Sign PDF Free
Browser-based signing. Your files never leave your device.
Step 1: Upload Your PDF
Drop your PDF here or click to browse
Max 10MB, up to 50 pages
100% local processing — your file stays on your device, never uploaded to any server
Why Choose Our Local PDF Signer?
100% Local Processing
Your PDF is processed entirely in your browser. Zero server uploads - we literally cannot see your files.
Complete Privacy
Pure client-side technology. No data collection, no tracking, no server communication whatsoever.
Free & Unlimited
No signup, no limits, no hidden costs. Because it runs locally, we have zero server costs.
How Local PDF Signing Works
Unlike other PDF signing tools that upload your files to their servers, our tool processes everything in your browser using client-side JavaScript.
Select File Locally
Your PDF is loaded directly into your browser's memory using the File API. No network request is made — the file never leaves your device.
Browser-Based Processing
Your signature is captured on an HTML Canvas and embedded into the PDF using pdf-lib — a pure JavaScript library running entirely in your browser.
Direct Download
The signed PDF is generated on your device and downloaded directly. Zero server involvement means zero privacy risk.
Privacy Guarantee: We use zero server-side processing for this tool. Your documents are never transmitted over the internet. Open your browser's Network tab to verify — you'll see no file uploads occurring.
Need to Send Documents for Others to Sign?
Our full e-signature platform lets you send documents for signature, track status in real-time, and maintain secure audit trails.
Frequently Asked Questions
Is my PDF file uploaded to any server?
Absolutely NOT. Your PDF is processed 100% locally in your browser using pure client-side JavaScript. The file NEVER leaves your device - there is zero server communication. We cannot see, access, or store your documents because they literally never reach our servers. This is the most private way to sign a PDF online.
How does local PDF signing work technically?
Our tool uses modern browser technologies (JavaScript, Canvas API, pdf-lib library) to process your PDF entirely on your device. When you select a file, it's loaded into your browser's memory - not uploaded anywhere. Your signature is drawn on an HTML canvas, then embedded into the PDF using pdf-lib. The final signed PDF is generated on your device and downloaded directly. No internet upload ever occurs.
Is this tool really free? What's the catch?
Yes, 100% free with unlimited usage forever. The 'catch' is actually a benefit for you: because all processing happens locally in your browser, we have zero server costs to run this tool. No signup, no credit card, no email required. Use it unlimited times.
Can I use this offline?
Once the page is loaded, the tool works without an internet connection because all processing is done locally on your device. You can sign PDFs even if you lose WiFi or go into airplane mode. The only requirement is loading the page initially.
Is the electronic signature legally valid?
Electronic signatures are legally recognized in most countries under laws like ESIGN (US), eIDAS (EU), and PIPEDA (Canada). For documents requiring audit trails, timestamp verification, or multi-party signing workflows, consider our full e-signature platform.