Local Privacy Firewall-blocks PII and secrets before ChatGPT sees them
OP here. I built this because I recently caught myself almost pasting a block of logs containing AWS keys into Claude. The Problem: I need the reasoning capabilities of cloud models (GPT/Claude/Gemini), but I can't trust myself not to accidentally leak PII or secrets. The Solution: A Chrome extension that acts as a local middleware. It intercepts the prompt and runs a local BERT model (via a Python FastAPI backend) to scrub names, emails, and keys before the request leaves the browser. A few notes up front (to set expectations clearly): Everything runs 100% locally. Regex detection…
Local Privacy Firewall-blocks PII and secrets before ChatGPT sees them launched on December 9, 2025 with 111 votes, #276 of 11,628 launches that month and more than 95% of that year's launches.
In plain words
Local Privacy Firewall is a Chrome extension that prevents accidental leaks of sensitive data when using AI models like ChatGPT, Claude, and Gemini. It intercepts prompts before they're sent and uses local processing—including a BERT model running on the user's machine—to detect and remove personally identifiable information, email addresses, and secrets such as API keys. All detection and scrubbing happens locally in the browser or via a local backend, with no data sent to external servers. It's designed for developers and professionals who need AI assistance but want to protect confidential information from being exposed.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
OP here. I built this because I recently caught myself almost pasting a block of logs containing AWS keys into Claude. The Problem: I need the reasoning capabilities of cloud models (GPT/Claude/Gemini), but I can't trust myself not to accidentally leak PII or secrets. The Solution: A Chrome extension that…
Does a similar job
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HeimWallJul 2026 · heimwall.ai · ▲34Signal, not surveillance. See how your engineers use Cursor, Claude Code, and Copilot: catch leaked secrets, PII, and confidential data, without blocking them or reading their prompts.
anonym.legal for ChromeMar 2026 · anonym.legal · ▲1Anonymize PII before sending to ChatGPT, Claude & Gemini
PII Firewall EdgeDec 2025 · pii-firewall-edge-web.vercel.app · ▲5Hi HN, I built PII Firewall because I got tired of watching "privacy" APIs secretly pipe user data to cloud AI models. If you're using GPT/Claude to redact PII, you're literally giving the AI your PII. What makes this different: - Zero AI – deterministic regex + 30 checksum validators (Luhn, Verhoeff, Mod 11/97) - Zero storage – processes on Cloudflare edge, no logs, no persistence - 152 PII types – SSN, Aadhaar, 50+ country IDs, 20 API key formats, crypto wallets - Two modes: `/fast` (2-5ms) for structured PII, `/deep` (5-15ms) adds names/addresses via 2000+ name…
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Hi HN, I’m one of the maintainers of Bridge Anonymization. We built this because the existing solutions for translating sensitive user content are insufficient for many of our privacy-concious clients (Governments, Banks, Healthcare, etc.). We couldn't send PII to third-party APIs, but standard redaction destroyed the translation quality. If you scrub "John" to "[PERSON]", the translation engine loses gender context (often defaulting to masculine), which breaks grammatical agreement in languages like French or German. So we built a reversible, local-first pipeline for Node.js/Bun. Here…
Local Browser AI2025 · blog.alexewerlof.com · ▲15Using the new Prompt API to build a free open source privacy-first chat extension that runs on Chrome or Edge on Linux, Mac, Windows and ChromeOS
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