Sigil
Sigil is a free, open-source EPUB editor for Windows, Mac and Linux that lets you edit an ebook's HTML, CSS and structure directly.
At a glance
- Price
- Free (Free and open source (GPLv3).)
- Platforms
- Windows, Mac, Linux
- Outputs KDP-ready files
- Yes
- Touches your KDP account
- No
- Categories
- Writing & Formatting
- Last checked
- 2026-11-09
Summary
Sigil opens and edits EPUB 2 and EPUB 3 files at the code level, with a companion WYSIWYG editor called PageEdit, so it suits publishers who want to hand-tune or repair an ebook before uploading the EPUB to KDP. It works only with EPUB: it does not lay out print interiors and is not a beginner formatter. It is built and supported by volunteers.
Best for
- Hand-editing or repairing EPUB files
Pros
- Free, with full control over the EPUB's markup
- Supports both EPUB 2 and EPUB 3
Cons
- Ebook only; nothing for paperbacks
- Assumes comfort with HTML and CSS
Alternatives
- calibre: calibre is a free, open-source ebook manager for Windows, Mac and Linux that converts Word and other files to EPUB and includes an EPUB editor.
- Jutoh: Jutoh is a desktop ebook editor for Windows, Mac and Linux that imports Word files and compiles EPUB and Kindle-ready books, sold for a one-time price.
- Pandoc: Pandoc is a free, open-source command-line converter that turns Markdown, Word and other formats into EPUB, DOCX and, through LaTeX, PDF.
Sources
Facts on this page come from the vendor and these pages. Prices change; confirm on the vendor site.
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