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Sigil is a free, open source, multi-platform ebook editor that uses Qt (and QtWebEngine). It is designed to edit books in ePub format (both ePub 2 and ePub 3).

Characteristics

• Free and open source software under GPLv3
• Multi-platform: runs on Windows, Linux and Mac
• Full UTF-16 support
• Full support for EPUB 2 specifications
• Multiple views: Book view, Code view and Preview
• WYSIWYG editing in book view
• Full control over direct editing of EPUB syntax in code view
• Table of contents generator with multi-level heading support
• Metadata editor with full support for all possible metadata entries (more than 200) with full descriptions for each
• User interface translated into many languages
• Spell check with standard and user-configurable dictionaries
• Full Regular Expression (PCRE) support for Find and Replace
• Supports import of EPUB and HTML files, images and style sheets,
• Documents can be validated for EPUB compliance with the integrated FlightCrew EPUB validator
• Embedded HTML Tyy: all imported files have their formatting corrected and your editing can be cleaned if necessary

What is new

Error corrections

• fix Checkpointing to work with dulwich version 0.20.46+
• fix css value parsing when !important is used
• EmbeddedPython fixes to work with Python 3.11 and later (thanks sharkcz)
• leave the cursor position unchanged if nothing is found when searching for groups of files
• get all numeric elements in reports right-justified
• add support for thousandths to Reports
• allow empty dc:language values ​​to prevent crashes (as Sigil-1.9.10 did)
• allow unknown language codes to pass through MetaEditor
• MetaEditor under epub2, allow custom opf schema values
• prevent duplicate spaces when reformatting CSS in imports, charsets, and namespaces
• better prevent accidental OPF attribute order changes to simplify Checkpoint differences
• fixed file menu Preview for xhtml and image tabs
• prevent plugins from crashing Sigil by deleting last xhtml file in epub
• fix issue where images/css could not be added correctly in an epub3 without css files

New features

• allow the user to edit checkpoint descriptions for clarity via the checkpoint menu
• add the ability to show the checkpoint changelog via the checkpoint menu
• update to Hunspell 1.7.2 (released December 2022) for spell checking
• update to latest zlib-1.2.13 for latest security fixes
• completely move away from using the OS system tmp folder for storing Sigil wip files
• instead, create a new “workspace” folder in the Sigil Preferences folder
• added the ability to preview and print the contents of Sigil’s preview window