How to build scalable web apps with OpenAI's Privacy Filter

This article demonstrates building three secure web applications using OpenAI's Privacy Filter, an open-source PII detector model.

• •Privacy Filter is a 1.5B-parameter model with 128k context that detects 8 PII categories in a single forward pass
• •Document Privacy Explorer highlights detected PII spans in PDFs/DOCX files with category filters and a summary dashboard
• •Image Anonymizer uses OCR and Privacy Filter to identify and redact text in images with draggable/toggleable black bars
• •SmartRedact Paste creates a pastebin with two URLs: public (redacted with placeholders) and private (token-gated original with highlights)
• •gradio.Server architecture separates queued model calls (@server.api) from static FastAPI routes for consistent implementation