Repair your EPUB Online

Do you have an EPUB eBook file that will not open correctly? If so, our free-to-use EPUB repair tool may be able to help. Our tool analyses the content of your EPUB eBook file and is able to determine if the container, pages, and additional support files such as the table of contents, images, etc. are valid. Our tool will let you know what is wrong with your EPUB file and attempt to fix it.

Or drag and drop your files here to upload.
A maximum of 20 files can be uploaded at once.

Please note: Your EPUB, once uploaded to our server, will be deleted 15 minutes after upload.
If our tool offers the option to repair your file, please ensure you download the repaired file within this time period.

How to Repair your EPUB Online?

Here are 3 simple steps to repair your EPUB using our fast and free repair tool.

Upload your EPUB

Click the "Select File" button, then select a EPUB file. The maximum file size is 100MB.

Analysis and Repair

Your EPUB file will be analysed, and our tool will attempt to repair your EPUB file if possible.

Repair or Convert your EPUB

Select an option to either repair or convert to receive your repaired EPUB file.

EPUB file format information

Full NameePub
Mime Typeapplication/epub+zip

An ePub file, short for "electronic publication," is a standard digital format used for storing and distributing e-books and other types of digital publications. It is a highly versatile and widely adopted format that allows readers to access content on various devices such as e-readers, smartphones, tablets, and computers. The ePub format is based on open web standards, making it compatible with different reading platforms, and it supports reflowable content, meaning the text can adapt to different screen sizes and orientations.

One of the key advantages of ePub files is their ability to adjust the font size, line spacing, and margins, giving readers greater control over the reading experience. This format supports interactive elements like hyperlinks, annotations, and multimedia content, enhancing the overall engagement and interactivity of the digital publication. ePub files also enable bookmarking, highlighting, and note-taking, allowing users to easily revisit and organize their reading preferences.

Creating an ePub file involves packaging together various resources, such as HTML, CSS, images, and fonts, into a single compressed container. This container format ensures efficient storage and distribution of e-books, making it convenient for authors, publishers, and readers alike. With its accessibility features and cross-platform compatibility, ePub has become the go-to choice for digital publishing, revolutionizing the way we consume written content in the modern digital age.

Repairing a EPUB File

EPUB eBook File Header Data

All EPUB files contain binary data, with the initial sequence of bytes within the file given up to describe the file and its contents in what is known as the file header. This section of the file contains useful information that our EPUB eBook repair tool can use to help with the repair process.

The EPUB format utilizes the ZIP format as the underlying container for the various pages of the eBook. These pages are stored in XML format, along with the table of contents and any additional media files, such as images.

Our eBook repair tool attempts to seek out the individual eBook content files to perform validation and, if necessary, repair any that seem invalid.

Chapters and Table of Content

Along with the individual eBook pages, our EPUB repair tool will also look to repair any additional support files, such as the table of contents and the chapter definitions. If there are any additional media files, such as images, these will be processed by our various image repair tools.

Frequently Asked Questions

Is it free to use the EPUB file repair tool?

Yes! Our EPUB repair tool is 100% free to use.

Are there any usage limits when repairing my EPUB file?

No, you can repair as many files as you wish. We do not have any limits when using our EPUB repair tool.

How long does it take to repair my EPUB?

We aim to process EPUB repairs as quickly as possible; this usually takes around 5 seconds; however, this may be longer depending on the file size and data needed to be repaired.

What does the EPUB repair process involve?

Once your EPUB has been selected, it will undergo some initial checks to verify that the file has some basic information. If the initial checks pass, we then upload the file to our servers for more detailed analysis.

Is it safe to repair my EPUB on

Yes, of course it is! Your EPUB, once repaired, is deleted 15 minutes after upload, and any download link will expire after this time.

Can I repair my EPUB on Windows, Linux, Android, iOS or Mac OS?

Yes! Our EPUB repair tool will run on any system with a modern web browser.