Local PII Pre-Filter with Microsoft Presidio + Qwen 2.5

Place a small, local PII pre-filter in front of any LLM by combining deterministic, explainable detection from Microsoft Presidio (GitHub, docs) with a tiny CPU SLM such as Qwen 2.5 to catch fuzzy or implicit PII—packaged in containers to run on laptops or servers with no GPU. This pre-ingest/pre-prompt guard blocks, redacts, or annotates content before the LLM sees it, emitting auditable spans, types, and confidences to reduce exfiltration risk and deliver compliance-by-construction. It fits as a pre-ingest, pre-prompt, or guardrail-loop step, forwarding only clean text to downstream copilots/LLMs. Live demo: pii-checker.com.