Kindle Fire: How to display .mobi files as books and not documents

Posted January 6, 2012 by Rob Rogers in Android

At some point you will run into the situation where you have transferred an ebook in .mobi format to your Kindle Fire and it is displayed as a document instead of a book. This creates an inconvenience since now your books are in two locations instead of just one. Here is how to make your .mobi files be registered as books on the device.

The issue that is causing the device to register your .mobi file as a document rather than a book is that there was a personal doc tag (PDOC) placed in the .mobi file during conversion. This tag needs to be removed by reconverting the book without the problematic PDOC.

1. Connect your Kindle Fire to your computer and move the desired .mobi file(s) from the device to your computer.

2. To perform the conversion on your .mobi file, you will need to download and install Calibre which is a free and powerful ebook management system for Windows, OS X, and Linux.

3. Once the software is installed, launch Calibre.

4. Go to the top of the application and select Add books.

5. Browse to the location of the .mobi file you wish to fix, select the file and click the Open button.

6. Once the file has been imported into your Calibre Library, select the file and click the Convert books button at the top of the screen.

7. When the Convert window appears, go to the upper-right and change the Output format to MOBI using the dropdown button.

8. In the left pane, select MOBI Output.

9. In the right pane, under Kindle options, go to Personal Doc tag and delete the [PDOC] that is in the associated textbox.

10. Click the OK button.

The book will go through the conversion process. Once finished, you can move the new file to your Kindle Fire and it will now be recognized as a Book instead of a Document. If you are unsure of where Calibre saved the new file, find the desired book in Calibre’s list on its main screen and right-click on the desired book, then select Open containing folder.


About Rob Rogers

Once a prolific author here on Tech-Recipes, Rob has moved on to greener pastures.
View more articles by Rob Rogers

The Conversation

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  • Jim

    The Fire doesn’t show up as a drive (or folder) on my MacBook Pro, so there’s no way to move the file.

    I’d have to get a copy to my Mac, run it through Calibre without the PDOC tag, and then email it to myself…I *think*. Although so far anything I’ve emailed, no matter what the format, ends up in downloads (using a file app on the Fire…that doesn’t have a way of moving files between folders).

    How do you get the Fire to appear in finder in the first place?

    • Caitlin

      > I downloaded Android File Transfer ( and then you can drag and drop to the Books or Document folders when connected by USB

  • Dara Mahon

    Thank you, this worked a treat.

  • Brenda

    Thanks for the ste-by-step. Worked perfectly!

  • cesar

    Wow, you’re a genius!!!! You’re the only one that could solve this problem after hours of frustrating searching. Thank you very very much!!!

  • Allison

    thank you thank you thank you.

    thank you.

  • Derek

    Sorry but doesnt work?

  • Minahil

    sorry but its still coming under docs!

  • Kate

    it’s not working! does anyone know why?

  • Pendergast

    I think it’s because of the wifi transfer. All document (not bought books) sent using wifi will be presented as documents although you have made this trick. You have to use the usb cable.

  • Pamela L

    Does not work for me either using Kindle app or when emailing to kindle user

  • Br0ther$

    Excellent instructions – many thanks!

  • Ozum

    I was trying to solve this problem on my Kindle Paper White. Unfortunately it didn’t work, it still shows them as “personal” and not as books…

  • Michelle

    this was VERY helpful and worked amazingly THANK YOU 🙂 …however, I used it to convert 500 books (took all night lol) and Calibre saved the original file (original_mobi) AND the new one (.mobi) to the individual author’s folders. I want to now transfer the new files to my kindle into the book folder but how can I easily do this with 500 books? if I do a copy, drag and drop, it will copy both versions. Is there a way to save all the new files to a separate folder and do the transfer from there? I have over 1500 MORE files Id like to convert as well. In Calibre, the files are separated from original and new, but Im not that familiar with the program and dont want to get slap-happy with the buttons 🙂

  • Ramon Somoza

    Thanks for the tip. I was using Calibre to make the conversion into MOBI, and it did not work properly, until I applied your suggestion. Thanks!

  • Agnieszka

    Thank you! It works great 🙂

  • Tom

    does not work

  • Amazon has changed things. It is no longer sufficient to just delete the [PDOC] tag. You must replace it with the [EBOK] tag (exactly as shown, with brackets).

  • Rhonda

    I followed your instructions and converted the file without the PDOC tag and the book still goes to my Documents folder. The only variation to your instructions is that I email the converted file to my Kindle/Kindle App. Any suggestions?

  • Dim

    this does not work when i sent by mail to Amazon cloud library

  • Mary Lou

    Genius! Thanks. It’s so much nicer having my books in one place!

  • Taylor

    Now I don’t have the cover photo?

  • Wzaman

    I can’t understand what I have to do making kindle after converted to .mobi file.

  • Jonas

    Hi, I would like to do this with a book on my kindle that already includes a bunch of highlights and notes. Do you know if the conversion as explained in the article will delete my already existing notes?