Assinatura
Sign PDFs with no internet
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Take a photo of your signature and sign PDF contracts in seconds, in blue or black ink. All on your phone, no internet.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Marlon Alcantara, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Marlon Alcantara
- Size
- 39.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Portuguese
- Age Rating
4+
- 4+
- Copyright
- © 2026 COG.IA