About
What is signbro.site?
SignBro is a free, lightweight, browser-based PDF stamping tool. Created by Asad Waheed. Users upload a signature image and a stamp image and apply them to every page of a PDF with a single click. No account, no backend, no upload to any external server.
No data leaves your device
All PDF processing happens in your browser using pdf-lib. Your files are never uploaded to any server.
Runs entirely client-side
SignBro is a static web app. There is no backend, no database, and no account required.
Free and open source
SignBro is free for personal and commercial use. The source code is publicly available.
Works on any PDF
Apply a signature and stamp to every page of any PDF in seconds, regardless of page count.
How it works
When you upload files, they are read by your browser using the FileReader API and processed using pdf-lib, a pure-JavaScript PDF library. The signed PDF is generated entirely in memory and downloaded to your device.
No network requests are made to any third-party service during signing. Open your browser's Network tab to verify this.
Who is SignBro for?
Anyone who needs to quickly apply a signature or company stamp across a multi-page PDF — contracts, invoices, official documents — without installing desktop software or paying for a subscription service.