AIgetsthecontext.Notyourprivatedata.

PasteGuard masks names, emails, secrets, and customer data before they reach ChatGPT, Claude, AI APIs, or coding agents.

Start locally Install browser extension

Providers see placeholders, not originals

AI Input·What the model receives

Please help me respond to the support ticket from

Name

Key

regarding the 401 authentication error they reported.

Try it!

How it works

You keep the originals. AI providers receive placeholders.

You type or paste

Use ChatGPT, Claude, your own app, Codex, or Claude Code normally.

PasteGuard hides it

Names, emails, API keys, and other private data become [[PERSON_1]], [[EMAIL_1]], etc.

AI responds

The model still understands the task. It does not need the original values.

You see originals

Where supported, PasteGuard restores the originals in the response.

PasteGuard

Live

Requests6total

Masked100%6 of 6

Scan Time97ms avg

Rate6/hour

TimeModelLangPII DetectedSecrets

16:21:19gpt-5.2ENPERSONEMAILAPI_KEY

Masked prompt

Please help me respond to the support ticket from [[PERSON_1]] at [[EMAIL_1]] regarding the [[API_KEY_1]] authentication error.

16:19:06gpt-5.2ITEMAILPERSONPASSWORD

16:18:55gpt-5.2ESEMAILPERSONPHONE—

16:18:45gpt-5.2FREMAILPERSONJWT

Protect every way your team uses AI

One privacy layer for Browser Chat, Apps & APIs, and Coding Agents.

Browser Chat

Beta

Use ChatGPT, Claude, and Gemini for real work without pasting raw names, emails, or confidential details into the provider.

ChatGPTClaudeGemini

Browser extension

Experimental builds for ChatGPT, Claude, and Gemini.

Install browser extensionWorks before text reaches the AI provider.

Preview

PasteGuardAuto + Manual

Auto-masking active

Today

847

Total

email5

person4

phone3

⌘⇧Kto mask selected text

Apps & APIs

Put PasteGuard in front of your app or SDK so private data is masked before OpenAI, Anthropic, or another provider sees it.

Your appSDKsOpenAI APIAnthropic APIHTTP APIs

Your appor SDK

PasteGuard

[[EMAIL_1]]sarah@acme.com

OpenAI, Anthropic, ...

Coding Agents

Use Codex, Claude Code, Cursor, or other coding agents without sending API keys, passwords, or connection strings from your project.

CodexClaude CodeCursorWindsurf

.env.local

1# Database

2DATABASE_URL=postgres://localhost:5432/app

4# API Keys

5OPENAI_API_KEY=[[API_KEY_SK_1]]masked

6ANTHROPIC_API_KEY=[[API_KEY_SK_2]]masked

8# AWS Credentials

9AWS_ACCESS_KEY_ID=[[API_KEY_AWS_1]]masked

10AWS_REGION=us-east-1

PasteGuard Active

3 secrets maskedENVUTF-8

For teams that cannot send raw data to AI

PasteGuard is for teams that cannot paste raw customer data, client files, or secrets into ChatGPT, Claude, or model APIs.

Run it yourself

Use it locally or self-host it in your own environment.

No telemetry

Open-source, auditable, and built without tracking.

Fits stricter AI policies

Useful for GDPR, DORA, client confidentiality, and internal AI policies.

Compliance boundary

PasteGuard helps reduce what reaches AI providers. Your legal and security controls still decide compliance.

Protected automatically

Detects over 30 types of private data and secrets in any language.

NamesEmailsPhone numbersCredit cardsIBANsEU VAT numbersIP addressesLocationsAPI keysSSH keysJWT tokensPasswordsConnection stringsPrivate keysBearer tokens

Quick start

Get up and running in under a minute.

Install with Docker

Recommended

$docker run --rm -p 3000:3000 ghcr.io/sgasser/pasteguard:latest

Then open localhost:3000

OpenAI Compatible

Apps, SDKs, agents

http://localhost:3000/openai/v1

Set as OPENAI_BASE_URL

Anthropic

Claude, Claude Code

http://localhost:3000/anthropic

Set as ANTHROPIC_BASE_URL

Read the docs

BetaBrowser extension for ChatGPT, Claude & Gemini

Install browser extension

Open source & self-hosted

Fully self-hosted, auditable, and telemetry-free under the Apache 2.0 license.

Star on GitHub