Rather than simply base64 encoding the text, you could try compressing it first with Gzip with CompressionStream, then you should be able to handle longer code. For example this URL showing the code I'm using: https://glyphide.com/?c=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 Would compress down to: https://glyphide.com/c?=H4sIAAAAAAAACqVWTW_bMAy951dwh8F209r7aIsCaYal2VYM2ICiH5d1RaHYdCzMkQxJaZYW_e-DJDuWHDc9LAcjsUi-R4p8TLK3N4A9mPJFJVBKlEBAKkHZHJZSP1WBwIiiD7gxopzBlRJIFhImF98hPP9FqwgIy0DHUgUyQJbyDCVQBZQpDgRuLn8cSJIjnBGJx4eQc7EgKtYenysiyAKeLPAzUFYt1ZVlcV1gQ0hxqARPUUrrJVAtBZPwdCH4gko8tXafnmGiDfUrUAVRIFDy8gElrKgqTEZdMpZuBmlTh6wG1UjJgMg1SyFfslTp5BurCcu-GsfQYRzB0wAAgOYQvvHeW74QBCNjYB5JAu9jmAokCm3pkSwgF3xheBr_lgoApJxJ1diNgeEKzko-C28dqLsotgZhNBo0MB8cmPNHWm2y0BnV8fQVVrRCH1ufqELw5bwAqlwabbmuGkLWPtZRrq1PqDk6vWNNw2D-SKsgchh-jOESSWbA_YvQoW0bMZgIQdZnyzxH0U_lEmXFmcS6Os3PsEs2GvW6O_FhDGRFaF_wmLRmbpUPY5hy9oBCuUQDCbO1QglmEmaUEbFuujrnAmaKkzDqT-fMONpcbihTJyZu2EvYS8nC1GM0Bvsl1q01LYiY8gxjUlXlOmTLstzvIjo5HcX-mJgL8pJwmc-M6QbWpOZScQIfx_CT_LHxaoS6KM18uoGXorwiOdaGYw_ImOlPLLAqSYph8nuYzPchOAiivsPEHN73Ho7NWRA5Y1qPrkdhNHgeDBKrn1_Qyt22zNUJ6cnKMG1llqptgW0i7ZLZXsH0S3O9Q-BaVfsv_eSCzikj5b6b1E7NzEyFJixrEww92o1ubrSzc-qop6uc9bB1852R9I-dNqkIy4jI_AuxjVXiVr96qG1PHJieGAZR--revEqaPlkVtEQI3XBxiWyuCngLXnYe4nAMwbjeCM-uWNuW6pmNbQ2JX556ovjM4-TrbVO-rYm2KK3euBAlMj1-DlCdqKc-_bJVIqvrpXUv1BdAYQzvRkDhVEceAR0OvWrpQLf0rguZ1iI2USGNuvU73LFTnX41sV_Zq8amd6MedTdqhrt3at8KdefntSXqacPWGnX_Uxw7q7Q7oQ0pO5FaiIgRrutvByc9DeW6v7Rat5PwNlHnuO5Ms1n7oscK_6pNoeu5346h9fcfZqDKGr8KAAA Going from 3668 to 1203 characters (although there is some overhead, so really short strings end up longer). More on reddit.com

The syntax highlighting theme is terrible. The text is far too low contrast to read comfortably. The title bar is unreadable. Dark text on a dark background doesn't work. Are you by any chance getting the theme from the system's preferred light mode/dark mode setting, and combining that with other colours specifically intended for dark mode? Edit: Here's a screenshot of how it looks for me. I got the same result on Firefox and Chrome. https://imgur.com/SPcZwkl More on reddit.com

You can paste that SQL into here https://supabase.com/docs/guides/api/sql-to-rest More on reddit.com

those are the two good ones - you can even just write code in a .js file and open it with the browser and it will display the results of a function or whatever you write. That's how I used to test simple functions.

More on reddit.com