“40 × 30 × 25 cm” is hard to picture. ThisBig draws it next to things people know where they live: a hand, a bank card, a carry-on case, a gas cylinder. It says how it’s carried, whether it goes through a doorway, and, when the shopper has the ThisBig app or browser extension, whether it fits their own space or their car boot.

WooCommerce: the size comes from each product’s length, width and height, in your store’s unit. Nothing to type. Each variation’s own size shows as it’s picked.
Sizes your products already give: “Look for sizes” finds products with no length, width or height whose description or attributes say their size, like “Dimensions: 82 x 50 x 104 cm”. You tick the ones to fill in.
Kinds of thing, found for you: a sofa is drawn next to different things than a kettle. ThisBig works out what each product is from its name and categories, with nothing to set. A product can pick its own if ThisBig gets it wrong.
In your theme: between the price and add to cart in classic and block themes, wherever you put the ThisBig size block in a block theme’s product template, and under the price by script in a theme that has neither. It holds its place from the first paint, so nothing on the page moves.
Any WordPress site: add the ThisBig size block, or the shortcode [thisbig size="40 x 30 x 25 cm" category="cooler"].
Small and fast: a chip under 25 KB, loaded only on pages that show a size, no cookies on your pages, and nothing more loads until a shopper taps it.
Free for 1,000 sized views a month. A sized view is a page view where the size showed. On Free, the drawing a shopper opens says “Sized by ThisBig”, with a link to ThisBig. Starter and Growth add more views, shoe sizes from your own chart and catalogue sync.

Connect from ThisBig in the WordPress admin menu. You sign in to ThisBig or add your shop there, and come back connected. You never paste a key.

External services

This plugin connects to ThisBig (thisbig.app), the service that draws the sizes. It is needed for the plugin to do anything.

On your product pages, shoppers’ browsers load the ThisBig loader and chip from embed.thisbig.app. When a shopper taps the chip, the drawing loads in a frame from embed.thisbig.app. Once per page view, the browser sends ThisBig a count: the page’s path (without its query string), the product’s SKU, and whether the size showed, was opened or shared, and whether the shopper’s own sizes showed. When a product has no size on the page, the browser asks ThisBig for it by SKU. No cookie is set on your site, and the count says nothing about who the shopper is.
When a shopper uses ThisBig themselves, the drawing can show their own sizes: their space, their car boot, their feet. They come from the ThisBig browser extension in the shopper’s browser, or from the ThisBig app once the shopper links it to their browser with a code. A linked browser keeps a cookie on embed.thisbig.app, inside the drawing’s frame, so ThisBig knows whose sizes to show. The sizes stay in that frame: your site and its scripts never see them.
When you connect, your site’s address is sent to ThisBig, and the plugin receives a site key and a secret key, kept in your WordPress options.
On ThisBig’s page in the admin, the plugin asks ThisBig whether your site is live, how many sized views it has used and what each plan costs.
To find what kind of thing each product is, once you’ve connected and whenever a product’s name or categories change, its name and category names are sent to ThisBig, in the background.
When you choose Look for sizes, the name, attributes, short and long description and category names of up to 250 products with no length, width or height are sent to ThisBig to be read for a size. ThisBig keeps none of them.
When you sync your catalogue (Starter and Growth), each product’s SKU, address, name, size and kind of thing are sent to ThisBig.

ThisBig’s terms: https://thisbig.app/terms
ThisBig’s privacy policy: https://thisbig.app/privacy

ThisBig: product size comparison

External services