# SignBack: Sign PDF Documents — Fill Forms. Send Privately. > Free, private, and fast PDF signing and form filling app. (iPhone/iPad app by Silvergrove Labs LLC.) - Source: https://appshunter.io/ios/app/signback-sign-pdf-documents/id6779878583 (this page in markdown: same URL + `.md`) - Developer: [Silvergrove Labs LLC](https://appshunter.io/developer/6779878585) - Category: Productivity, Business - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 18.0 · 8 MB - Languages: American English - Released: 2026-07-21 - Data updated: 2026-08-21 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/signback-sign-pdf-documents/id6779878583/reviews.md ## What is SignBack? Stop printing. Stop scanning. Stop turning a simple signature into a whole project. SignBack turns paperwork into a clean signed PDF from your iPhone or iPad. Open a PDF, fill the blanks, sign, and send it back without a SignBack account, subscription, or watermark. Use it for contracts, leases, government forms, waivers, intake forms, vendor paperwork, and everyday PDFs. No account. No server upload for document processing. No watermark on exported PDFs. KEY FEATURES PRIVATE BY DESIGN • Your signing workflow happens on your device. Documents are not uploaded to a SignBack server for opening, filling, signing, converting, or exporting. Nothing leaves until you choose to share the finished file. OPTIONAL iCLOUD SYNC • Keep your Signature Wallet, Signing Identities, Templates, profile name, and folder structure in sync across your own devices through your private iCloud. Sync is off by default, there is no SignBack account, and everything is encrypted on-device before upload. First sync gives you merge, replace, and review options so you stay in control. SMARTER FAST FILL • Fast Fill highlights likely fields on many forms, including signature lines, printed names, dates, initials, emails, phone numbers, addresses, and checkboxes. It now adapts to document complexity with confidence guidance, helping find fields on dense forms like W-9s while avoiding instruction pages and false fill spots. TAP-TO-ADD EDITING • Tap anywhere on a document to quickly add signatures, dates, text, and checkmarks. The redesigned bottom sheet includes identity-aware Quick Fill, inline text editing, floating size controls, and a cleaner color palette so you can finish documents faster without switching screens. SCAN MULTI-PAGE DOCUMENTS • Use your camera to scan paper forms, contracts, notices, receipts, and multi-page documents. Turn pages into a clean PDF you can fill, sign, save, and send back. OPEN MORE THAN PDFs • Open PDFs, Word documents, Pages files, text files, photos, and scans. Supported files convert into clean PDFs on-device so you can finish the paperwork that actually arrives. SIGNING IDENTITIES FOR REAL ROLES • Create saved identities for personal, work, LLC manager, trustee, property manager, agent, and other signing roles. Each identity can fill the right contact details and signature block when needed, and Signing Identities can be protected with Face ID. SIGNATURE WALLET • Draw or type your signature and initials once, then reuse them across documents. Signatures render with natural pen-like ink, smooth strokes, and tapered ends. Optional device authentication can help protect your app and signature wallet. ORGANIZE YOUR PAPERWORK • Save reusable templates for forms you handle often • Organize documents into folders • Use Apartment, Rental, and custom folder categories • Keep separate signing roles and reusable details • Access SignBack from the share sheet, home-screen widget, and Siri Shortcuts SEND BACK A CLEAN PDF • When you are done, Send Back flattens your fields into the document and opens the share sheet. Large PDFs can be compressed while still letting you send the original with iCloud Mail Drop if you prefer. ON-DEVICE DOCUMENT SUMMARIES • On supported devices, SignBack can use Apple Intelligence to summarize a document and surface key points before you sign. Requires compatible hardware, supported system software, Apple Intelligence enabled, and the model available. Summaries may be incomplete and do not replace reading the original document or getting professional advice. ACCESSIBLE PAPERWORK TOOLS • SignBack includes improved VoiceOver support across sync settings, Fast Fill, the PDF editor, folder picker, and identity list. The next time someone says “just sign this and send it back,” do exactly that with SignBack. Free and private by design. Apple Intelligence, Face ID, iCloud, iCloud Drive, iPad, iPhone, and Siri Shortcuts are trademarks of Apple Inc. ## Key features - 100% free access - Secure local processing - Multiple identities - Smart fast fill assistant - Multi-format support - Sign and send back in one tap - Scan paper documents ## Frequently asked questions about SignBack ### 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. ## Version history (last 5 releases) ### 1.1.1 — 2026-08-20 Faster document signing with an improved Fast Fill. Long-press Copy now places the actual PDF on your clipboard, ready to paste into Mail or Messages. Document status now updates automatically when you sign, and you can tap the status pill to change it anytime. ### 1.1.0 — 2026-08-17 SignBack now gives you more control, faster document completion, and better organization across your signing workflow. Sync Across Devices Optional iCloud sync lets you keep your Signature Wallet, Signing Identities, Templates, profile name, and folder structure up to date across your own devices. There’s no account and no SignBack server. Everything is encrypted on-device before upload, sync is off by default, and first sync includes merge, replace, and review options. Smarter Fast Fill Fast Fill now adapts to document complexity with confidence scoring and clearer caution guidance, especially on dense forms like government documents. It finds signature and date fields more reliably while avoiding instruction pages and false positive fill spots. If there’s nothing useful to fill, Fast Fill stays out of the way. Redesigned Tap-to-Add Tap anywhere on a document to open a richer bottom sheet with identity-aware Quick Fill. Add signatures, dates, text, and checkmarks faster without switching screens. More Organization Added Apartment and Rental folder categories, custom folder categories, and Face ID protection for Signing Identities. Sharing & Email Signed documents now include auto-populated email subjects, plus cleaner share text. Accessibility Improved VoiceOver support across sync settings, Fast Fill, the PDF editor, folder picker, and identity list. ### 1.0.8 — 2026-08-11 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. ### 1.0.7 — 2026-08-06 Streamlined document ingestion: share a document to SignBack and it opens the app straight to that file, ready to sign. Updated the Privacy screen with clearer detail and a link to the full policy at signback.io. Other minor bug fixes and improvements. ### 1.0.6 — 2026-08-04 Sign and send documents faster than ever. SignBack packets are now more functional so you can assign and share more easily with other SignBack users. Turn your phone sideways for a full-screen signing surface that gives you more room for a clean, natural signature. Identities are improved with linked signatures and more functionality. Navigate better by swiping through pages anywhere in the app. Enjoy a smoother and cleaner SignBack experience. ## Related topics [document signing free](https://appshunter.io/ios/topics/document-signing-free) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*