Embed the size converter
Add a free ring, shoe and hat size converter to your blog or store with one line of HTML. It runs entirely in the visitor's browser and keeps working forever.
Pick the category and direction your customers actually need. The preview and the snippet update as you choose, so what you copy is what they get.
Live preview
This is the exact widget your visitors will see.
Copy this code
Paste it where you want the converter to appear. No script tag, no dependencies, nothing to maintain.
<iframe src="https://mysizecharts.com/embed/widget.html?category=shoe&from=eu&to=usW" title="Size converter by MySizeCharts" width="420" height="380" style="border:0;max-width:100%" loading="lazy"> </iframe>
Install it on your platform
The snippet is plain HTML and works anywhere you can paste HTML. If your shop hides that behind an editor, these walk through where to paste it: Shopify, WooCommerce and Squarespace.
Resizing
The widget posts its height to the parent window as a mysizecharts:height message, so you can resize the iframe instead of guessing. Listen for it with a message handler if your layout is tight; ignore it and the fixed height still works.
Terms
The widget is free to embed, including on commercial sites. It carries a small "Sizes by MySizeCharts" link. Please keep it. It is the only thing we ask in return, and it is what pays for the charts staying free and neutral. If you would rather not show it, get in touch and we will work something out.
The widget loads no external font, no analytics and no third-party script, and it never carries an affiliate link. It runs on your domain, so anything it did would be your problem, and that is exactly why it does nothing. For raw data instead of a widget, see the free JSON API.
Last reviewed and updated on August 5, 2026. The widget is regenerated with each site build.