One home for your files
Find recent documents, search by name, filter by type, and keep favorites close.
Offline-first Android file viewer
Different files. One app to open them.
View PDF, HWP, Word, Excel, PowerPoint, images, archives, and more—quickly and safely, without an account.
✓ No sign-up✓ On-device processing✓ Read-only by design
PDF
HWP
Everyday files, one familiar viewer
PDFHWPWORDEXCELPPTZIPEPUBBuilt for the moment you need a file
Open more. Wait less.
A lightweight, honest viewer focused on helping you get to the content—not making you learn another office suite.
Useful previews
Read PDFs, images and text, or safely preview content from HWP and Office documents.
Designed for every screen
A responsive layout feels at home on phones, foldables, and tablets.
Safe by default
OpenOne never edits originals or runs macros, scripts, or APK installation code.
Privacy is not a setting
Your documents stay yours.
Documents continue to be processed on your device. The app may use internet access and an advertising ID for ad delivery and measurement, but document contents are never sent to the advertising service.
See the full privacy policyOnly what you choose
Android’s system picker gives the app access only to files and folders you explicitly select.
Local processing
Previews, recent-file history, favorites, and reading position are handled on your device.
Originals stay intact
The viewer is read-only and does not modify the source document.
A clear path from file to answer
Made to get out of your way
01
Choose a file
Open a file from OpenOne, a message, email, or Android’s share menu.
02
Read with confidence
Zoom PDFs and images, browse tables, or extract readable document content safely.
03
Pick up where you left off
Return to recent files, favorites, and your saved reading position.
Your next file needs only one app.
Open the documents you meet every day with OpenOne for Android.
Get OpenOne on Google Play