# Interchange - eBook Converter — reader for txt/epub/mobi/pdf

> Ebook converter and reader with extensive format support and customization. (iPhone/iPad app by 小龙 刘.)

- Source: https://appshunter.io/ios/app/interchange-ebook-converter/id1198053063 (this page in markdown: same URL + `.md`)
- Developer: [小龙 刘](https://appshunter.io/developer/1171012527)
- Category: Books, Productivity
- Price: Free with in-app purchases
- Rating: 4.30/5 from 212 App Store ratings · 112 written reviews indexed
- Age rating: 17+
- Requires: iOS 12.2 · 103 MB
- Languages: American English, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2017-01-24
- Data updated: 2026-08-29
- Monetization: subscription
- User reviews in markdown: https://appshunter.io/ios/app/interchange-ebook-converter/id1198053063/reviews.md

## What is Interchange?

Functional Features
1. Supports multiple format conversions: txt, epub, mobi, azw, azw3, prc, pdf, markdown, docx, htmlz, fb2, etc. For txt files, automatically extract chapter directories.
2. Support removing DRM protected book files (Kindle DRM).
3. A comprehensive e-book reader that supports multiple formats: txt epub、mobi、azw、azw3、prc、pdf。 Powerful custom layout layout, including line spacing, paragraph spacing, first line indentation, top and bottom spacing, left and right spacing, custom background, custom font, global progress drag, and global search. Rich note taking and bookmarking functions.
4. Support custom book covers, online search, and album selection, even txt can have beautiful covers. Simultaneously editable, cropped, and filtered.
5. Provide multiple page turning methods, including overlay, translation, simulation, scrolling, automatic scrolling reading, landscape reading, and dual column reading.
6. Supports comic reading, with maximum screen ratio and maximum clarity for reading comics. Support scrolling mode for reading comics.
7. Powerful book management function, supporting grouping, renaming, sorting, dragging and merging groups, batch deletion, and moving operations.
8. Support modifying book element data such as title, author, ASIN, ISBN, time, publisher, etc.
9. Multiple file transfer methods, importing book files through WiFi, computer, Baidu cloud storage, local devices, and other application sharing methods for convenience and ease.
10. Quickly decompress compressed files such as zip, rar, 7z, etc.
11. Password protection function, can set gesture password, facial recognition unlock.
12. There are more features waiting for you to explore.

[Automatic Subscription Instructions]
--Subscription period: 1 month
--Price: ¥ 18
--Subscription auto renewal, unless auto renewal is closed at least 24 hours before the end of the current term.
--Payment will be charged to iTunes account upon confirmation of purchase
--The account will receive renewal fees within 24 hours before the end of the current period, and the renewal fees will be determined
--Subscription can be managed by users themselves, and automatic subscription can be disabled by entering their personal account on the App Store after purchase
--If any unused portion of the free trial period is provided, it will be forfeited upon the user's purchase of the publication's subscription (if applicable)

--Subscription period: 1 year
--Price: ¥ 30
--Subscription auto renewal, unless auto renewal is closed at least 24 hours before the end of the current term
--Payment will be charged to iTunes account upon confirmation of purchase
--The account will receive renewal fees within 24 hours before the end of the current period, and the renewal fees will be determined
--Subscription can be managed by users themselves, and automatic subscription can be disabled by entering their personal account on the App Store after purchase
--If any unused portion of the free trial period is provided, it will be forfeited upon the user's purchase of the publication's subscription (if applicable)

--Service Terms: http://blog.sina.com.cn/s/blog_a02518890102xuoh.html
--Privacy Policy:  http://blog.sina.com.cn/s/blog_a02518890102xtq4.html

## Key features

- Multiple ebook format conversion
- DRM removal for Kindle books
- Customizable ebook reader layout
- Note-taking and bookmarking
- Customizable book covers
- Multiple page-turning methods
- Comic reading support
- Advanced book management

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| UNLOCK ALL FEATURES, REMOVE AD | $2.49 | per month |
| UNLOCK ALL FEATURES, REMOVE AD | $4.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| REMOVE ALL ADS | $1.99 | one-time |
| ALL ACCESS, REMOVING AD | $9.99 | one-time |
| Conversions+50 | $1.99 | one-time |
| Conversions+600 | $2.99 | one-time |
| Conversions+1000 | $3.99 | one-time |
| All formats | $1.99 | one-time |
| All formats | $1.99 | one-time |
| All advanced features | $9.99 | one-time |


## What do users think of Interchange?

Overall sentiment: mixed

**Pros**

- 🚀 Fast and quick conversion speeds
- 👍 Easy to use interface
- 📁 Supports multiple file formats
- 💰 Free version available
- 📧 Can send files to Kindle
- 🎯 Does what it claims to do
- 📱 Works well on mobile devices

**Cons**

- 🐛 Frequent app crashes and crashes on cover changes
- 😤 Intrusive and excessive advertising
- ❌ Poor conversion quality for PDFs
- 🔤 Confusing and non-intuitive UI
- 🌐 Inconsistent English localization
- 📖 Missing or not converting book covers
- 💳 Misleading pricing and subscription issues
- 🚫 Broken ad close buttons
- 📤 Files not syncing to Kindle properly
- 🔧 Poor customer support and refund issues

