Software update: Sigil 1.6.0

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Sigil is an open source ebook editor with extensive possibilities, which is developed for Windows, Linux and macOS. The program can import both epub and html files, including formatting and images. The support for epub2 is one hundred percent and that for epub3 is almost complete. It can further generate a multi-level table of contents and edit the epub syntax directly in the code view. In version 1.6.0 the following changes and improvements have been made:

New Features:

  • Find and Replace search targets expanded to include tabbed files, CSS files, OPF and NCX files
  • Saved Searches now save full search Controls (mode, direction, options, and targets)
  • Preview loading is now completely asynchronous with a loading progress bar and loading placeholder
  • Merge will now automatically prevent duplicate ids
  • Merge will automatically add ids are former file boundaries to prevent TOC, Guide, and href losses
  • A new Xhtml Highlighter speeds up huge single file loading considerably
  • Redesigned CodeView Spellchecking to bring it back to Sigil-1.3.0 speeds
  • The External XHTML editor will now always pass along the OPF path and spine position
    to simplify interface with PageEdit (use “Open With” if you want the old behavior)
  • Added PyQtWebEngine as a newly required python module for Plugins.
    ie. Plugins now have access to browser functionality for implementing e-Readers, more complex guis.

Bug Fixes:

  • Add Qt workaround for restoring Sigil window sizes when FindReplace left open on macOS
  • Add missing tr () calls to the tooltips in the Special Character selection dialog
  • Fix bug when all unused selectors are removed as in css stylesheet – adds a comment placeholder
  • Make empty Nav have a title to help empty epub passing epubcheck
  • Fix bug where fonts couldn’t be previewed when a space was in the path
  • Redesigned code to make Merging large numbers of files much faster (Thank you Text2002ans)
  • Fix bug in blank language field in Spellcheck Dialog (Thank you Text2002ans)
  • Fix use of different identification of css via PR from BeckyEbook (Thank you)
  • Fix typos in plugin framework guide (Thank you Doitsu)
  • Fix hang on launch when opf manifested files exist inside the META_INF (Thank you un_pogaz)
  • Fix Metadata Editor bugs related to alternate script (Thank you Carmina16) (# 613)
  • Fix Metadata Editor bugs related to epub2 event dates (Thank you Octet-nl) (# 616)


  • The Sigil user guide has been updated for Sigil-1.6.0 + for the new Saved Search Controls and Find & Replace targets. It can always be downloaded from its own repository
  • Three new e-Reader plugins for Sigil have been built to help users see what their ebook might look like in real e-readers while still inside Sigil. See this post for descriptions and links.
  • Please check the Sigil Wiki for important Sigil support links, additional resource downloads, and platform-specific trouble-shooting tips / requirements.
  • Mac users should still download and install ActiveState’s ActiveTcl Community Edition to utilize plugins that use Tk / Tcl GUIs. See these notes.
  • Mac users should also check out the wiki entry on the New Release File Format.

Version number 1.6.0
Release status Final
Operating systems Windows 7, Linux, macOS, Windows 8, Windows 10
Website Sigil
File size


License type GPL
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