Show HN: PasteGuard – Self-hosted privacy proxy for LLMs

(github.com)

2 points | by sgasser 8 hours ago

1 comments

sgasser 8 hours ago
Using LLM APIs but worried about sending client data? Built a proxy for that.
OpenAI-compatible proxy that masks personal data and secrets before sending to your provider.
Mask Mode (default):
```
  You send:      "Email sarah.chen@hospital.org about meeting Dr. Miller"
  LLM receives:  "Email <EMAIL_1> about meeting <PERSON_1>"
  You get back:  Original names restored in response
```
Route Mode (if you run a local LLM):
```
  Requests with PII  →  Local LLM
  Everything else    →  Cloud
```
What it catches:
```
  PII: Names, emails, phones, credit cards, IBANs, IPs, locations (24 languages)
  Secrets: Private keys, API keys (OpenAI, AWS, GitHub), JWT tokens
```
Uses Microsoft Presidio for PII detection. ~500MB RAM, 10-50ms per request.
Works with Cursor, Open WebUI, LangChain, or any OpenAI-compatible client.
Docs: https://pasteguard.com/docs
Feedback on edge cases welcome.