How to Create a Custom 404 Error Page in Squarespace
A 404 error page is what a visitor sees when they click a broken link, typo a URL, or try to access a page that no longer exists on your website.
By default, Squarespace displays a generic, unhelpful system message. If a visitor lands on it, they will most likely click away from your site entirely.
Turning this dead end into a beautifully designed, custom 404 page is a simple way to keep people engaged, show off a bit of your brand’s personality, and quietly guide them back to your actual content. Here is how to build and assign one in Squarespace without touching a single line of code.
Step 1: Design your new 404 layout
Before you can tell Squarespace to use a custom error page, you need to build the page layout itself.
Log into your Squarespace dashboard and go to Website (or Pages).
Scroll down to the Not Linked section and click the + (Plus) icon.
Select Blank Page.
Name the page something clear for your own internal reference, like 404 Page or Page Not Found.
What to put on a clean 404 page:
Because this page is a detour, keep the layout highly minimal and easy to digest:
A friendly, direct headline: Use something honest like "Oops, we can’t find that page" or a simple "404: Lost in space."
A brief explanation: One short sentence letting them know the page might have moved or been deleted.
Clear navigation links: Give them an immediate way out. Add a few text links or buttons pointing back to your Homepage, your Portfolio, or your Contact page.
A Search Bar: Adding a native Squarespace Search block is an excellent way to let users instantly look for what they originally wanted.
Step 2: How to change the default 404 page in Squarespace
Once your new page looks exactly how you want it, you need to set it as your site's official error destination.
From your main backend menu, click on Settings (on newer Squarespace interfaces, you may need to go to Website > Website Tools > System Pages).
Look for 404 Page (or Error Page).
Click the dropdown menu, which currently says System Default.
Select the new 404 Page you just built from the list.
Click Save in the top left corner.
Simple design tips for an intentional 404 page
Keep your header and footer visible: Do not hide your main website navigation on your 404 page. If a user gets lost, your primary menu bar is their easiest escape route.
Check the mobile grid: Just like your portfolio sections, open the Fluid Engine mobile preview to ensure your text and buttons align beautifully on smaller smartphone screens.
Test it yourself: To make sure it is working perfectly, go to your live website, type something completely random at the end of your URL (like yourdomain.com/abcxyz), and press enter. Your brand-new custom layout should instantly appear.