PDF Signer & Stamp Tool
Upload a PDF, position your signature and seal visually on each page, then download a scanned-look signed document — 100% private, processed in your browser.
Upload a PDF to begin
Then upload a signature or seal image and click "Place on Active Page"
How to Sign a PDF Online — Free & Completely Private
- Upload your PDF — drag and drop or click the upload zone. The document renders page by page in the workspace on the right.
- Upload your signature and/or seal image — PNG images with transparent backgrounds work best. The tool can automatically remove white backgrounds.
- Position stamps — click Place on Active Page to add to the visible page, or All Pages to stamp every page. Then drag and resize each stamp freely on the canvas.
- Configure output — choose color mode, scan quality, and optional scanner noise for an authentic scanned look.
- Download — click "Compile & Download Signed PDF" to get your finished document instantly.
All processing runs entirely in your browser using PDF.js and PDF-Lib. No files are ever sent to any server — your documents remain completely private.
When Should You Use a Client-Side PDF Signer?
An online PDF signer is essential when you need to sign contracts, agreements, invoices, or official letters quickly without the security risks of uploading sensitive documents to external servers. Most online signature platforms process your files on their cloud databases, which poses a significant risk to trade secrets, personal details, and sensitive contract terms.
This client-side signing tool is perfect for:
- Signing Executive Contracts: Keep corporate partnerships, NDAs, and executive employment agreements fully confidential.
- Applying Official Stamps & Seals: Drag and place digital company stamps or seal images across single or multiple pages instantly.
- Preparing Documents for Government Portals: Add visual signatures or initials and compile them using our "Grayscale Scan" mode to match official documentation standards.
- Signing Invoices and Purchases: Freelancers, developers, and small business owners can stamp invoice PDF files locally in seconds.
Frequently Asked Questions (FAQ)
Is this PDF signer online free?
Yes. Our browser-based electronic signature tool is 100% free to use. You can sign as many documents as you need without signup or limitations.
Do my documents leave my device?
No. Unlike standard electronic signature software, all PDF rendering and stamping happen inside your local browser using client-side JavaScript. Your files are never uploaded to any server, guaranteeing complete document privacy.
Can I add a custom stamp or signature image?
Absolutely. You can draw your signature, type it, or upload custom images (such as signatures, company seals, or stamps) and position them on any page of your document.
What is the scanned scanner effect?
Our tool can simulate a physical scanner by applying slight rotations, noise, and grayscale conversion to make the signed PDF look like it was physically printed, signed, and scanned back in.