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Validating your ebook

Validating and Testing your EPUB

Validating and testing your EPUB before you share it with family, friends, or a wider audience is an important step.

Validating

Sigil has a built-in EPUB Validator, but you can also upload your EPUB to a web-based validator.

Files that are 10 MB or smaller in size can be validated a web-based EPUB validator. For files that exceed this size, a desktop version of EPUB Check is available as a free download.

  1. Open Epub Validator in your browser.
  2. Upload the EPUB file you want to inspect and click the Upload and Recheck file button.
  3. This service will check to see if it complies with standards set by the World Wide Web Consortium (W3C). If your EPUB does not meet these specifications, it will return a message listing all the issues found in your EPUB. Each error message explains the problem and specifies the file and line(s) of code that you can refer to when troubleshooting.
  4. Once your EPUB file contains no errors, you will get a Results message letting you know. You can now proceed with the next step: publishing and distribution.

Testing

If you want to view and test your new Ebook in a free ereader Adobe Digital Editions is a great option. Here is a resource on some other good options:

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Adobe Digital Editions logo

Adobe Digital Editions
  • Download Adobe Digital Editions
  • Open Adobe Digital Editions (ADE).
  • Add the eBook by dragging and dropping the EPUB file into ADE or selecting FILE > ADD TO LIBRARY from the menu.
  • The EPUB can now be read and tested