Proofing Your Books | Vellum Help

Proofing Your Books

Before you publish, we recommend proofing your book to ensure that everything looks as you expect.

Proofing for Print

You can use your Mac’s built-in Preview application to review your Print Edition by double-clicking the generated PDF. If everything looks as you expect, you’re ready to upload!


In the Preview application, you can use View ▸ Two Pages to view your pages side-by-side as spreads.

Proofing Ebooks on the Desktop

The easiest way to proof an ebook generated by Vellum is with a desktop reading app.

iBooks for Mac

The iBooks app is installed on any Mac that can run Vellum. Use it to open the iBooks.epub file generated by Vellum.

Kindle Previewer

Kindle Previewer is a free download available from Amazon. Use it to open the file generated by Vellum.

Adobe Digital Editions

To proof your Nook ebooks, use Adobe Digital Editions, which uses the same technology as Nook devices and can open the Nook.epub file generated by Vellum.

Because both iBooks and Nook both use the epub suffix, you may need to use the File > Open With menu item to open with Adobe Digital Editions instead of iBooks:

Note 1: The link above points to the 2.0 version of Adobe Digital Editions. This is not the most recent version, but it best approximates the capabilities of a Nook device.

Note 2: We only recommend using Adobe Digital Editions with the Nook version of your ebook. Other versions will not open successfully.


The Kobo Desktop App is available for free from their website. Use it to open the Kobo.kepub.epub file generated by Vellum.

To open your Kobo book in the app, however, you’ll first have to copy it to the Digital Editions folder located inside your Documents folder. If you don’t already have a Digital Editionsfolder, you can create one using the Finder’s File > New Folder menu item.

Once your ebook is in the proper location, go to the Library tab in the Kobo application. If you already have ebooks in your Kobo Library, click the List View icon in the upper-right corner so that your new one will be easier to find:

Now, press ⌘-Shift-S to refresh your Kobo library and you'll see your ebook appear.

To proof your ebook, simply double-click the book icon.

Google Play

While Google doesn’t offer a dedicated application to proof your books for Google Play, you can use the free Google Chrome web browser.

First, sign into Google Play using Chrome. Then press the Upload files button in the upper-right and select your Play.epub file. After your book is successfully uploaded, you’ll be able to view it from within Chrome.

In fact, once your ebook is uploaded, it will be available from the Google Play app on other devices as well.

iPhones and iPads

To view your ebook on your iPhone or iPad, you will first need to install the appropriate reading app. You can then transfer your ebook to your iOS device.

iBooks, Kobo, Nook, and Google Play
To view your ebook in these iOS applications, you can either email the file to yourself (and then open it using the corresponding application), or you can transfer it using Dropbox.
In order to maintain the formatting in your file, you must follow a specialized procedure to transfer your Kindle ebook to iOS.

Transferring an Ebook to iOS using Dropbox

To complete this procedure, you will need Dropbox installed on both your Mac and on your iPhone or iPad. And while this example is uses the file that Vellum creates for iBooks, the process for transferring to the Kobo or Google Play iOS applications is extremely similar.

  1. In Vellum’s Generate sheet, select a folder within your Dropbox as the destination Folder.
  2. Generate your books.
  3. Now switch to your iOS device and open the Dropbox app.
  4. Find the folder you designated for book generation and open it.
  5. Select an ebook file that was generated by Vellum. For this example, we’ll use the iBooks.epub file.
  6. Dropbox will download the file, but won’t be able to preview it. Touch the button with the ellipsis in the upper-right corner:
  7. Select Export.
  8. Touch Open In...
  9. Touch Copy to iBooks.
  10. Once the iBooks app opens, it should display your ebook.

