JianBox - Local Document Tool
Scan, sign, lock. No subs.
Free · Designed for iPad. Not verified for macOS.
All-in-one office toolkit with 12 tools. 100% offline processing, zero cloud upload. Includes document scanner, PDF editor, file unarchiver, and private vault.
JianBox = Document Scanner + PDF Editor + File Unarchiver + Private Vault, all in one.
100% Local Processing. Your files never leave your device.
One app, twelve capabilities, zero cloud uploads, zero account login required. Scan documents, convert formats, edit PDFs, extract archives, free up storage, encrypt files—everything happens offline on your iPhone and iPad.
Documents & Scanning
【Camera Scanner】
Snap photos or import from album. Auto edge detection, enhancement, multi-page scanning, export as PDF. Contracts, receipts, notes, IDs—turn them into high-quality PDFs instantly.
【Image to PDF】
Select multiple images and merge them into a single PDF. Custom page sizes (A4/Letter), watermark support. Fully offline.
【PDF Editor】
Reorder, rotate, delete, or extract PDF pages with simple drag-and-drop gestures.
【PDF Verifier】
Professional PDF inspection tool: page consistency check, blank page detection, metadata viewer, SHA-256 hash verification. Auto-generates verification reports for compliance scenarios.
【Signature Tool】
Place personal signatures or company stamps on PDFs. Drag-and-drop positioning, resize, rotate, batch signing across multiple files. Final step for contract approval and formal delivery.
Files & Compression
【HEIC Converter】
Batch convert iPhone HEIC/HEIF photos to universal JPG format. Adjustable quality and dimensions, text or image watermark support. Solves the "Windows can't open iPhone photos" problem.
【Unarchiver】
Extract ZIP, RAR, 7Z, TAR, GZIP, BZIP2, XZ. Also create password-protected ZIP archives from multiple files. Open compressed attachments directly without a computer.
【Batch Renamer】
Rename files or photos with prefix, suffix, numbering, find-replace, timestamps. Preview before applying, undo support.
【Storage Cleaner】
Scan large files, duplicate photos, and app caches. Free up space with one tap.
Media Processing
【Video & Audio Toolkit】
Convert formats, compress files, trim videos, extract audio tracks. All processing happens locally with zero data usage.
Privacy & Security
【Private Vault】
Encrypt and store sensitive files and photos. Face ID / Touch ID locked. Bank-level encryption protects your data even if your phone is lost.
Productivity Tools
【Clipboard History】
Automatically saves copied text. Pin important items, search history, categorize. Never lose a copied verification code or address again.
【QR Scanner & Generator】
Scan QR codes and barcodes, or generate custom QR codes. History auto-saved for easy reference.
Key Features
• 100% Offline — Files stay on your device, never uploaded
• 12-in-1 Toolkit — Replace 12 separate apps, save storage
• Clean and Tidy — Clean, distraction-free interface
• iPad Optimized — Full-screen support, split-view ready
• Multi-Language — English, Chinese, Japanese, Korean
Privacy & Security
JianBox respects your privacy. All file processing occurs entirely on your device. We do not collect, upload, or store any of your file contents. The Private Vault uses device-level encryption.
No account sign-up required. No usage tracking. No marketing notifications.
Pro Version
One-time purchase. iPhone + iPad universal. Lifetime access to all 12 tools. No subscription, no recurring fees, no account binding. Future updates included forever.
Questions or feedback? Contact us through the in-app support feature.
Ratings & Reviews
New Features
1. Brand-new credits system: watch a short ad to earn 2 credits, and spend 1 credit per tool action - one generation, one conversion or one export each counts as one
2. Credits work across every tool: credits earned while signing a document can be used right away for PDF conversion
3. New users get 5 credits: they are available as soon as you open the app
4. Credit balance in the top bar: a credit icon with your balance sits next to the language switcher - tap it to see what you earned and spent
5. Transparent credit usage: every tool action costs 1 credit, with balance, totals and history always visible
6. Top up in one tap: tap "Watch ad +2" and the credits are added instantly, then your action continues
7. Credits never expire: whatever you earn stays available
Changes
1. Membership subscriptions are gone: there are no more in-app purchases, JianBox is completely free
2. Splash ads are back: a splash ad may appear at launch, and only after you agree to the privacy policy - declining still leaves every feature fully available
3. All limits are gone: scanned exports no longer add a watermark, and the count limits on the stamp library and batch renaming are fully removed
4. Better permission guidance: when photo or tracking access is restricted, you can jump straight to system settings from inside the app
5. Privacy note updated: all file processing still happens locally on your device and files are never uploaded; ads and usage statistics collect device identifiers for ad serving and usage analytics
Others
1. Continued interface and stability improvements, plus several small fixes
2. Everything introduced in 1.5 is still here - the rebuilt signature editor, the upgraded Files cabinet and iPad support
All file processing happens entirely on your device. Files are never uploaded. Credits are only usable to unlock features inside this app, cannot be exchanged for cash, transferred or cashed out, and can only be earned by watching ads.
The developer, 涛 刘, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 涛 刘
- Size
- 52.7 MB
- Category
- Productivity
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - iPad
Requires iPadOS 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 Simplified Chinese
- Age Rating
4+
- 4+
- Copyright
- Copyright © 2026 PrismTao. All rights reserved.
