
Assinatura
Sign PDFs with no internet
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Free
Rating summary
About
Sign PDFs on your phone with your real signature. Pick the document, take a photo of your signature on paper, and Assinatura places it on the right spots, looking like blue or black pen ink — ready to print or send.
Everything happens on your device, with no internet: the PDF, the signature photo and the signed document never leave your phone.
• Finds the signature places by itself: signature lines, "Signature:" fields, names and roles such as Tenant, Landlord or Client, and signature fields in PDF forms
• Witness lines are recognized but stay off until you turn them on
• Cleans up the photo: removes the paper background, shadows and specks, keeping only the stroke, with transparency
• Blue or black ink with a natural stroke: each signature gets small variations in size and tilt, like one made by hand
• Optional initials on the other pages, in the bottom-right corner, clear of the footer
• Drag, resize, delete, or tap anywhere to add a signature
• Keeps the original PDF: text stays sharp and searchable
• Share the signed PDF with any app (messaging, email, cloud storage) or print it directly
• Open PDFs from other apps with "Open with" / "Share"
• Your signature is kept only on this device for next time — and can be deleted whenever you want
No account, no ads, no subscription.
Important: Assinatura places the image of your handwritten signature on the document. It does not create certificate-based digital signatures. Check that the recipient accepts documents signed this way.
Privacy policy: https://cog.ia.br/apps/assinatura/privacy
Published by COG.IA.
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What's New in Assinatura
1.0.0
October 13, 2026




