Sign your PDF documents with digital certificates directly from your phone. A professional-grade signature tool that is completely free, with no ads and no in-app purchases. Works fully offline.

KEY FEATURES
● Digital Certificate Signing – Sign PDFs using PFX/P12 certificates for legally valid electronic signatures compliant with eIDAS standards
● 100% Free With No Ads – Full functionality with zero ads, zero paywalls, zero subscriptions. Every feature available from the start
● Works Fully Offline – No internet connection required. Sign documents anywhere, anytime, even in airplane mode
● Zero Tracking – No analytics, no telemetry, no usage data collection, no third-party SDKs watching what you do. Absolute privacy
● Private and Secure – All document signing happens locally on your device. Your files are never uploaded to any server. Nothing leaves your phone. Ever.
● Fast Workflow – Select your PDF, choose your certificate, sign. Done in seconds
● Multiple Signatures – Add multiple digital signatures to a single document
● Certificate Compatibility – Works with certificates issued by trusted Certificate Authorities
● Lightweight – No bloated features, just a reliable PDF signing tool

WHY SIGN PDF?
Most PDF signing apps are full of ads, lock basic features behind paywalls, upload your sensitive documents to external servers, and track everything you do. Sign PDF is the opposite. Completely free, fully offline, no tracking, no data collection, no permissions you don't need. Just a signing tool that respects you and your documents.

TRUSTED BY PROFESSIONALS
Freelancers signing contracts. Accountants approving invoices. Lawyers authenticating legal documents. Business owners closing deals on the go. Sign PDF is built for anyone who needs fast, secure, and legally valid digital signatures on their mobile device.

TOTAL SECURITY
Your documents and certificates never leave your device. No cloud processing, no third-party servers, no data collection, no analytics, no tracking of any kind. Sign PDF requires only the permissions strictly necessary to read and save your files. Nothing more. Privacy is not a feature — it's the foundation.
Sign smarter. Sign securely.

Sign PDF - without ads