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This is an exceptionally lazy modification of PaintBBS NEO for use on [R18] Paperchan via the insert data URL to canvas userscript.
To use the userscript and post images made on theis page to Paperchan, you will need a userscript manager, like Violentmonkey or Tampermonkey. Copy in the script into your userscript manager and enjoy.
Draw your beautiful picture, click Send, and you can copy the image URL into Paperchan if you have the userscript installed. You can only click Send once.
Take note that Paperchan only supports 8 colors (3-bit RGB), all of which are in the default palette (so don't change it lmao). Colors outside this range will be clamped and will look ugly. This also means that transparency, the Blur tool, the WaterColor tool, and the Light/Dark tools will not work like you want when you post your image to Paperchan. You can use the Solid, Text, and Halftone tools with no issues.
After clicking "send", your finished picture will appear here. Copy the image's URL to get a data URL to use with the Paperchan data URL script. You can also save the PCH file to save a replay of your drawing steps, or simply save the image you painted directly as a PNG.