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Sign contracts, invoices, agreements, and official paperwork on the go with PDFjin's completely responsive, mobile-friendly PDF signer. Traditional PDF signing tools force you to constantly zoom, pan, and crop on tiny smartphone screens, but our advanced signer automatically scales your document pages to fit your screen layout seamlessly. Draw a natural signature with your finger or stylus, or select a pre-saved signature, and place it exactly where you need it on the page in a single tap. PDFjin requires no login, subscription, or software downloads, giving you instant access to secure, legally-compliant digital signatures on any desktop or mobile device. All signed documents are processed through highly secure end-to-end encrypted connections and are permanently deleted from our servers post-download to protect your identity and data.