SignBack: Sign PDF Documents
Private Form Filler & Scanner
About
Effortlessly sign and fill out documents on your device without printing or scanning. Create multiple identities for different roles and use the smart assistant to quickly complete forms. All processing is done locally for maximum privacy.
What's New in SignBack
1.0.8
August 11, 2026
Signatures now look more natural, with smoother pen-like ink, speed- and pressure-responsive strokes, and tapered ends. You can also copy or share signed documents directly from the document list. When emailing a large PDF, SignBack can offer a smaller compressed copy while still letting you send the original with iCloud Mail Drop if you prefer.
MoreFAQ
Does SignBack have ads?
SignBack is completely free and does not contain any advertisements. Users can enjoy all features without interruption or the need to view ads.
How much does SignBack cost?
SignBack is 100% free to use. There are no subscriptions, trials, watermarks, or hidden fees associated with any of its features.
What devices does SignBack support?
SignBack is available for iPhone and iPad. It is designed to work seamlessly on Apple's mobile operating systems.
Is SignBack safe for sensitive documents?
Yes, SignBack prioritizes security and privacy. All document processing occurs locally on your device, ensuring your sensitive paperwork never leaves your phone.
How often is SignBack updated?
SignBack was last updated on August 4, 2026, with version 1.0.6. This indicates a recent update, suggesting ongoing development and support.
Can I use SignBack offline?
Yes, SignBack is built for offline use. Since all processing is done locally on your device, you can sign and fill documents without an internet connection.
What file formats can SignBack open?
SignBack supports a wide range of formats including PDFs, Word documents (.docx, .doc), Pages files, plain and rich text files, photos, and scans. Everything is automatically converted to a clean PDF on-device.
What is the age rating for SignBack?
SignBack has an age rating of 4+. This means it is suitable for children and adults, with no mature content.