AI gets the context. Not your private data.

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

Requests 6 total

Masked 100% 6 of 6

Scan Time 97 ms avg

Rate 6 /hour

Time Model Lang PII Detected Secrets

16:21:19 gpt-5.2 EN PERSONEMAIL API_KEY

Masked prompt

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

16:19:06 gpt-5.2 IT EMAILPERSON PASSWORD

16:18:55 gpt-5.2 ES EMAILPERSONPHONE —

16:18:45 gpt-5.2 FR EMAILPERSON JWT

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.

ChatGPT Claude Gemini

Browser extension

Experimental builds for ChatGPT, Claude, and Gemini.

Install browser extension Works before text reaches the AI provider.

Preview

PasteGuard Auto + Manual

Auto-masking active

Today

847

Total

email 5

person 4

phone 3

⌘ ⇧ K to 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 app SDKs OpenAI API Anthropic API HTTP APIs

Your app or 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.

Codex Claude Code Cursor Windsurf

.env.local

1 # Database

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

4 # API Keys

5 OPENAI_API_KEY=[[API_KEY_SK_1]] masked

6 ANTHROPIC_API_KEY=[[API_KEY_SK_2]] masked

8 # AWS Credentials

9 AWS_ACCESS_KEY_ID=[[API_KEY_AWS_1]] masked

10 AWS_REGION=us-east-1

PasteGuard Active

3 secrets masked ENV UTF-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.

Names Emails Phone numbers Credit cards IBANs EU VAT numbers IP addresses Locations API keys SSH keys JWT tokens Passwords Connection strings Private keys Bearer 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

Beta Browser 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