Software · Office & notes

Sigil

Multi-platform EPUB ebook editor.

Completely free
Windows and Linux
Open source
No account

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by Winget (Windows Package Manager), Flathub
License: GPL-3.0+ — Open source (copyleft)confirmed by Winget (Windows Package Manager), Flathub
Open source: Yes
Commercial use: Yesconfirmed by Winget (Windows Package Manager), Flathub, Official plan pages (pricing, licence, terms)
Account required: Noconfirmed by Winget (Windows Package Manager)
Credit card required: Noconfirmed by Winget (Windows Package Manager), Flathub
Watermark: Not applicable
Ads: not documented
Platforms: Windows and LinuxEstablished by Linux: Flathub · Windows: Winget
Publisher: Sigil-Ebook
Latest version: 2.8.5 (6 November 2026)
Latest activity: 6 November 2026
Source code: github.com/Sigil-Ebook/Sigil

At a glance

All of Sigil is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No account needed
Commercial use allowed

About

Sigil was designed to make it easy to create great ebooks using the EPUB format. If you are formatting books for your own use, or you are a professional editor publishing books on multiple platforms, then Sigil is for you. You can use Sigil to format and package your books into an EPUB that looks exactly the way you want it to using an advanced set of features that have made Sigil one of most popular EPUB editors available. This open-source and completely free software is written and supported entirely by volunteers. The current Sigil development team includes Doug Massay and Kevin Hendricks as co-lead developers and maintainers. Previous developers/authors include John Schember, Grant Drake and Dave Heiland. Sigil was originally created by Strahinja Markovic in 2009 and remains completely free to download and use. Support is also provided by other volunteers who contribute code, translations and helpful answers to user’s questions. See the Help=>About menu in Sigil for a complete list of contributors. Some Sigil features: Free and open source software under GPLv3 Multi-platform: runs on Windows, Mac, and Linux Full UTF-16 support EPUB 2 and EPUB 3 spec support Multiple Views: Code View and Preview View Complete control over directly editing EPUB syntax in Code View Table of Contents generator with multi-level heading support Metadata editor User interface translated into many languages Themeable icons Spell checking with default and user configurable dictionaries Full Regular Expression (PCRE) support for Find & Replace Supports import of EPUB and HTML files, images, and style sheets All imported files can have their formatting mended, and your code can be optionally “prettified” Plugin Support Checkpoint support (compare “snapshots” of changes) Pies and Puppies!

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Winget (Windows Package Manager) (credit card, account, source code, publisher, licence, free status, platforms, commercial use, version) — 10 November 2026
Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) — 9 November 2026
Facts collected from Official plan pages (pricing, licence, terms) (commercial use) — 8 November 2026
Last technical check: 7 November 2026
Description from Flathub — AppStream (Flathub)

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