Here is some tools on the site.
All the tools are run in the browser, so no data is sent to the server.
Encode and Decode:

• Base64 Encode
• Base64 Decode

QRCode:

• QRCode Generator
• QRCode Reader

Stable Diffusion:

• Stable Diffusion

PDF2Pic:

• Convert PDF to Image

Password Generator:

• Password Generator

Commutative Diagram Editor:

• TikZCD Editor; Original repo:tikzcd-editor
• Typst Commutative Diagram Editor; Original repo:tikzcd-editor