DocMaster AI: PDF Maker & Scan

Resize a photo or signature to the size in KB an exam or job form asks for — 20–50 KB photos, 10–20 KB signatures, passport size or any pixels you type. DocMaster is also a PDF reader, document scanner and file manager in one free app. Read PDF files, scan documents to PDF, convert images to PDF (JPG to PDF), merge, split and compress PDFs, and open Word, Excel and PowerPoint files — all on your phone. Ask AI for a summary, key points or a translation of any PDF. No account, no cloud sync; free and ad-supported.

ASK AI ABOUT ANY PDF
• Summary, key points, a simple explanation, a translation, or your own question
• On phones with Gemini Nano, the AI runs on your phone: offline, and the PDF's text stays on it
• On other phones, your question and the PDF's text open in your own Gemini app (or another app you pick), with your Google account
• AI can make mistakes: check important details

EDIT PDF
• Tap any line of text in a PDF and change it — in the PDF's own font when it has the letters
• Add text anywhere, add a photo or your signature, move and resize them, delete what you don't need
• Undo and redo; saves a new copy, the original stays as it was

VOICE NOTES — RECORD & SUMMARIZE
• Speak and it is written down: lectures, meetings, notes to self
• English, Hindi, Gujarati, Marathi, Bengali, Tamil, Telugu and more
• Copy, share, save as text or PDF, or ask AI for a summary

PRINT
• Print PDFs, photos and fresh scans on any printer your phone can reach
• Several files at once, 1, 2 or 4 pages a sheet, A4 or Letter

APP LOCK & LOCKED FOLDER
• Lock DocMaster with your fingerprint or screen lock
• Keep private files in a locked folder, hidden from the gallery and other apps

PHOTO & SIGNATURE FOR FORMS
• Resize a photo to 20–50 KB, under 100 KB or under 200 KB
• Resize a signature to 10–20 KB or under 50 KB
• Exact pixels: 200 × 230, 140 × 60, passport 413 × 531, or your own
• Never over the limit, and brought up to the minimum when a form asks for one
• Works offline; share the result straight to the form

FILE MANAGER
• Browse your whole device storage as one tree — sort, show hidden files, refresh
• Multi-select with breadcrumbs; copy, move, rename and delete with a paste bar
• Recents and Favorites that follow your files when you move or rename them
• Browse by type — PDF, Word, Excel, images and more — and search every file by name

PDF TOOLS
• Merge several PDFs into one
• Split or extract a page range
• Rotate, compress and add a text watermark
• Password-protect (encrypt) a PDF, or stamp a signature image
• Share and print

SCAN & OCR (on-device)
• Scan documents with the camera — edge detection, multi-page, save to PDF
• Scan ID cards
• Extract text from images with on-device OCR (Latin and Devanagari scripts)
• Select text right on the image, then copy, translate or share

VIEW DOCUMENTS
• Read PDFs with scroll, zoom, search, bookmarks and a thumbnail grid
• Open Word, Excel and PowerPoint files in-app
• View images with pinch-to-zoom

CONVERT
• Images to PDF, and PDF pages to images
• Convert and compress images
• Extract a PDF's text into a Word (.docx) file

MORE TOOLS
• QR scanner and QR code generator
• Calculator, unit converter, storage analyser, duplicate finder

YOUR DOCUMENTS STAY ON YOUR DEVICE
• Your files, scans, photos and recognised text are processed on your device and are never uploaded by DocMaster — no account, no cloud sync. Ask AI hands a PDF's text to your Gemini app only when you ask.
• OCR, document scanning, translation and PDF editing all run on-device.
• DocMaster is free and ad-supported: it shows ads (Google AdMob) and uses analytics (Google Analytics for Firebase) to run and improve the app. These collect usage data and an advertising ID — never your documents. See the privacy policy.

Note: DocMaster requests "All files access" so it can work as a real file manager across your whole storage. You can decline — it then falls back to the system folder picker for opening individual documents.

Recent changes:
New: Offline AI. Phones without Google's built-in Gemini Nano can download a free AI once (0.6 to 2 GB, matched to your phone's memory). Then summaries, answers and translations of your PDFs come on the phone, without internet, and your files stay on your phone. Settings > Ask AI shows what your phone can run and why. Fixes and improvements.