Rampart: 14.7MB browser-native PII redactor hits 98.4% recall

Rampart: Browser native on-device PII radaction

Rampart is an open-source, on-device PII filtering system that runs entirely in the browser. It combines deterministic regex validations for structured data (SSNs, credit cards, phone numbers) with a 14.7MB MiniLM model that catches names and street addresses in context. Trained on OpenPII 1.5M, it achieves 98.4% private-term recall across seven languages with 3.9ms median latency on WebGPU, outperforming Microsoft Presidio and AWS Bedrock Guardrails.