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Sigil vs PageEdit: catalog facts
Sigil	PageEdit
Free Free and open source under the GPL.	Free Free and open source.
Windows, macOS, Linux	Windows, macOS, Linux
Edits EPUB 2 and EPUB 3 in a visual view or directly in the XHTML Built-in validation catches the errors that make readers reject a book	Visual editing of EPUB XHTML pages Works together with Sigil
EPUB only; it does not handle MOBI, AZW3 or PDF Some XHTML and CSS knowledge is needed to fix anything non-trivial	Edits individual pages, not whole EPUB structure Most useful alongside Sigil
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.