Files and uploading overview

Some features described on this page may not be available, as selling books on Google Play is limited to certain countries.

File formats

Google accepts the following file formats:

If you're planning to sell your book on Google Play, provide your book content in both EPUB and PDF format to give your readers more viewing options. However, only one format is required.

Even when the cover image is embedded within the EPUB or PDF file, you may wish to submit the cover image in a separate file. Google will use this file when displaying the book cover as a thumbnail.

Content guidelines

Before you upload any files, please ensure your content meets Google's guidelines. If you plan to sell your books on Google Play, you should also review our publisher content policies for books on Google Play.

Size limits

  • Each file (including cover image files) should be less than 2 GB in size.
  • The book should be at least four pages long.

Format-specific guidelines

  • The PDF file must consist of the complete book (or be one of a set of specially named multi-part files). Do not upload sample content (such as an excerpt); your Google Search preview settings control the amount that a user can preview.
  • The PDF file must not be password-protected, as this will prevent the file from processing.
  • To automatically generate a table of contents, include bookmarks in the PDF file.
  • The EPUB file must contain the front cover image.
  • The EPUB file must consist of the complete book. Do not upload sample content (such as an excerpt); your Google Search preview settings control the amount that a user can preview.
  • The EPUB file should be validated by EpubCheck.


Check the table below for example filenames, depending on how you plan to submit your files.

A single PDF file that includes the cover
  • Content and cover
    • ISBN.pdf
A PDF file that does not contain covers; cover images provided in separate files *
  • Content, no cover (required)
    • ISBN_interior.pdf
  • Front cover (required)
    • ISBN_frontcover.jpg (file extension may differ, such as JPEG, TIFF, PDF, or PNG)
  • Back cover (optional, but should be uploaded first if submitted)
    • ISBN_backcover.jpg (file extension may differ, such as JPEG, TIFF, PDF, or PNG)

* An incomplete set of files will not process. Read more.

A book split into multiple PDF files *
  • Cover and content
    • ISBN_1of3.pdf (numbering may differ)
    • ISBN_2of3.pdf (numbering may differ)
    • ISBN_3of3.pdf (numbering may differ)

* An incomplete set of files will not process. Read more.

An EPUB file
  • Content, including cover (required)
    • ISBN.epub
  • Front cover (optional; used for marketing thumbnail)
    • ISBN_frontcover.jpg (file extension may differr, such as JPEG, TIFF, PDF, or PNG)

Which identifier to use:

  • If you upload files for a single book from the book's "Content" tab: You don't need to include the identifier in the filename. Otherwise, the identifier is necessary to associate the file with the correct book. The filename extension will be used to determine what kind of file you've uploaded.

  • If your books already have unique identifiers (such as an ISBN or a Google-assigned GGKEY): Replace ISBN in the example filenames above with the book's actual identifier. (For GGKEY identifiers, you don't have to include the GGKEY: prefix.) If you have both a print and an electronic ISBN, we generally recommend naming your PDF files using the print ISBN, and naming the EPUB files using the electronic ISBN. See more information about ISBNs.

  • If your books don't have unique identifiers: You can use your own filenames, replacing ISBN in the example filenames above with text of your choice. 10-digit or 13-digit numbers should be avoided, as they may be mistaken by our system to be ISBNs. We also recommend that you avoid using the underscore character ( _) except as noted in the examples (e.g., _interior or _frontcover).

Cover files

Cover files should be in JPEG, PDF, TIFF, or PNG format and have the appropriate filename extension.

How to upload files

There are two ways to upload files in the Partner Center:

  • Upload files for a single book (from the Content tab of the book's settings).

  • Upload files for as multiple books at the same time (from the Book Catalog, using the Advanced > Add multiple content files function).

Multiple files for a single book

For the following cases, you should submit all the required files in order to process your book:

  • a book split into multiple PDF files (e.g., ISBN_1of2.pdf and ISBN_2of2.pdf)
  • a PDF file without a cover accompanied by a separate cover image file (e.g., ISBN_interior.pdf and ISBN_frontcover.jpg)

If you are submitting a separate back cover image file (ISBN_backcover.jpg), we recommend that you upload it before you upload the content file (ISBN_interior.pdf).

If all the required files aren't submitted at the same time, they will be listed under "Pending Content" on the Content tab for the book and the content or cover will not process until all the expected files have been submitted. For example, ISBN_frontcover.pdf will remain listed under "Pending Content" until ISBN_interior.pdf is uploaded.

Updates for these books are also processed differently.

How to update files

You can update a file by uploading the new version. It will supersede the old version. Any users who already downloaded the old version will need to reload the book to see the new version.

If you submit an updated file from the Book Catalog (using the Advanced > Add multiple content files function rather than from the specific book's Content tab), the updated file should either use the same filename as the original file, or use the identifier as a prefix (such as in the examples above). Using a different filename or a filename that doesn't contain the identifier will generate a new book listing in your Book Catalog. An exception exists for separate cover images in PDF files (see below).

Updating books with multiple files (filesets):
  • Multi-part PDFs (e.g., ISBN_1of2.pdf and ISBN_2of2.pdf): You must re-submit all the files, even if not all of them are being updated.
  • A PDF file without the cover (e.g., ISBN_interior.pdf and ISBN_frontcover.jpg): You must re-submit the content (ISBN_interior.pdf) in order to trigger the processing of the most recent set of files. Alternatively, if you're updating the cover image with a PDF file and not changing any other files, name the file as ISBN_frontcoveronly.pdf.

File status and history

You can view the status of the status of files you've submitted by visiting your Book Catalog, clicking the book title, then going to the Content tab.

Your most recently uploaded files which haven't yet processed will display under "Pending Content" with a status message. If there are any issues, click the error message for more information. If your files process successfully, the latest versions of each display type (i.e., the most recent EPUB file, the most recent PDF file, and the most recent cover image file) will be listed under "Processed Content" or "Cover Files."

Filenames listed in the history may differ from the filenames you used when submitting files, as any files submitted through the Content tab will be renamed to include the identifier in the filename. This won't interfere with the processing of your files.

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