Live at https://pdfdraw.isaach.uk/
This tool is a slightly modified version of https://tldraw.dev/examples/pdf-editor, and therefore uses TLDraw's SDK and all dependencies of that.
I also use a polyfill from https://gist.github.com/lmammino/ef121da874a80d657379a1cd64bf8166 to resolve an issue with compatibility with older browsers.