A minimalistic interface that copies any text to the user's clipboard using URL query params
Add the text you want the user to copy in query params with the key "text" (make sure to encodeURIComponent your text before). Example:
With the official instance of the website hosted on netlify:
https://text2clipboard.netlify.app/?text=Hello%2C%20World!
With a self-hosted version:
https://<your-domain>/index.html?text=Hello%2C%20World!
There is nothing simpler than this website, I think you should understand the code pretty quickly. No overkill framework, just basic HTML, CSS and JS.
Text2Clipboard is a free and open source software licensed under the WTFPL license. Do what the fuck you want to.