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PII Firewall

Free#20 of 23 in AI Guardrail Software

PII Firewall: A focused, configurable PII privacy layer for self-hosted LLM applications. Ranked #20 of 23 in AI Guardrail Software by our editors (6.5/10); pricing: Open source; best for teams focused specifically on PII protection.

6.5/10Editor score
Visit PII Firewall
PII Firewall6.5 Visit PII Firewall

At a glance

  • Editor score
    6.5 / 10
  • Pricing
    Open source
  • Best for
    Teams focused specifically on PII protection
  • Paid from
    Free
  • Prompt injection defense
    No
  • Facts checked
    21 Sep 2026
PII Firewall screenshot

  • Where it wins

    • Deep PII detection with configurable backends and custom recognizers
    • Anonymization, vault mappings, rehydration, and GDPR-oriented forgetting
    • Integrations for major providers, frameworks, HTTP, FastAPI, and streaming

  • Where it doesn't

    • Does not verify prompt-injection attacks
    • Does not provide jailbreak detection
    • Self-hosted deployment requires Linux or API integration

Our verdict on PII Firewall

PII Firewall is an open-source privacy layer for LLM applications that detects sensitive information before requests reach providers or local models. It is intended for teams that need focused PII protection across healthcare, finance, legal, generic, or custom domains. Distributed as a Python package, it can wrap LLM calls, HTTP endpoints, FastAPI services, and streaming workflows in a self-hosted deployment.

Its standout capability is the depth of its PII workflow. Detection can use regex, Presidio, GLiNER, Transformers, and other configurable backends, while custom regex rules and entity recognizers support domain-specific requirements. Detected values can be pseudonymized, redacted, masked, generalized, hashed, or passed through. After LLM processing, response rehydration restores original values, including through streaming token rehydration. Tenant-scoped vault mappings, audit traces with confidence scores and replacements, and GDPR-oriented forget functionality add control for privacy-sensitive applications.

Integration coverage is broad for a focused privacy layer. PII Firewall supports OpenAI, Anthropic, Mistral, Ollama, LiteLLM, LangChain, and FastAPI, along with provider, framework, HTTP, and streaming integrations. Teams choosing it should be specifically prioritizing PII detection, transformation, and restoration within their LLM pipeline. It is less suitable as a complete AI guardrail system because it does not verify prompt-injection or jailbreak defenses. Organizations seeking those protections alongside PII handling should consider a broader guardrail approach; teams focused on sensitive-data controls should find PII Firewall’s configurable profiles, recognizers, vault mappings, and audit traces more relevant.

Your product? Our editors can test PII Firewall in depth and publish a review, labelled as paid · from $149/mo →

PII Firewall pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.
See plans on pii-firewall.com

PII Firewall fact sheet

Free planNot verified
Paid fromFree
DeploymentSelf_hosted
Prompt injection defenseNo
PII detectionYes
Jailbreak detectionNo
Custom policiesYes
SDK languagesPython
DeploymentSelf-hosted
PlatformsLinux
Compliance & securityGDPR
SupportDocs, Community
Built forSolo, Small business (editorial estimate)
Integrations7 integrations: OpenAI, Anthropic, Mistral, Ollama, LiteLLM, LangChain …
PricingOpen source
Websitepii-firewall.com
Facts checked21 Sep 2026

PII Firewall integrations

PII Firewall lists 7 integrations on its own site.

  • OpenAI
  • Anthropic
  • Mistral
  • Ollama
  • LiteLLM
  • LangChain
  • FastAPI

Alternatives to PII Firewall

See all PII Firewall alternatives →

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Featured on iTechGuides

Featured on iTechGuides — PII Firewall 6.5/10

PII Firewall is listed in our AI Guardrail Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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