# FileOpen Viewer

> View FileOpen-secured PDF and OPN documents on iOS devices. (iPhone/iPad app by FileOpen Systems Inc..)

- Source: https://appshunter.io/ios/app/fileopen-viewer/id520287055 (this page in markdown: same URL + `.md`)
- Developer: [FileOpen Systems Inc.](https://appshunter.io/developer/520287058)
- Category: Business
- Price: Free
- Rating: 1.03/5 from 35 App Store ratings · 40 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 26 MB
- Languages: Czech, Danish, Dutch, English, French, German, Hebrew, Italian, Japanese, Korean and 9 more
- Released: 2012-05-22
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/fileopen-viewer/id520287055/reviews.md

## What is FileOpen Viewer?

The FileOpen Viewer enables authorized users to access documents secured by FileOpen document security and rights management solutions. FileOpen Viewer supports PDF or OPN file formats opened on an iPad, iPhone or iPod touch. Content owners may require that devices be registered or authenticated, and may impose limits on the number of devices allowed.  Please contact the document owner or publisher for specific instructions or support.

## Key features

- Access FileOpen secured documents
- Supports PDF and OPN formats
- iOS device compatibility
- Device registration and limits
- Rights management

## Recent user reviews (10 of 40)

All indexed reviews: https://appshunter.io/ios/app/fileopen-viewer/id520287055/reviews.md

### 1/5 — Worst App

*2022-11-23, version 2.4.6*

This is by far the worst adaptation ever to IOS, instead of letting me open an encrypted pdf in acrobat or similar, it tried to be a pdf reader and fall way short, it takes ages to open a document, its missing key features and basically its impossible to work with documents having more than 2 pages.

Review should be zero stars.

### 1/5 — Try anything else

*2022-09-08, version 2.4.6*

Painfully slow, your files will get opened but it’s a hassle each time.

### 1/5 — Useless

*2022-05-31, version 2.4.6*

It doesn’t open files. It doesn’t let you view files. Apple should remove this app from the store.

### 1/5 — Worst ever

*2022-04-26, version 2.4.6*

No instructions what so ever. Useless.

### 1/5 — Useless junk

*2022-02-13, version 2.4.6*

Exactly what the person said. 500 page file takes 17min every time you need it. Unbelievably slow. Junk

### 1/5 — Useless app

*2022-01-07, version 2.4.6*

You would think since there is a “local” tab in the app you could pick a file saved to the files app on iOS.  This app was put together by someone who doesn’t know how iPhone apps should be made.  

Don’t bother.

### 1/5 — Just horrible!

*2021-12-29, version 2.4.6*

So horrible! Now most of my pdfs don't open or authenticate.

### 1/5 — Absolute garbage.

*2021-11-10, version 2.4.6*

I would give it zero stars if I could. Takes ages to decrypt files if you can even make it that far. Not only that, you have to decrypt the file every time you open it and if your device enters sleep mode or your autorotate activates? Forget about it. Doesn’t run in the background, either. And now I’m getting “server timeout” errors on files I’ve opened dozens of times so this app is effectively useless to me. I love the mastersofanatomy ebooks and this app is required to open them but it’s not worth the headache.

### 1/5 — Remove this app from the store

*2021-04-25, version 2.4.6*

Apple, please review this app and remove

### 1/5 — Unusable

*2021-01-07, version 2.4.6*

The app takes forever to decrypt the file and the file only remains decrypted while the file is open. If you close the file to try then reopen the same file, you have to decrypt the whole file over again.  As other have said , the decryption is horribly slow. I shouldn’t have to wait and decrypt a file again if I had it open previously. Worst copy protection ever.

## Frequently asked questions about FileOpen Viewer

### What does FileOpen Viewer do?

The FileOpen Viewer allows authorized users to open and view documents that have been secured using FileOpen's document security and rights management solutions. It ensures that only intended recipients can access the content and respects any restrictions set by the document owner.

### What file formats does FileOpen Viewer support?

FileOpen Viewer primarily supports PDF and OPN file formats. These are the formats used by FileOpen's security solutions to protect documents.

### Is FileOpen Viewer free to use?

Based on the provided information, the FileOpen Viewer is a free application to download and use. There are no mentions of in-app purchases or subscription fees for the viewer itself.

### What devices is FileOpen Viewer compatible with?

FileOpen Viewer is designed for use on Apple iOS devices, specifically iPads, iPhones, and iPod touches. Ensure your device is running a compatible version of iOS.

### Can I share documents opened with FileOpen Viewer?

The ability to share documents opened with FileOpen Viewer depends on the rights management settings applied by the document owner. Content owners can impose limits on device registration, authentication, and the number of devices allowed, which may restrict sharing capabilities.

## Version history (last 1 release)

### 2.4.6 — 2017-11-05

This app has been updated by Apple to display the Apple Watch app icon.

- update for iOS 11
- fixed custom error messages

One of the last updates before we release a completely new app.

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## More apps by FileOpen Systems Inc.

- [FileOpen PDF Viewer](https://appshunter.io/ios/app/fileopen-pdf-viewer/id1645208749)

All apps by FileOpen Systems Inc.: https://appshunter.io/developer/520287058

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*