Question 1

What is RJLCustom404?

Accepted Answer

RJLCustom404 is a lightweight and dynamic 404 error page generator that allows users to customize error page content, styles, and images effortlessly. It supports randomized images, dynamic text, button options, and easy integration into any website.

Question 2

How do I install RJLCustom404?

Accepted Answer

Download the JavaScript file from GitHub and add it to your HTML file before the closing head tag. Then initialize it with your custom options using the RJLCustom404() function.

Question 3

Is RJLCustom404 free to use?

Accepted Answer

Yes, RJLCustom404 is completely free to use. You can download it from GitHub and integrate it into your website without any cost.

Question 4

Can I customize the appearance of the 404 page?

Accepted Answer

Absolutely! RJLCustom404 offers 25 customization options including background colors, font colors, custom images, pattern-based image configuration, button styles, border radius, shadows, auto-generated text, and more. You can preview your customizations live on this page before implementing them.

Question 5

What browsers does RJLCustom404 support?

Accepted Answer

RJLCustom404 is built with vanilla JavaScript and works on all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. It requires no dependencies or frameworks.

Question 6

How do I preview my customizations?

Accepted Answer

Use the live configurator on this page. Edit the JSON options in the text area under Make Your Customizations and click Preview Your 404 Page to see a live preview. Your settings are saved in your browser for 10 minutes so you can experiment freely.

Question 7

Can I use my own custom images?

Accepted Answer

Yes - and you must. RJLCustom404 ships no images of its own, so every image is served from your site. Use the imgFileNames option to list your own image paths, or imgPattern with imgCount to generate them from a naming pattern. The script randomly cycles through all images before repeating. If you set no images, or a file can't be loaded, a bracketed [[ ... ]] text placeholder is shown in place of the image.

Question 8

How do I configure images using a pattern?

Accepted Answer

Instead of listing every image path individually, use imgPattern with a {n} placeholder and imgCount to auto-generate paths. For example, imgPattern: "/errors/404-{n}.png" with imgCount: 20 generates paths from 404-1.png through 404-20.png. Use {nn} for zero-padded numbers (01, 02) or {nnn} for 3-digit padding (001, 002). Set imgStartIndex: 0 for 0-based numbering.

Question 9

Does RJLCustom404 work on mobile devices?

Accepted Answer

Yes. With imgResponsiveBreakpoints enabled (the default), the layout automatically adapts for mobile screens at 768px and 480px breakpoints, adjusting image sizes, button padding, and font sizes for an optimal experience on any device.

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