# 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.

- Canonical page: https://kdp123.com/t/sigil/
- Official site: https://sigil-ebook.com
- Categories: Writing & Formatting
- Price: Free (Free and open source (GPLv3).)
- Platforms: windows, mac, linux
- Outputs KDP-ready files: Yes
- Touches your KDP account: No
- Official Amazon product: No
- 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.

## 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](https://kdp123.com/t/calibre/)
- [Jutoh](https://kdp123.com/t/jutoh/)
- [Pandoc](https://kdp123.com/t/pandoc/)

## Sources

- https://sigil-ebook.com/
- https://sigil-ebook.com/sigil/