Sigil Can Now Make Epub3 Files

89061660_d7dd26d3a6_oFor the longest time this blogger has liked and recommended Sigil as an open-source Epub creation app. It’s free, easy to use, and can be used to make a standard Epub ebook.

And now I found a new reason to like it. I was catching up on conversations on Twitter when I came across an offhand mention of Epub3. A friend happened to mention that Sigil had an Epub3 plugin.

sigilShe was right (thanks, Moriah!) Sigil has had an Epub3 plugin since at least November 2014.

The plugin takes a valid Epub file and reprocesses it to turn it into an Epub3 file. It doesn’t enable you to edit an Epub3 file, just create one, but it’s still more useful than a box of rocks.

I haven’t had a reason to use it so I can’t comment on how well it works. But I do see that the plugin has received numerous updates in the past 8 months.

Update: According to a user report on Twitter, the plugin can take up to a minute to generate an Epub3 ebook. The output needed some tweaking before it would validate.

Have you tried it?

P.S. While we’re on the topic of plugins, there are a dozen plugins for Sigil, and they each serve a different purpose. Several of the plugins will help you clean up your Epub ebook by removing and fixing subtle problems (like punctuation, styles, extraneous entries in the OPF). There’s also an EpubCheck plugin and (my favorite) a plugin which lets you import Kindle ebooks and edit them.

What can I say, I like doing things backwards.

image by mwilkie

Nate Hoffelder

View posts by Nate Hoffelder
Nate Hoffelder is the founder and editor of The Digital Reader. He has been blogging about indie authors since 2010 while learning new tech skills weekly. He fixes author sites, and shares what he learns on The Digital Reader's blog. In his spare time, he fosters dogs for A Forever Home, a local rescue group.


  1. Sigil and Screwdrivers: What Makes an Ebook Development Tool? | Digital Book World14 July, 2015

    […] Sigil is ebook production software, created and updated by ebook developers. It’s a tool for not coding ebooks manually. It’s free and open-source, so it was slow to support EPUB3, and in the meantime I switched to oXygen. (Sigil can now generate EPUB3 files from its native EPUB2.) […]

  2. Andri Nel14 July, 2015

    This is amazing news! I have been using Sigil for a while but it was frustrating that I couldn’t make ePub 3 as most of my clients want to latest version. So this is wonderful news for me and my clients!

    1. Nate Hoffelder14 July, 2015

      It is good news, isn’t it?

  3. Why Sigil is like a screwdriver - TeleRead: News and views on e-books, libraries, publishing and related topics18 July, 2015

    […] the process of editing XML code in ways that oXygen doesn’t, rather like InDesign. And Sigil was recently updated to allow creating EPUB3 files from its native […]

  4. […] auf weiteres kann man lediglich ein Sigil-Plugin installieren, mit dem sich E-Book-Dateien ins epub3-Format konvertieren lassen, das Editieren von […]


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