How to fix mixed content on Squarespace

Steps for Squarespace

1. Squarespace hosts all its own assets over HTTPS. Mixed content comes from Code Blocks or custom CSS/JS injections.
2. Go to Pages → click the page → Edit → find any Code Block components. Click each to edit and replace 'http://' URLs with 'https://'.
3. Go to Settings → Advanced → Code Injection. Check the Header and Footer injection areas for any 'http://' src or href values and update them to 'https://'.
4. Go to Design → Custom CSS and look for any url('http://...') references — update to 'https://'.
5. Re-test using browser DevTools Console.

What is mixed content?

Mixed content happens when a webpage is served securely over HTTPS but one or more of its resources — images, JavaScript files, CSS stylesheets, fonts, videos, or iframes — are still requested over the old, unencrypted HTTP protocol. Browsers treat this as a security problem because the page itself is encrypted but parts of it are not. Modern browsers either silently upgrade, actively block, or display a security warning when they detect mixed content. The result is a broken or degraded experience for your shoppers.

Mixed content can break visible elements on your store (images that won't load, styles that don't apply, widgets that silently fail), directly hurting conversion rates. Browsers like Chrome and Firefox block "active" mixed content (scripts and stylesheets) outright, meaning functionality you depend on — checkout widgets, live chat, reviews — may simply stop working. A broken padlock icon or "Not Secure" warning in the address bar destroys shopper trust at the exact moment they are deciding whether to buy. Search engines also use HTTPS as a ranking signal, and a compromised security indicator can undermine the SEO benefit your SSL certificate is supposed to provide.

See the complete Mixed content guide for every platform and the full background.