StampThat Autor: Nicolas Micaux

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.