Error Page Builder Pro

Design and export gorgeous, standalone error pages — 404, 403, 500, 503, maintenance, and fully custom — with a live preview and one-click HTML export.

Stop shipping ugly default error screens. Craft a polished, on-brand 404 or 500 page in seconds, then download a single self-contained HTML file you can drop onto any host. No build step, no dependencies, no network calls.

Overview

Error Page Builder Pro is a zero-dependency, single-page web app. The left side is a live editor; the right side is a browser-frame preview that re-renders as you type. When you're happy, export a complete standalone HTML file (CSS and JS inlined) named after the error type — ready for GitHub Pages, Netlify, Vercel, nginx, or Apache.

Everything runs locally in your browser. It works equally well opened straight from disk (file://) or hosted on GitHub Pages. Your work autosaves to localStorage, so a refresh never loses your design.

Features

• Six presets — 404, 403, 500, 503, Maintenance, and Custom, each with sensible default copy.
• Live browser-frame preview — debounced <iframe srcdoc> re-render with a realistic browser chrome and editable URL hint.
• Four illustration styles — animated orbiting SVG glyph, big gradient number, emoji, or a glitch text effect on the error code.
• Four background styles — gradient, mesh, solid, and an animated canvas starfield.
• Full color control — accent color plus two background colors, with a dark/light page toggle.
• Buttons & links — primary call-to-action with label + URL, an optional secondary link, and an optional decorative search box.
• Standalone export — one file, all CSS and animations inlined, no external assets or fonts. Downloads named per type (e.g. 404.html, maintenance.html).
• Copy to clipboard — grab the full HTML without leaving the page.
• Load example & reset — a fleshed-out demo state, plus a confirmed reset to defaults.
• Deploy tips — an in-app cheat sheet for GitHub Pages, Netlify, Vercel, nginx, and Apache.
• Polished UX — glassmorphism, gradient brand accent, dark/light themes, entrance animations, mobile Edit/Preview toggle, keyboard shortcuts, and accessible, semantic markup.

Installation

No dependencies and no build step.

git clone https://github.com/kasapdev/error-page-pro.git
cd error-page-pro
# then simply open index.html in your browser

Or just double-click index.html. It runs directly from file://.

Hosted version: https://kasapdev.github.io/error-page-pro/

Usage

1. Pick an error type from the preset selector (or a quick-preset button).
2. Edit the code, title, message, buttons, and footer in the left editor.
3. Choose an illustration style and background style, then tune the accent and background colors.
4. Toggle the optional secondary link and decorative search box if you want them.
5. Watch the live preview update on the right.
6. Click Export to download a standalone *.html file, or Copy HTML to grab it.
7. Drop the file onto your host — see the in-app Deploy tips for platform-specific steps.

Keyboard Shortcuts

Action	Shortcut
Export standalone HTML	Ctrl/Cmd + E
Copy HTML to clipboard	Ctrl/Cmd + Shift + C
Show keyboard shortcuts	?

Screenshots

Screenshots coming soon.

Roadmap

• Additional preset library (401, 410, 418, rate-limited)
• Auto-redirect countdown option for maintenance pages
• Import/export design as a shareable JSON snippet
• Custom logo upload (inlined as a data URI)
• One-click bundle export of multiple error pages at once

License

MIT © Error Page Builder Pro contributors. See LICENSE for details.