Your prompts never leave your browser

Protect your sensitive data in LLMs

SafePrompt automatically detects your API secrets, emails, and personal data and replaces them with a fake token, directly in your browser — before they reach ChatGPT, Claude, or Gemini.

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  • GDPR Compliant
  • EU Hosted
  • 100% Local
  • Stripe Secured

100% in your browser • No data in transit • GDPR EU

How SafePrompt protects your data

Everything happens in your browser. No sensitive data reaches the LLM.

Your prompt

My IBAN is FR76 4061 ...

SafePrompt detects

Secrets, IBAN, NIR, PII

Tokens sent

My ⟦IBAN_1⟧ is ⟦SECRET_2⟧

The LLM responds

Your ⟦IBAN_1⟧ starts with ...

Local restoration

Your IBAN FR76 4061 ... starts with ...

How it works

3 steps, 100% in your browser

  1. Detection

    The extension analyzes your prompt in real time and identifies secrets, emails, keys, and personal data.

  2. Local masking

    Each sensitive piece of data is replaced by an anonymous fake token (e.g., [EMAIL_1]). The replacement happens in your browser — nothing leaves.

  3. Local restoration

    The LLM response arrives with the fake tokens. SafePrompt replaces them with your real data, always in your browser.

SafePrompt in action

Before / after — how SafePrompt protects your prompts in practice.

Without SafePrompt — what the LLM would see
The LLM receives [EMAIL_1], [PHONE_1], [FR_NIR_1], [CREDIT_CARD_1], [IBAN_1] instead of the real values. No sensitive data left your browser.
ChatGPT screenshot — the submitted prompt contains anonymous placeholders [EMAIL_1], [PHONE_1], [IBAN_1] instead of the user's original data.

The LLM receives [EMAIL_1], [PHONE_1], [FR_NIR_1], [CREDIT_CARD_1], [IBAN_1] instead of the real values. No sensitive data left your browser.

With SafePrompt — locally restored response
The LLM response comes back with placeholders. SafePrompt swaps them with the real values inside your browser — the LLM never saw them.
Screenshot of a ChatGPT response containing Python code — SafePrompt has locally restored the real values (jean.dupont@example.com, +33 6 12 34 56 78, FR76 3000…) with an explanatory tooltip.

The LLM response comes back with placeholders. SafePrompt swaps them with the real values inside your browser — the LLM never saw them.

Extension popup — secrets blocked, tokenized PII, and recent activity per platform (ChatGPT, Gemini, Claude…).
Screenshot of the SafePrompt popup showing weekly stats: 1 blocked secret, 3 tokenized PII, 0 PII sent in plain text, and per-platform activity history.

Extension popup — secrets blocked, tokenized PII, and recent activity per platform (ChatGPT, Gemini, Claude…).

Dashboard — tenant overview, 7-day counters, incidents, and extension adoption.
Screenshot of the SafePrompt dashboard: incident counters (4), blocked secrets (1), masked personal data (3), and a CTA to install the Chrome/Firefox extension.

Dashboard — tenant overview, 7-day counters, incidents, and extension adoption.

Analytics — incidents per week, breakdown by entity type (Email, SIREN, API keys), top users.
Screenshot of the Analytics page: 12-week incident curve, entity-type donut (Email 50%, SIREN 25%, AWS key 25%) and top users.

Analytics — incidents per week, breakdown by entity type (Email, SIREN, API keys), top users.

Using SafePrompt?

Help other teams discover sovereign GDPR-native protection. A few words on the store make a real difference for our ranking.

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Why everything in your browser?

The only way to get a real privacy guarantee

  • No data in transit

    Your original prompts never leave your machine. Unlike server-side data interception tools, there's nothing to intercept.

  • 100% EU infrastructure

    Only anonymous metadata (usage statistics) transits — to our servers in Frankfurt/Amsterdam. Never the content of your prompts.

  • Verifiable architecture

    The detection logic runs in your browser. You can inspect the extension code. Trust is proven, not proclaimed.

Architecture & privacy →

What SafePrompt protects

The concrete risks of generative AI in the enterprise — and how SafePrompt answers them.

AI DLP for prompts sent to ChatGPT, Claude, Gemini

SafePrompt acts as a dedicated AI DLP for prompts: real-time detection of secrets, account numbers, IDs and personal data inside the browser, before they reach the LLM. No proxy, no server-side traffic to intercept.

Prevent ChatGPT data leaks and other LLM exfiltrations

Most ChatGPT data leaks start with an innocent copy-paste. SafePrompt automatically masks API keys, emails and identifiers before they leave your browser — removing the leak at the source rather than after the fact.

Visibility on AI shadow IT inside your organisation

AI shadow IT means LLM tools used by your teams without IT approval. The SafePrompt dashboard aggregates detection types and platforms so you finally see real LLM usage — without ever exposing prompt content.

GDPR compliance for generative AI in the enterprise

GDPR AI compliance — and now NIS2 — requires proving where data flows. SafePrompt hosts everything in the EU (Supabase Frankfurt, M-KIS infrastructure in Lorraine, Stripe Dublin), provides a DPA on Business plans, and maintains an audit log of administrative actions.

Enterprise LLM data protection

Enterprise LLM data protection rests on three pillars: local detection, masking before transit, and centralised audit. SafePrompt covers all three without deploying a proxy, in under five minutes via Google Workspace, Microsoft Intune or Firefox Enterprise.

Who is it for?

  • Solo & Freelancers

    Developers, consultants, and freelancers using LLMs with client data. Protect your API secrets and contracts without changing your habits.

  • SMEs & growing start-ups

    Teams of 5 to 49 people. Centralized dashboard, team management, team anonymization mode. GDPR compliance without a dedicated IT department.

  • Large enterprises

    50+ employees. Admin actions audit log, Data Processing Agreement (DPA) included, personalized onboarding with assisted Intune/GPO setup. Roadmap: SAML/OIDC SSO and SCIM provisioning (Q3 2026). For CISOs who need proof, not promises.

Your prompts never leave your browser

SafePrompt automatically detects your API secrets, emails, and personal data and replaces them with a fake token, directly in your browser — before they reach ChatGPT, Claude, or Gemini.

Get started freeView pricing