**Commonly reported bugs**

- App crashes when changing covers
- Ad close buttons are too small or non-functional
- Converted files show as 0 bytes
- App crashes when deleting empty files
- Pro version features still require upgrade prompts
- Converted PDFs have missing images and jumbled text
- Files vanish after sending to Kindle
- Conversion fails despite payment
- App shows ads instead of converting files
- Cover metadata not preserved in conversions
- Right-to-left text displays incorrectly

**Most requested features**

- Batch conversion capability
- Right-to-left text support for Arabic books
- Proper cover image inclusion in conversions
- Unlimited conversions
- iPad Pro landscape orientation support
- Ability to send files to Kindle over WiFi
- Bookmark synchronization across devices
- Better ad implementation with working close buttons

## Recent user reviews (10 of 112)

All indexed reviews: https://appshunter.io/ios/app/interchange-ebook-converter/id1198053063/reviews.md

### 3/5 — 更换闪退！！

*2026-02-04, version 14.4.4*

付了钱的软件居然还那么烂，一换封面就闪退，无论怎么打开，试过关机重启，删掉重新下载都是一样！！太气人了！软件是好软件。但是能不能做好一点呀呀

### 1/5 — The new update

*2024-01-07, version 14.3.0*

What have you done with the latest update??? It won’t change the covers, the whole app is so complicated and confusing now. Please fix it.

### 1/5 — Rubbish…Useless

*2023-03-22, version 13.0*

I tried a pdf to EPUB conversion, and it was terrible. Virtually unreadable. I paid £7.99 for the pro version. I’ve asked for a refund but I’ve yet to receive a response. I clicked on the app support button in the App Store, and it was all in Chinese.

### 5/5 — Okay It As It Lays

*2022-10-20, version 13.0*

Thanks

### 1/5 — Honestly? Feels scammy.

*2022-06-01, version 13.0*

I hate to say it, but after buying a month subscription to take care of a set of files that needed o be converted, I never got access to those files. When I try to view the converted file, I’m prompted to upgrade. Even though I, uh. Already upgraded. This is a flagrant ripoff and I don’t know if it’s shoddy coding or what, but I regret spending the $2 on it.

### 5/5 — Worked where others didn’t

*2022-05-13, version 13.0*

Converted files easy that other apps wouldn’t

### 5/5 — 好用

*2022-02-27, version 13.0*

没广告，特别好用，希望继续保持！

### 1/5 — Extremely poor UI

*2022-01-28, version 13.0*

One of the worst UIs I've had the displeasure of interacting with.

### 5/5 — Love it.

*2021-08-14, version 13.0*

Love this. So easy to use.

### 1/5 — No star deserved

*2021-03-27, version 12.8*

Absolute crap

## Frequently asked questions about Interchange

### What file formats does this app support for conversion and reading?

The app supports a vast array of ebook formats for both conversion and reading, including txt, epub, mobi, azw, azw3, prc, pdf, markdown, docx, htmlz, and fb2. It can also automatically extract chapter directories from txt files.

### Can this app remove DRM protection from ebooks?

Yes, the app is capable of removing DRM protection from Kindle book files. This allows you to read your DRM-protected ebooks on any compatible device or reader.

### How much does the app cost?

The app operates on a subscription model. You can choose between a monthly subscription for ¥18 or an annual subscription for ¥30. Subscriptions auto-renew unless turned off at least 24 hours before the current term ends.

### What are the reading customization options available?

The reader offers powerful customization for your reading experience. This includes adjusting line spacing, paragraph spacing, first line indentation, top/bottom and left/right spacing, custom backgrounds, custom fonts, and global search. It also supports various page-turning methods and comic reading modes.

### How can I import books into the app?

The app provides multiple convenient methods for importing book files. You can import through WiFi, your computer, Baidu cloud storage, local devices, or via other application sharing methods.

## Version history (last 5 releases)

### 14.4.4 — 2024-09-09

1. Fix the issue of reading progress not being saved
2. Fix reading configuration loading error issue
3. Other details adjustments

### 14.4.3 — 2024-09-03

1. Added a dual column mode, allowing you to read e-books just like reading paper books
2. Optimize the chapter directory structure for a more intuitive and convenient operation
3. Optimize the listening logic, listen anytime, listen wherever you want
4. Adjust and optimize other details, fix bugs
5. Change the app icon and name
6. Further updates are currently being planned

### 14.4.2 — 2024-07-23

1. Adjust the indentation of the first line by word count.
2. Convert txt to other formats and support setting the first line indentation.
3. Support uploading custom fonts through WiFi.
4. Optimize scrolling mode and adjust image display logic.
5. Optimize and adjust other details.

### 14.4.1 — 2024-07-10

1. Urgently fix abnormal issues
2. Optimize CSS parsing
3. Complete other details

### 14.4.0 — 2024-07-08

1. A brand new e-book reader with global progress, global drag, global search, and more exquisite layout and layout.
2. Read comic books in full screen.
3. Fix related issues.

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## More apps by 小龙 刘

- [Full Format eBook Converter](https://appshunter.io/ios/app/full-format-ebook-converter/id1184245408)
- [MP3 Converter-Making ringtone](https://appshunter.io/ios/app/mp3-converter-making-ringtone/id1437263307)

All apps by 小龙 刘: https://appshunter.io/developer/1171012527

## Related topics

[ebooks converter](https://appshunter.io/ios/topics/ebooks-converter) · [the ebook converter](https://appshunter.io/ios/topics/the-ebook-converter) · [free ebooks converter](https://appshunter.io/ios/topics/free-ebooks-converter)

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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 2026-08-29.*