embed/cm-to-inches/" title="CM to Inches" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/cm-to-inches/">CM to Inches converter</a> by ConvertKind</p>

Inches to CM

Embed code for Inches to CM

<iframe src="https://convertkind.com/embed/inches-to-cm/" title="Inches to CM" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/inches-to-cm/">Inches to CM converter</a> by ConvertKind</p>

CM to Feet

Embed code for CM to Feet

<iframe src="https://convertkind.com/embed/cm-to-feet/" title="CM to Feet" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/cm-to-feet/">CM to Feet converter</a> by ConvertKind</p>

Feet to CM

Embed code for Feet to CM

<iframe src="https://convertkind.com/embed/feet-to-cm/" title="Feet to CM" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/feet-to-cm/">Feet to CM converter</a> by ConvertKind</p>

MM to Inches

Embed code for MM to Inches

<iframe src="https://convertkind.com/embed/mm-to-inches/" title="MM to Inches" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/mm-to-inches/">MM to Inches converter</a> by ConvertKind</p>

Feet to Meters

Embed code for Feet to Meters

<iframe src="https://convertkind.com/embed/feet-to-meters/" title="Feet to Meters" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/feet-to-meters/">Feet to Meters converter</a> by ConvertKind</p>

Meters to Feet

Embed code for Meters to Feet

<iframe src="https://convertkind.com/embed/meters-to-feet/" title="Meters to Feet" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/meters-to-feet/">Meters to Feet converter</a> by ConvertKind</p>

Distance & speed

KM to Miles

Embed code for KM to Miles

<iframe src="https://convertkind.com/embed/km-to-miles/" title="KM to Miles" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/km-to-miles/">KM to Miles converter</a> by ConvertKind</p>

Miles to KM

Embed code for Miles to KM

<iframe src="https://convertkind.com/embed/miles-to-km/" title="Miles to KM" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/miles-to-km/">Miles to KM converter</a> by ConvertKind</p>

MPH to KM/H

Embed code for MPH to KM/H

<iframe src="https://convertkind.com/embed/mph-to-kmh/" title="MPH to KM/H" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/mph-to-kmh/">MPH to KM/H converter</a> by ConvertKind</p>

KM/H to MPH

Embed code for KM/H to MPH

<iframe src="https://convertkind.com/embed/kmh-to-mph/" title="KM/H to MPH" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/kmh-to-mph/">KM/H to MPH converter</a> by ConvertKind</p>

Volume

Liters to Gallons

Embed code for Liters to Gallons

<iframe src="https://convertkind.com/embed/liters-to-gallons/" title="Liters to Gallons" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/liters-to-gallons/">Liters to Gallons converter</a> by ConvertKind</p>

Gallons to Liters

Embed code for Gallons to Liters

<iframe src="https://convertkind.com/embed/gallons-to-liters/" title="Gallons to Liters" width="100%" height="200" style="max-width:420px;border:0" loading="lazy"></iframe>
<p><a href="https://convertkind.com/gallons-to-liters/">Gallons to Liters converter</a> by ConvertKind</p>

Frequently asked questions

Are the widgets free?

Yes. They are free for personal and commercial websites, with no account, ads or usage limits.

Do the widgets set cookies or track visitors?

No. Each widget is a tiny static page with a few lines of JavaScript. The conversion happens in the visitor’s browser; ConvertKind sets no cookies.

Can I change the size?

Yes. The width adapts to its container (up to 420 px by default — change max-width in the code). Keep the height at 200 px so nothing is cut off.

Do I have to keep the link below the widget?

The widget works without it, but keeping the short text link is appreciated: it credits ConvertKind and helps your visitors find the full converter with a formula and chart.

Will the widget slow down my page?

No. Each widget is under 4 KB and uses loading="lazy", so it only loads when it scrolls into view.