AI Prompt Anonymizer

Scrub sensitive data out of any prompt before you paste it into ChatGPT, Claude, or Gemini. Auto-detect and redact names, emails, phone numbers, API keys, credit cards, IPs and more — 100% in your browser, nothing ever uploaded.

The AI Prompt Anonymizer finds and masks personally identifiable information (PII) and secrets in your text so you can safely share prompts, logs, and documents with AI assistants and coworkers. Detection and redaction run entirely on your device — your data never touches a server.

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AI Tools
Includes
6 features
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Free · No sign-up
Privacy
Runs in your browser
AI Prompt Anonymizer

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How to use

How to use AI Prompt Anonymizer

  1. 01

    Paste your prompt or document

    Drop in the text you want to share with an AI — a support ticket, error log, contract clause, or draft email. Everything is processed locally in your browser.

  2. 02

    Review the detected sensitive data

    The anonymizer instantly highlights every name, email, phone number, API key, credit card, IP address and more, with a live risk score and a per-category breakdown.

  3. 03

    Choose how to mask it

    Switch between labeled tokens like [EMAIL_1], solid █ redaction, or realistic fake replacements. Toggle categories on or off and add your own custom terms to always hide.

  4. 04

    Copy the clean version

    Copy the anonymized text and paste it into ChatGPT, Claude, or Gemini with confidence. Nothing sensitive leaves your machine.

  5. 05

    Restore the AI's answer (optional)

    When the assistant replies using your tokens, paste its response into the Restore tab to swap the placeholders back to your real values automatically.

Use cases

Common use cases

  • —Redact customer names, emails, and order numbers from support tickets before asking AI to draft a reply
  • —Strip API keys, tokens, and IP addresses out of error logs and stack traces before debugging with an LLM
  • —Anonymize contracts, medical notes, or HR documents so you can summarize them without leaking identities
  • —Remove personal data from spreadsheets and CSV snippets before analysis
  • —Sanitize screenshots-turned-text and chat exports before sharing them publicly
  • —Meet GDPR / HIPAA data-minimization expectations when using third-party AI tools
Overview

Why you should anonymize prompts before using AI

Every prompt you paste into ChatGPT, Claude, or Gemini may be retained, logged, or used to improve models depending on the provider and plan. If that prompt contains a customer's name, an employee's email, a live API key, or a credit-card number, you've effectively shared sensitive data with a third party — a real compliance and security risk. The AI Prompt Anonymizer removes that risk at the source by stripping identifiers out of your text before it ever leaves your browser, so you keep the productivity of AI without exposing people or secrets.

What it detects — and how accurately

The tool ships with 18+ purpose-built detectors covering emails, phone numbers, US Social Security numbers, credit-card numbers (validated with the Luhn checksum to avoid false positives), IPv4/IPv6 and MAC addresses, URLs, IBANs, crypto wallet addresses, JWTs, cloud API keys (OpenAI, AWS, Google, GitHub), street addresses, @handles, and best-effort person names. High-risk categories like secrets and card numbers are weighted heavily in the on-screen risk score so you can see at a glance how exposed a piece of text is.

Reversible by design

Redaction usually destroys information, which is a problem when the AI needs to answer using the very values you masked. This anonymizer solves that with reversible tokens: each unique value maps to a stable placeholder such as [PERSON_1] or [EMAIL_2]. Paste the assistant's reply into the Restore tab and every token is swapped back to your real data — giving you a private round-trip that no cloud service can see.

Private by default, free forever

There is no upload, no account, and no server call anywhere in this tool. All detection and masking happens with JavaScript on your device, which means it works offline, leaves no trace, and is safe for regulated data. Because it's fully client-side, it's also instant — you get live results as you type with no rate limits.

Features
01
18+ PII & secret detectors (email, phone, SSN, credit card, API key, IP, crypto wallet, IBAN & more)
02
Three masking modes: labeled tokens, solid redaction, or realistic fake data
03
Reversible tokens — restore the AI's reply back to your real values
04
Per-category toggles + custom always-mask terms
05
Live risk score and entity breakdown
06
100% client-side — nothing is uploaded, logged, or stored
FAQ

Frequently asked questions

How do I anonymize a prompt before using ChatGPT?+

Paste your text into the AI Prompt Anonymizer. It instantly detects names, emails, phone numbers, API keys, credit cards, IPs and more, and replaces them with tokens, redaction bars, or realistic fake data. Copy the clean version and paste that into ChatGPT instead of the original. All of this happens in your browser — nothing is uploaded.

Is my data uploaded to a server?+

No. Every detector runs 100% client-side in JavaScript on your own device. There is no API call, no account, and no logging. You can even disconnect from the internet and the tool still works, which makes it safe for confidential and regulated data.

What types of sensitive data can it detect?+

18+ categories: email addresses, phone numbers, US Social Security numbers, credit-card numbers (Luhn-validated), IPv4/IPv6 and MAC addresses, URLs, IBANs, crypto wallet addresses (BTC/ETH), JWTs, cloud API keys (OpenAI, AWS, Google, GitHub), street addresses, @handles, and best-effort person names. You can toggle each category on or off and add your own custom terms.

Can I get the AI's answer back with my real data restored?+

Yes. In token mode each value maps to a stable placeholder like [PERSON_1]. When the assistant replies using those placeholders, paste its response into the Restore tab and the tool swaps every token back to your original values — a fully private round-trip.

What's the difference between the masking modes?+

Tokens (e.g. [EMAIL_1]) are reversible and keep the text readable for the AI. Redaction replaces data with solid █ bars for maximum secrecy but isn't reversible. Fake data swaps in realistic-looking replacements (a fake name, a 555 phone number) so the prompt still reads naturally while hiding the real values.

Is this suitable for GDPR or HIPAA workflows?+

Because the tool never transmits or stores your text, it supports data-minimization and de-identification goals under regulations like GDPR and HIPAA. It's a strong first line of defense, though you remain responsible for verifying the output and following your organization's compliance policies before sharing any content.

Does it work for log files and source code?+

Yes. It's especially useful for stripping API keys, bearer tokens, IP addresses, and email addresses out of error logs, stack traces, and config snippets before you debug them with an AI assistant.

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