Enhance Your Squarespace Site with Custom Code Blocks

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Jun 25, 2025 09:35 PM

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Enhance your Squarespace site with custom code blocks to add HTML, CSS, JavaScript, or Markdown. Be aware of limitations like size, plan restrictions, and lack of support. Troubleshoot common issues by adjusting settings and testing in incognito mode.

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Squarespace

Squarespace Code Blocks: Your Guide to Adding Custom Code

Learn to enhance your Squarespace site with custom code blocks effectively.

TL;DR: Key Points

Use code blocks to add custom HTML, CSS, Markdown, or JavaScript to your site

Add code blocks to any page, blog post, or sidebar area

JavaScript and iframes work on Business plans and above

Each code block has a 400 KB size limit

Display problems can often be fixed by turning off Ajax loading or removing pages from Index layouts

Squarespace support won't help with custom code issues

What Are Code Blocks?

Code blocks let you add custom elements to your Squarespace site that go beyond the standard blocks. You can use them to embed third-party widgets, add custom styling with CSS, include JavaScript functionality, or display code snippets if you're writing technical content.

Think of them as blank canvases where you can paste HTML, CSS, JavaScript, or Markdown code.

How to Add a Code Block

Edit your page: Click Edit on the page where you want to add custom code

Add the block: Click the + icon where you want the code block to appear, then select Code from the menu

Paste your code: Drop your HTML, CSS, JavaScript, or Markdown into the text field

Choose display settings:

Turn on "Display Source" if you want to show the actual code (useful for tutorials)

Leave it off if you want the code to run normally

For CSS, wrap it in <style> tags

For JavaScript, wrap it in <script> tags

Fixing Common Problems

Your code isn't showing up Try viewing your page in an incognito window. Sometimes code blocks don't display properly when you're logged into Squarespace.

Code works elsewhere but not on your site Turn off Ajax loading in your site settings (Settings > Advanced > Performance). Ajax can interfere with custom JavaScript.

Code block won't work on an Index page Index pages (like portfolio galleries or blog summary pages) can cause issues. Try moving your page out of any Index layout and test again.

Code displays as text instead of running Make sure you haven't accidentally turned on "Display Source" in the code block settings.

Important Limitations

Plan restrictions: JavaScript and iframes only work on Business plans and higher

Size limit: Each code block can handle up to 400 KB of code (roughly 300,000 characters)

No support: Squarespace won't troubleshoot custom code issues for you

Updates can break things: Platform updates occasionally affect custom code

Quick Reference

Code Blocks: Special areas in Squarespace where you can add custom HTML, CSS, JavaScript, or Markdown

CSS: The language that controls how your website looks (colours, fonts, spacing)

HTML: The basic building blocks of web pages

JavaScript: Code that makes websites interactive (animations, pop-ups, dynamic content)

Markdown: A simple way to format text using symbols (popular with developers)

Ajax: A web technology that loads content without refreshing the page (can conflict with custom code)

Iframes: A way to embed content from other websites (like YouTube videos or Google Maps)

Final Thoughts

Code blocks give you serious flexibility to customise your Squarespace site beyond the standard options. Start small with simple HTML or CSS additions before moving on to JavaScript.

Remember that custom code means you're on your own when things go wrong. Always test your additions thoroughly, and keep backups of working code. When Squarespace updates their platform, be prepared to troubleshoot any custom code that stops working.