Transferring a Kindle Ebook to iOS

While it’s possible to use Dropbox to transfer a Kindle ebook to an iPhone or iPad, doing so will not retain all of the advanced formatting applied by Vellum (see also: Kindle Formats). Unfortunately, preserving this formatting when testing requires a complicated conversion and transfer process. To transfer to iOS you will need:

Part 1: Create an .azk file

First, you will use the Kindle Previewer app to generate a special .azk version of your ebook:

  1. Launch Kindle Previewer and open the .mobi file generated by Vellum.
  2. In Kindle Previewer, select File > Export.
  3. Choose a name and location for your exported file.
  4. Select Books(*.azk) from the File Format menu.
  5. When you press Export, Kindle Previewer will convert your .mobi to an .azk file. This process may take a few minutes.
Part 2: Transfer the .azk file to your iPhone or iPad

The only way to transfer this file to your iOS device is via iTunes:

  1. Plug your iPhone or iPad into your Mac and open iTunes.
  2. Click on the device button to view the contents of your iPhone or iPad:
  3. Select File Sharing and then choose the Kindle app:
  4. Find the .azk file generated by Kindle Previewer and drag it into the Kindle Documents pane. Sometimes — even with a successful transfer — the file will disappear from the listing in iTunes shortly after you drop it.
  5. Open the Kindle app on your iPhone or iPad. You should find your ebook in your Library, in the Device tab.

Note: This azk file should only be used for testing. When you’re ready to publish, you will still upload the .mobi file generated by Vellum to Amazon.

eInk Devices

To view on a dedicated eInk reader, you will need to transfer your ebook to the device using a micro-USB cable (this is the same cable you use to charge your device). For this example, we’ll assume you are using a Kindle, though the process is similar for other eInk devices, like the Nook Glowlight or the Kobo Touch.

  1. Connect the small end of the micro-USB cable to your eReader, and the large end to one of the free USB ports on your Mac.
  2. With your eReader successfully connected, you should see it in the sidebar of the Finder:
  3. Click on your device in the sidebar to display its contents.
  4. Depending on the device, you’ll need to drag your file into the appropriate destination folder.
    • Kindle: drag your file into the documentsfolder.
    • Nook: drag your Nook.epub file into the My Files/Books folder.
    • Kobo: drag your Kobo.kepub.epub file into the top-level contents of your eReader.
  5. With the file transferred (it’s quick), you can now “eject” your eReader using the button in the sidebar and then unplug it from your Mac.
  6. You should now see your ebook on your eReader.

Transferring to an Android Tablet

Kindle, Nook, and Kobo

To transfer to an Android Tablet, like the 2nd Generation Kindle Fire (or newer) or a Samsung Galaxy, you’ll use the Android File Transfer application.

  1. On your Mac, download and install the free Android File Transfer app.
  2. Connect the small end of the micro-USB cable to your tablet, and the large end to one of the free USB ports on your Mac.
  3. When your tablet is successfully connected, Android File Transfer should launch.
  4. Depending on the platform you are proofing, you'll drag your file to a different destination folder within the Android File Transfer app.
    • Kindle: drag your file into the kindlefolder.
    • Nook: drag your Nook.epub file into the Nook/Books folder.
    • Kobo: drag your Kobo.kepub.epub file into the Documents folder.
  5. With the transfer complete, you can now unplug your device from your Mac.
  6. If you are using Kindle or Nook, you should find you ebook when you open those applications.

    For Kobo, you'll need to import your ebook using the "vertical ellipsis" button in the upper-right. Touch that icon and select Import Items, which will bring up the following shelf:

    Select your ebook, and then use the Import Selected button to import it into your Kobo library.

    Note: Kobo will scan your entire tablet for epub files, so if you are proofing your Nook files on the same device, you may want to remove them before importing your Kobo ebooks.

Google Play

You will be able to view your ebook in any Google Play application once it has been uploaded successfully. To upload from your desktop, see the Desktop Reading Apps section above for the Google Play instructions.

You can also upload to Google Play using the application on your Android tablet. Simply email your Google Play file or transfer it using Dropbox, and then open it using the app.