OpenOne: File Viewer
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10+
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About this app
Different files. One app to open them.
OpenOne is an offline-first file viewer for Android that helps you safely view many file formats in one place. No account or sign-in is required, and the app can access only the files and folders you select.
Key features
• View PDF pages, zoom in, and move between pages
• Scan a paper document with your camera and save it as a PDF
• Convert multiple images into a multi-page PDF
• Preview paragraphs and tables from HWP and HWPX files
• Preview content from Word, Excel, and PowerPoint documents
• Browse Excel data in a row-and-column grid with horizontal scrolling
• Zoom into JPG, PNG, GIF, WEBP, and other images
• Read TXT, Markdown, HTML, XML, JSON, CSV, and many other text formats
• Inspect file lists inside ZIP and other archive formats
• Preview readable content from EPUB and other eBook formats
• Find recent files with Continue Reading, search, type filters, and favorites
• Use responsive layouts designed for phones, foldables, and tablets
• View file details, share a file, or open it in another app
Privacy first
OpenOne does not require an account to read your documents. File processing happens on your device, and documents are not uploaded to a server without your permission. The app uses Android's system file picker, so it reads only the files and folders you explicitly choose.
Safe, read-only previews
OpenOne does not modify your original files. It does not run macros, PDF JavaScript, HTML scripts, or APK installation code. When a dedicated renderer is unavailable, OpenOne shows readable text, tables, internal entries, or file information and provides an option to continue in another compatible app.
Some legacy Office files and specialized formats may not reproduce the original layout exactly. In those cases, OpenOne focuses on displaying content that can be extracted safely.
OpenOne is an offline-first file viewer for Android that helps you safely view many file formats in one place. No account or sign-in is required, and the app can access only the files and folders you select.
Key features
• View PDF pages, zoom in, and move between pages
• Scan a paper document with your camera and save it as a PDF
• Convert multiple images into a multi-page PDF
• Preview paragraphs and tables from HWP and HWPX files
• Preview content from Word, Excel, and PowerPoint documents
• Browse Excel data in a row-and-column grid with horizontal scrolling
• Zoom into JPG, PNG, GIF, WEBP, and other images
• Read TXT, Markdown, HTML, XML, JSON, CSV, and many other text formats
• Inspect file lists inside ZIP and other archive formats
• Preview readable content from EPUB and other eBook formats
• Find recent files with Continue Reading, search, type filters, and favorites
• Use responsive layouts designed for phones, foldables, and tablets
• View file details, share a file, or open it in another app
Privacy first
OpenOne does not require an account to read your documents. File processing happens on your device, and documents are not uploaded to a server without your permission. The app uses Android's system file picker, so it reads only the files and folders you explicitly choose.
Safe, read-only previews
OpenOne does not modify your original files. It does not run macros, PDF JavaScript, HTML scripts, or APK installation code. When a dedicated renderer is unavailable, OpenOne shows readable text, tables, internal entries, or file information and provides an option to continue in another compatible app.
Some legacy Office files and specialized formats may not reproduce the original layout exactly. In those cases, OpenOne focuses on displaying content that can be extracted safely.
Open PDF, HWP, Word, Excel, PowerPoint, images, and more in one viewer.
Updated on
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Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- This app may share these data types with third partiesLocation and Device or other IDs
- No data collectedLearn more about how developers declare collection
- Data isn’t encrypted
- Data can’t be deleted
What’s new
• Improved PDF merging, page organization, and image export screens.
• Updated batch settings and the PRO purchase and restore screens.
• Added ads to the free version. PRO removes all ads.
• Improved layouts for large text, tablets, and landscape mode.
• Updated batch settings and the PRO purchase and restore screens.
• Added ads to the free version. PRO removes all ads.
• Improved layouts for large text, tablets, and landscape mode.
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About the developer
김미정
mjbelieveis@gmail.com
진산로 90
512동 901호
수지구, 용인시, 경기도 16923
South Korea
