Using protocol-independent URLs

Different web protocols might cause your store to behave unexpectedly for some users.

Colors don't display correctly
Some page elements or images don't appear
Your browser address bar shows a warning:

This might happen if some of your theme assets don't use protocol-independent URLs. These URLs are required if you want to load your site through a secure connection (https://).

About assets

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Assets are files that your theme needs to function properly. These include JavaScript files, stylesheets, and image files. External hyperlinks are not considered assets.

Protocol-independent URLs

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URL protocols look like http://, https://, and ftp://. A protocol-independent URL simply begins with //.

You might be loading your store through a secured connection (https) if any of the following apply to you:

you use the .myshopify.com address as your primary domain
you're a Shopify Plus merchant with custom SSL security on your store
you've activated SSL for your online store.

For your store to load properly, all theme assets must use your store's secure protocol. You can make sure this by replacing the http:// in their reference addresses with //.

Updating assets to use protocol-independent URLs

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To make sure your assets work properly when your store is viewed through a secure connection, search your theme files for the text http://, and replace all instances of that text with //. For example:

Before:

After:

Best practices

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You can download your theme and use the Replace all feature in a text editor to replace the URL protocol in all your theme files. You can then upload your edited theme, and publish the imported theme that has protocol-independent URLs.
To find out which assets are not loading securely, you can check your browser console. The console should list the assets that are not loading properly.