Ninja Scan

Document & business-card scanner for Android

Scan everything.
Private, confidential, secure.

Ninja Scan is the organizer for all your important documents and business cards, kept in one private, safe place. It captures them, reads the text, and keeps every byte on your phone unless you decide otherwise — no ads, no analytics, no watermark, no account required. Totally free, with every feature included.

  • No watermark on your files — ever
  • Auto backup & restore to your own Google Drive
  • On-device OCR — text never leaves your phone
  • No ads, no analytics, no third-party trackers
  • No account required to use the app
  • Free, with every feature included

edge detect → crop → OCR → done

Document scanning

From paper pile to searchable library

Point the camera at a document and it's cropped, cleaned up, and made fully searchable — automatically.

Capture

Edges locked on before you tap the shutter

Live edge detection tracks the page in real time as you frame the shot, so the crop is already right before you capture — no fiddling with corners after the fact. Auto capture fires the moment the page is steady and in frame; manual mode is there if you want more control.

Live edge detection while scanning a document

View

Read scans without leaving the app

Every document opens in a built-in PDF viewer, so you can read, zoom, and flip through pages without handing the file off to another app. Jump straight into watermarking, adding more scanned pages, sharing, or editing from the same screen.

Built-in PDF viewer for a scanned document

Export

Export as PDF, images, or a long image

Share the whole document or just the pages you pick — as a single PDF, per-page images, one tall long image, or separate PDFs for each page. Export straight into Google Drive, WhatsApp, or any app through Android's own share sheet.

Share sheet with PDF, image, and export options

Capture

Every page, cropped straight and read on the spot

Point the camera at a document and edges are detected, corrected, and cleaned up automatically — shadows and stains removed, up to 50 pages per scan. Every page is run through on-device text recognition the moment it saves, so search finds a document by what's actually written on it, not just its title.

Folders keep the library organized — add, rename, or delete them any time, and filter by tapping a chip.

Ninja Scan document library with folders and full-text search

Clean up

Long-press, select, gone

Select several documents at once and share or delete them together in one action — no tapping through each one individually. The same long-press opens rename and delete on a folder chip, reliably, every time.

Multi-select mode with mass delete

Protect

A watermark that isn't stuck to the file

Add an optional diagonal watermark and it's stamped on the fly whenever the document is viewed, shared, or exported — the stored file itself stays clean, and the watermark stays editable, or removable, at any time. Turn on Drive backup and scans and contacts upload automatically through Google's narrowest Drive permission — the app can only ever see files it created itself.

Page editor with an editable diagonal watermark

Business card scanning

From a card in your hand to a contact you can use

Point the camera at a card and get a real, searchable contact — name, company, phone, and email, extracted automatically.

Capture

Same capture flow for cards

Scanning a business card uses the exact same live edge detection and auto-capture as documents, so there's nothing new to learn — point, hold steady, and the card is captured and read automatically.

Live capture while scanning a business card

Organize

Business cards, tagged like they deserve to be

Scanning a card extracts the name, company, title, phone, email, and address on-device — layout-aware, so a name and job title printed side by side don't get run together. Label contacts with reusable, colored tags — Client, Vendor, Follow-up, whatever fits — create, rename, recolor, or delete a tag any time, and search finds contacts by tag too.

Business card tag editor with colored tags

Use

Reach out without leaving the card

Every extracted field is tappable — call or WhatsApp the number, email straight from the card, open the website, or drop a pin on the address in Maps. No copying and pasting into another app first.

Business card detail screen with call, WhatsApp, email, website, and maps actions

Export

A contact you can actually use, not just a photo

Save a card straight to your phone's real Contacts app in one tap, tags included, or export your whole list as a CSV or a genuine Excel workbook — the data travels with you, not just an image of a card.

Business card list with saved contacts

Why switch

Built different from the free scanner apps you've already tried

Most "free" scanner apps make their money back somewhere — usually ads, a forced watermark, or export formats locked behind a subscription. Here's where Ninja Scan lands on the things that actually matter.

Ninja Scan Typical free scanner apps
Price Free, every feature included Free tier, paywall for real use
Ads None Yes, usually
Watermark on exports Optional, and removable anytime Forced on free exports
Business card scanner Built in, with Contacts export Rare, or a separate app
Text recognition On-device, works offline Often sent to a server
Cloud backup Your own Google Drive, narrowest scope Vendor's own cloud, broad access
Account required No, except to turn on backup Usually, from the first launch

More reasons to switch

The details a quick scan doesn't show

Small workflow choices that add up once you're actually using it every day.

Full-resolution originals, always kept

The optimized PDF is what you view and share, but the full camera-resolution original stays on your phone too — so a later edit never has to work from lossy data.

Export any way you like

Share the whole document or just the pages you pick, as a PDF, per-page images, one long image, or separate PDFs — the choice is yours every time.

Straight into your Contacts

Save a scanned business card to your phone's real Contacts app in one tap, tags included, instead of leaving it stuck inside another app.

CSV and Excel, not just an image

Export your whole card list as a CSV or a real .xlsx workbook — the data comes with you, not just a photo of a card.

Built for bulk, not one at a time

Long-press to select several documents or cards at once, then share or delete them together instead of tapping through each one.

Folders and colored tags

Organize documents into folders and label contacts with reusable, colored tags — create, rename, recolor, or delete any of them whenever you like.

One place, safely kept

All your documents, in one safe place — your own Google Drive

Every scan and business card lives in Ninja Scan's private library, right there on your phone. Turn on backup and everything mirrors into a folder in your own Google Drive — never a stranger's server, never anyone else's cloud. No ad network, no analytics SDK, no third-party tracker of any kind.

ON-DEVICE

Document and card text recognition happen locally, through ML Kit's on-device APIs — nothing is uploaded to recognize a word.

YOUR OWN DRIVE

Backup is off by default. Turn it on and copies go straight to a folder in your own Google Drive, scoped to drive.file — the app can never see the rest of it.

YOURS TO DELETE

Delete a scan or contact any time in-app; uninstalling removes everything local with it.

Built to be forgotten by everyone except you.

Ninja Scan is in closed testing on Google Play. Join the tester list to get access.