# StampThat

> Protect yourself from Identity Theft by using Stamp That!

Canonical page: [https://chrome-stats.com/d/stampthat](https://chrome-stats.com/d/stampthat)

## Overview

- **ID:** `stampthat`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Nicolas Micaux
- **Category:** privacy-security
- **Version:** 1.0.6
- **Last updated:** 2026-02-10
- **First published:** 2026-01-13
- **Size:** 2.34 MB
- **Data as of:** 2026-09-13
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/stampthat/)

## Description

StampThat automatically watermarks your documents the moment you upload them—anywhere on the web: email, Google Drive, WhatsApp Web, administration portals, bank forms, and more.

A watermarked ID or contract cannot be reused to take out loans or commit fraud. With StampThat, your documents stay usable for their purpose, but worthless to hackers.

How it works
- 📤 Detects document uploads automatically (drag & drop, paste, file inputs)
- ✍️ Adds customizable watermark instantly
- 🌐 Works on any website
- ✅ Supports images, PDFs, and ZIP archives
- 🔍 Format whitelists & blacklists for full control

All processing happens locally in your browser. Your files never leave your computer.

Built for people who share sensitive documents
- Anyone looking for a rent, submitting documents to banks, landlords, or administrations
- Freelancers sending IDs or contracts
- Students applying to job offers 

Privacy by design
- ✅ 100% local processing
- 🚫 No data collection

Stamp That is available in 18 languages.
<ul><li>🆓 FREE weekly quota included</li><li>💳 Buy credits for unlimited usage</li></ul>
👉 Install the Stamp That Chrome extension in one click and protect your personal data BEFORE sharing, NOT WHEN IT'S TOO LATE.

## Rankings

- #136,422 — Overall

## Permissions and access

### Permissions

- `storage`
- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [Deepstamp - Document Certification](https://chrome-stats.com/d/deepstamp-certify)
- [Privacy Interceptor](https://chrome-stats.com/d/privacy-interceptor) — 5.00 / 5
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- [Leakuidator+](https://chrome-stats.com/d/leakuidatorplus) — 18 users, 2.00 / 5
- [PDFMarshal privacy first PDF tools](https://chrome-stats.com/d/pdfmarshal) — 12 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/stampthat)