Sigil review
A capable free EPUB editor for authors comfortable with desktop publishing workflows.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Sigil is a free, open-source desktop application for creating, editing, formatting, and packaging EPUB ebooks. It supports EPUB 2 and EPUB 3 and is aimed at personal ebook formatting as well as professional editors publishing across multiple platforms. Authors can work in Code View or Preview View, edit metadata, generate multi-level tables of contents, check spelling with configurable dictionaries, and import EPUB, HTML, images, and stylesheets. Its Windows, macOS, and Linux availability also makes it suitable for users who want a cross-platform desktop editor.
The strongest part of Sigil's feature set is its control over EPUB production. Regular-expression find and replace can support detailed text and markup changes, while EPUB, CSS, and XHTML validation helps identify issues within the ebook package and its underlying files. Plugin support extends the editor's workflow, and checkpoint snapshots allow users to compare changes. These tools make Sigil particularly relevant to technically inclined authors and editors who are comfortable working with structured ebook content rather than relying only on visual formatting.
Sigil's narrow focus is also its main boundary. It is built around EPUB editing and packaging, so authors who need PDF output or broader publishing workflows should choose a different tool. The application is distributed as desktop software rather than a hosted service, which makes it a better fit for individual production work than for buyers specifically seeking a browser-based collaboration environment. Choose Sigil for free, cross-platform EPUB creation with detailed editing and validation controls; look elsewhere if your workflow depends on formats or publishing functions beyond EPUB.
Sigil pros and cons
- Where it wins
- Supports EPUB 2 and EPUB 3 editing with code and preview views
- Includes plugins, checkpoints, TOC tools, and configurable spell checking
- Runs on Windows, macOS, and Linux with EPUB validation tools
- Where it doesn't
- Focused on EPUB rather than broader publishing workflows
- PDF export is not part of its documented product capabilities
- Desktop software may not suit teams seeking a hosted service
Sigil fact sheet, pricing and score →
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