PDF Masker vs KlarScan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF Masker
Easily mask sensitive keywords in PDF files before sharing. Import PDFs, specify multiple keywords, and customize redaction colors. Export as text or image-based PDFs for secure data sharing.
- Import PDFs via Share menu
- Bulk keyword redaction
- Export as text or image PDF
- Multiple keyword support
- Customizable redaction color
- Save keyword histories
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Protect your sensitive information before sharing files with others. PDF Masker is a powerful security tool that lets you search and black out specific keywords across your PDF documents automatically. Import any PDF directly from your device using the Share menu. Enter your target keywords, and the app instantly hides matching text so you can send your documents safely. You can choose to export your final file as a searchable text-based PDF or as an image-based PDF. The image-based option is perfect when you want to permanently erase underlying text data so it can never be copied or recovered. Key Features - Smart Bulk Redaction: Enter a keyword and automatically mask every single match across the entire document. - Multiple Keywords Support: Separate multiple terms using spaces or commas to clear different pieces of data at once. - 100 Item History Tracker: Saves up to 100 of your frequently used keywords so you can reapply them with a single tap. - Custom Redaction Colors: Change the color of your redaction blocks from classic blackout to white or any custom tone. - Flexible File Loading: Easily load files from your system file picker, in-app web browser, or straight from other apps via the Share extension. - 100 Percent Offline Security: All processing happens locally on your phone or tablet. Your private and confidential documents are never sent to external servers. - Clean and Fast User Interface: Designed to be clean, fast, and simple for everyone, with no complex setup required. Whether you are hiding account numbers, blurred names, personal addresses, or sensitive corporate contracts, PDF Masker helps you prevent data leaks on the go.
KlarScan
This app transforms paper documents into organized PDFs directly on your device. It offers robust editing, permanent redaction, and searchable text capabilities, all while operating offline without any networking code or sign-ups.
- Offline scanning and editing
- Permanent redaction
- Searchable PDFs with on-device OCR
- Adjustable export quality and size
- Library with full-text search and tagging
- On-device encrypted storage
- iPad optimized with keyboard support
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KlarScan turns paper into tidy PDFs and does the entire job on your iPhone or iPad. The app contains no networking code at all: no account, no cloud, no tracking, nothing to sign up for. Switch the device to airplane mode and everything still works. SCANNING Capture runs through the iOS document camera, so edge detection and automatic capture behave exactly as you know them from the system. From there a four-step assistant leads to the finished PDF: check pages, choose quality, name the file, share. If the defaults suit you, three taps on Continue are enough. EDITING PAGES Reorder pages by dragging, rotate them, rescan a single page, or delete it. Tap a page to zoom deep into it. Undo is available everywhere editing happens. PERMANENT REDACTION Drag to cover an area, then adjust its corners and edges. Slanted shapes work too, which helps with a block of text that was scanned askew. Applying burns the shapes into the pixels of the page. There is no overlay and no PDF annotation with readable content underneath. The original file is deleted, and text recognition runs only afterwards. Redacted content therefore cannot come back in the PDF text or in search. SEE THE SIZE BEFORE YOU EXPORT Three presets (up to 150, 200, or 300 dpi) or your own values for resolution and JPEG quality. The size on screen comes from the same encoder that writes the export, not from a formula, and a before/after preview shows the exact artifacts the PDF will carry. Color, grayscale, and black & white belong to the export and stay changeable at any time. SEARCHABLE PDFS On request, KlarScan recognizes the text with Apple's Vision framework on device and places it invisibly over the image. The file stays small, and the text can be searched and selected in any PDF reader. LIBRARY Every export is saved to the library automatically. Full-text search covers titles, tags, and recognized text. Tags can be assigned, renamed everywhere, and removed everywhere, and several tags narrow the list further. Saved scans stay editable later, because the source pages are kept for exactly that. BACKUP The whole library can be written to a folder of your choice and read back from there: the Files app, iCloud Drive, or an external drive. Inside that folder every document is a plain PDF, readable with any app. ON DEVICE, ENCRYPTED Every file is written into the app's protected container with complete file protection, readable only while the device is unlocked. The camera is the only permission ever requested. There is no access to photos, location, or contacts. IPHONE AND IPAD On iPad the library sits as a sidebar beside the document, with keyboard shortcuts, pointer support, and drag to reorder. Available in 24 languages. PRICING Free to download, seven days to try everything, then a single unlock. One-time purchase, no subscription, no recurring costs. When the trial ends the library stays fully usable: view, search, share, export, delete. The unlock covers new scans and edits. Provider: BYTEPOTATO UG (haftungsbeschränkt)
Screenshots
Verdict
The clearest difference is rating: KlarScan at 5.0 against PDF Masker's 2.0. KlarScan also leads on ads (none vs shown) and update cadence (every 6 days vs monthly). PDF Masker's advantage is monetization model (ad-supported vs freemium) and iOS requirement (15.0 vs 18.0). On price, ratings volume, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. PDF Masker sells 1 one-off in-app purchase and KlarScan sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
KlarScan holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
PDF Masker ships an update monthly, KlarScan every 6 days. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.
| Parameter | PDF Masker | KlarScan |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (1 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Monthly | Every 6 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Ad-supported — better | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 14 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Kazuhisa Kobayashi | BYTEPOTATO UG (haftungsbeschraenkt) |
Customer experience
PDF Masker
KlarScan
In-app purchases
PDF Masker
- Remove Ads$4.99
KlarScan
- 7-day TrialFree
- Full version$3.99









