NiosPDF: Offline PDF Editor

📄 NiosPDF is an offline PDF viewer AND editor — a complete PDF toolkit that runs on your phone.

No account. No ads. No cloud. Your documents are opened, edited and saved on your device, so the app works in aeroplane mode too. 🔒

Free forever, built by one developer tired of paywalled rotate buttons.

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✨ WHY NIOSPDF

🔒 Works offline — your files stay on your device
🤖 Optional AI assistant that runs on your phone
✏️ A real editor, not just a reader
🚫 No ads, no watermarks on your work
🙅 No account, no email, no sign-up
💜 Free forever — every tool, no paywall
📱 Side-by-side panes on tablets, foldables and DeX

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✏️ EDIT A PDF, PROPERLY

• Tap a line of text and retype it, right where it sits — font, colour, size and angle too
• Add a text box anywhere and drag it into place
• Add, move, resize, replace or remove images
• Draw freehand with five ink colours and an adjustable nib
• Rectangles, ellipses, lines and arrows, filled or outlined
• Highlight, underline, strike through or squiggle any text — or highlight scans freehand
• Sticky notes and comments in one panel
• Redact what should never have been there — removed, not just covered
• Full undo and redo — the original is untouched until you save

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📖 READ ANYTHING, INSTANTLY

• Fast, smooth rendering, even on long documents
• Night mode for reading in the dark
• Read aloud — let your phone narrate the page
• Find any word in a document, or search names and contents across your whole library
• Star the documents you keep coming back to

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🤖 PRIVATE AI ASSISTANT (OPTIONAL)

• Summarise a PDF, or ask it questions — answers cite the page
• Explain or translate selected text, and get smart next-step suggestions
• Smart search finds passages by meaning, and AI can suggest document properties
• Off until you switch it on. Download a model once in Settings (390 MB–4.7 GB) and it runs on your phone; nothing is uploaded
• Or connect your own AI server; the text you ask about then goes to that server
• AI can make mistakes. Check anything important

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✍️ FILL & SIGN

• Draw your signature, type it in a handwriting style or upload an image, and save it to reuse
• Drop it on the page, then drag to move and resize
• Fill in real PDF form fields too
• See whether a signed PDF is intact, and who signed it

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📷 SCAN & RECOGNISE TEXT (OCR)

• Scan paper with the camera — auto edge detection and crop
• On-device text recognition turns a scan into a searchable PDF
• Latin script is built in; Chinese, Devanagari, Japanese and Korean download once, then work offline

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🔄 CONVERT

• PDF → Word (with real paragraphs and headings), Excel, PowerPoint
• PDF → plain text, HTML, Markdown, CSV or page images
• Create a PDF from pictures and documents

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🗂️ ORGANISE & OPTIMISE

• Drag to reorder, rotate, duplicate, crop, resize, extract and delete pages
• Merge many PDFs into one, or split one into pieces
• Compress, watermark or stamp a file
• Compare two files and see what changed
• Batch: compress, convert, rotate or resize many files, then save or share

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🔐 PROTECT

• Lock a file with a password, encrypted with AES-256
• Control what readers may do: printing, copying text, editing, filling forms
• Remove a password from a file you own
• Sanitise a document before you send it

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🤝 ABOUT PRIVACY

At launch, NiosPDF checks Google Play for optional app updates. Internet also serves scanner/OCR modules, chosen AI models and links. No accounts or NiosPDF servers. Documents stay local unless you connect the assistant to your own AI server.

Privacy policy: https://siddharthpattnaik.github.io/legal/niospdf/privacy-android.html

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💜 If NiosPDF saves you a subscription, there's a "buy me a coffee" link in Settings. It is entirely optional — every feature is free either way.