Deltarune Prophecy Pane Generator is now customisable

17 Oct, 2025

Warning: The ProphGen page itself now contains Deltarune Chapter 4 spoilers!

Until today, Deltarune Prophecy Pane Generator (also known internally as "ProphGen") was only able to display the animation used on this website's homepage. I always intended to make it customisable, but after learning someone else beat me to it, I decided I'd better hurry up and publish the customisable version (until about 2 days ago, it was sitting half-complete on a development webserver).

The prophecy panes now also resize based on your browser window's size (although this is currently limited to integer factors). This is particularly useful for mobile users, but as of writing, some of the built-in prophecies still get cut off on mobile.

The downside to these changes? Since I'm now using CSS variables, users on very old devices/browsers will not be able to see the prophecy panes now. Although these same users would also likely not see crisp edges on prophecy images (and in other places on the website). Either way, keep this in mind if you wanted to add the Prophecy Pane Generator to your own website with a custom image/text, that also supports very old web browsers/devices (I'm talking browsers/OSes released around 2014-2016 or before).

Why your version?

While that other website works, it has a few problems:

• The background doesn't loop properly.
• The background's colour remains constant (in the actual game, and my Prophecy Pane Generator, the background colour slowly fades between two hues).
• The background is cut off before reaching the text (at least in Firefox, the browser I use).
• Various animation issues (the "ghost" image effect is supposed to be in sync with the background "hover" effect, for one).
• Worse performance (possibly due to the use of the Canvas API to render the prophecy - the only time ProphGen uses it is once, to render the custom text, and CSS for everything else).
• Many more small rendering inaccuracies compared to my generator.

Additionally, you can (or rather, should be able to) print any of my website's pages (including the ProphGen pages), and get something that looks half decent. Although I changed out the backgrounds for solid colours when printing ProphGen instances out.

Why not your version?

Compared to DeltaProphecy, ProphGen has:

• No ability to export prophecies to PNG or GIF. Not sure yet if/how I'm going to implement this.
• Limited customisability - although this will be improved Soon™.
• Worse custom text rendering. This will also be fixed Soon™.

Built-in presets also sometimes have their text overlap the image, due to having no way to adjust the text offset. This is yet another unimplemented feature that will be fixed Soon™.

View the Prophecy Pane Generator here.

If anyone at Codeberg is reading this: if Codeberg Pages goes down because of ProphGen, I'm sorry.