Open Source Ecosystem

The Standard for
404 Experiences

Beautifully crafted, open-source error pages built by the developer community. Perfect your app's dead ends with our GitHub organisation repositories.

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Independent Repositories. Drop Into Any Stack.

Built for modern stacks

Everything you need to create the perfect fallback experience, tailored for developers and UI/UX designers.

Zero Dependencies

Copy and paste raw HTML and CSS. No massive libraries, no bloat. Just clean, optimized code that renders instantly when your users hit a dead end.

Glassmorphism & UI

Designs that leverage modern CSS features like backdrop-filter, fluid typography, and dynamic theme switching.

Single Page Repositories

Every specific 404 design gets its own dedicated repository. Zero bloat. Just clone the exact page you need and nothing else.

MIT Licensed

Fully open source. Use them in personal projects, commercial client work, or enterprise applications without worrying about complex legalities.

Explore Design Categories

Our GitHub organisation categorizes 404 pages by aesthetic and technical implementation.

Minimal

Clean typography and whitespace.

Terminal

Developer-focused console UIs.

Glassmorphism

Frosted glass and gradients.

Animated

Keyframes and SVGs in motion.
More Designs

Why 404 Pages Matter

A broken link shouldn't mean a broken relationship with your users.

Better Experience

Transform a moment of frustration into a moment of delight. A well designed error page reassures the user that the site isn't broken, just the link.

Reduced Bounce Rate

Standard browser error pages cause users to close the tab instantly. Custom pages keep them within your ecosystem.

Helpful Navigation

Guide lost users back to safety by providing strategic links to your homepage, search bar, or most popular content.

Brand Continuity

Maintain your unique voice, tone, and visual identity even when things go wrong, building trust through attention to detail.

Top Contributors

The talented developers and designers crafting the open-source ecosystem.

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Developer Testimonials

Real experiences from developers and designers using notfoundpages to build beautiful 404 experiences.

octocat
Octocat
@octocat
"These 404 pages are absolutely stunning. The glassmorphism designs work perfectly in our modern web app. Highly recommended!"
...
ghost
Ghost
@ghost
"Contributing was seamless. The repository structure and documentation made it so easy to add my own 404 design variant."
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octocat
Octocat
@octocat
"As a designer, I love how well-organized this project is. The CSS is clean and the animations are butter-smooth."
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ghost
Ghost
@ghost
"Perfect for our SaaS platform. We deployed one in production within minutes. Zero dependencies means no bloat!"
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octocat
Octocat
@octocat
"The community here is amazing. Everyone's supportive and the review process for PRs is incredibly helpful and constructive."
...

Integrates in seconds.

Browse our GitHub Organisation, find your favorite 404 page, clone its specific repository, and drop the files straight into your project's routing configuration.

Read the documentation
$ git clone https://github.com/notfoundpages/repo.git
$ cd repo
...

> Starting local environment...
✓ Ready on http://localhost:3000/

Become a Contributor

Help us build the internet's largest open-source collection of error pages. It only takes a few steps to get your PR merged.

01

Fork a Repository

Head over to the notfoundpages GitHub organisation and fork the specific page repository you want to improve, or request a new one.

02

Craft Your Page

Add your code, assets, and a detailed README explaining your UI/UX decisions to your isolated page repository.

03

Submit a PR

Open a Pull Request against our main branch. Our maintainers will review your logic, merge it, and credit your GitHub profile!

Frequently Asked Questions

Everything you need to know about using and contributing to our open-source organisation.

What licenses do these repositories use?
All of our repositories are licensed under the MIT License. This permissive open-source license allows you to use the code for personal projects, commercial client work, and enterprise software without legal friction.
Do these pages support local storage themes?
Yes! Many of our newer pages (including this very landing page) include lightweight JavaScript snippets to handle Light/Dark mode toggling via the browser's localStorage API.
Can I submit a design built with Tailwind CSS?
We love Tailwind! Since every page is its own repository, simply build your Tailwind-based 404 design and open an issue to request a new, dedicated repository for it within the organisation.
How do I get my name on the contributor list?
Once your first Pull Request is merged into any repository within our organisation, even a single accepted commit is enough to place your name in that repository's contributor list and register your contribution across the organisation. Website featured contributor sections are reserved for contributors who have reached 500+ contributions across the ecosystem. Learn more.

Ready to craft better fallbacks?

Join hundreds of developers who are making the web a slightly less frustrating place when things go wrong.

View GitHub Organisation