404 Page Generator
Guides

Custom 404 page guides

Platform-by-platform, step-by-step instructions for replacing a plain "page not found" with a 404 page that actually recovers the visitor — with code, and no fluff.

A 404 page is what a visitor sees after a broken or mistyped link. Done well, it turns a dead end into a recovery. Each guide below covers one platform: where the 404 page lives, how to customise it, and how to keep a correct HTTP 404 status. When you want to skip straight to a finished page, the generator builds an on-brand one for any site for free.

Platform guides

WordPress
Add a 404.php to a child theme, edit the block 404 template, or use a no-code plugin.
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Shopify
Customise the 404 template in the Theme Editor or in 404.liquid, with escape routes for shoppers.
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Next.js
app/not-found.tsx, pages/404.js, the notFound() function, and static-export gotchas.
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Webflow
Find and design the built-in 404 utility page — plus the export hosting caveat.
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Technical SEO

Fix soft 404 errors
Why a missing page returns HTTP 200, why it hurts SEO, and how to fix it on any platform.
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Don't want to hand-build it?

Enter any website and get a complete, on-brand 404 page tailored to its real colours, fonts, and navigation — in the right code format for its platform.

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What makes a 404 page good

Every guide here points back to the same idea: a 404 page is a design and copywriting surface, not an error message. The best ones orient the visitor, offer real escape routes, include working search, suggest what the visitor probably meant, return a correct 404 status, and carry the brand's voice. The main page breaks down all twelve traits the strongest 404 pages share.