StampThat

Name: StampThat
Author: Nicolas Micaux

By: Nicolas Micaux

Protect yourself from Identity Theft by using Stamp That!

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Install

Features & Capabilities

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.

🆓 FREE weekly quota included
💳 Buy credits for unlimited usage

👉 Install the Stamp That Chrome extension in one click and protect your personal data BEFORE sharing, NOT WHEN IT'S TOO LATE.

User Growth & Download Statistics

Add-on

By:

Nicolas Micaux

Daily users:

Version:

1.0.6 Last updated: 2026-02-10

Version code:

6146187

Creation date:

2026-01-13

Risk:

Permissions:

storage
<all_urls>

Content scripts matches:

<all_urls>

Size:

2.34MB

Email:

st*****@gmail.com

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-03

Compare stats and ranking:

Ranking

# 143,974 ▲ 764

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Nicolas Micaux

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/stampthat/

Email:

st*****@gmail.com

Is StampThat Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

StampThat requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

StampThat may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Medium **** ********* *** ***** ** *** **** * ******* *** ********** *** *** ** ****** ** *****
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****