StampThat – Automatic watermarking to prevent identity theft

Summary: StampThat automatically adds customizable watermarks to documents uploaded on any website, protecting sensitive files from misuse. It processes files locally in the browser, ensuring privacy by never uploading documents to external servers.

What it does

StampThat detects document uploads across websites and instantly applies watermarks to images, PDFs, and ZIP archives. It supports customizable rules based on domain and file type, operating entirely within the browser without sending files externally.

Who it's for

It is designed for individuals sharing sensitive documents online, including renters, freelancers, students, and anyone submitting IDs or contracts to banks, landlords, or administrations.

Why it matters

By watermarking documents before sharing, StampThat prevents scammers from reusing files to commit fraud or identity theft, addressing risks associated with online document submission.