Show HN: Sign Any PDF Free – No account, no watermarks, no limits

I got tired of paying $15-50/month to sign PDFs, so I built a free alternative.

How it works: Upload PDF, draw or type your signature, place it, download. Done.

No account required. No document limits. No watermarks. No "you've used your 3 free signatures" gotchas.

Monetized through ads (same model as Photopea).

Tech: Node.js + Express, pdf-lib for manipulation, vanilla JS frontend. Processing happens client-side for privacy.

Happy to answer questions about the implementation or business model.