Playground
Pick a preset, change anything, watch the real library render it. Then copy the snippet or download a finished 404.html. Every option is documented in the reference.
Settings
No images configured. RJLCustom404 ships none, so the bracketed text in the preview is exactly what your visitors would see. Add yours under Images, or use the demo set.
Edit here or in the form - they stay in sync
This page stores your last configuration in localStorage under rjl.codes:playground:v1. The preview frame stores the library's own shuffle queues under rjl404_rjl.codes_image and rjl404_rjl.codes_text, exactly as it would on your site. No cookies, nothing leaves your browser.