Answers.Body: <p>I have found eBookIt's online validator very good:
  <a href="http://www.ebookit.com/epub-validator3" rel="nofollow noreferrer">http://www.ebookit.com/epub-validator3</a></p>
  
  <p>[No longer exists at the specified location/URL]</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-01-03T00:35:34.680Z
Answers.Text: Isn;'that just a packaging of the idpf validator?
Answers.UserDisplayName: mmmmmm
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2014-01-02T21:29:14.050Z
Answers.LastActivityDate: 2019-11-26T04:50:57.133Z
Answers.LastEditDate: 2019-11-26T04:50:57.133Z
Answers.UserDisplayName: Peter Flynn
Answers.Body: <p>IDPF, the consortium that promotes the <code>.epub</code> standard, has released a tool named epubcheck.<br>
  It is available both via an online web-app <a href="http://validator.idpf.org/">here</a>, or as a stand-alone program <a href="https://github.com/IDPF/epubcheck">here</a>.</p>
  
  <p>There is also another tool called FlightCrew, available <a href="http://code.google.com/p/flightcrew/">here</a>; this is also integrated within Sigil, a full fledged epub editor (available <a href="http://code.google.com/p/sigil/">here</a>).</p>
  
  <p>All these tools are free and cross-platform.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-12-28T19:08:51.910Z
Answers.LastActivityDate: 2013-12-28T19:08:51.910Z
Answers.UserDisplayName: Sekhemty
Body: <p>How can I formally validate the structure of an <code>.epub</code> file and check it for errors?</p>
  
Tags: <epub><creation><validation>
Title: How can I validate an epub file?
UserDisplayName: Sekhemty
ThreadText: # How can I validate an epub file?
  
  (Asked by: username_0 on 2013-12-28)
  
  How can I formally validate the structure of an `.epub` file and check it for errors?
  
  **Tags:** epub, creation, validation
  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_0 on 2013-12-28. Score: 18 | Accepted answer
  
  IDPF, the consortium that promotes the `.epub` standard, has released a tool named epubcheck.  
  It is available both via an online web-app [here](http://validator.idpf.org/), or as a stand-alone program [here](https://github.com/IDPF/epubcheck).
  
  There is also another tool called FlightCrew, available [here](http://code.google.com/p/flightcrew/); this is also integrated within Sigil, a full fledged epub editor (available [here](http://code.google.com/p/sigil/)).
  
  All these tools are free and cross-platform.
  
  
  ---
  
  ### Answer by username_1 on 2014-01-02. Score: 0
  
  I have found eBookIt's online validator very good:
  <http://www.ebookit.com/epub-validator3>
  
  [No longer exists at the specified location/URL]
  
  > **Comments:**
  > **username_2**: Isn;'that just a packaging of the idpf validator?  
  
  ---
  
  