Metadata is separate from page content
A book title in package metadata controls many library displays. A title printed in an XHTML title page is independent. Change both when you need them to agree; altering the catalogue title alone does not rewrite chapters.
Keep a clean source
Work on a copy of an unencrypted EPUB. The editor preserves the archive resources and changes targeted package fields. It checks that manifest resources and reading-order references still exist before returning the output.
Encrypted or obfuscated resources can depend on identifiers and specialized handling. This tool rejects those packages instead of risking a book that opens but cannot display its fonts or content.
Make a focused metadata edit
Select your EPUB and enter only the fields you want to replace. Leaving title, author or language blank preserves the current value; it does not erase that field. For example, change a draft title from Garden Notes to Garden Notes: Spring Edition while leaving author blank. Run the edit and confirm that the result shows the new title and the intended author.
Use a language tag such as en or en-US, not a prose label such as English language. Metadata is text, so characters such as ampersands are escaped correctly when the package XML is written. This editor changes the first matching creator field; a book with several contributors or elaborate role refinements may need a dedicated EPUB editor for a more nuanced metadata update.
Check the reader’s cached library entry
Download edited-book.epub to a new filename and open that specific file. Some reading applications retain catalogue information from an earlier import, so a stale library title does not necessarily mean the EPUB edit failed. Compare the tool’s reopened package inventory and use your reader’s documented replace-or-reimport workflow. Avoid deleting an annotated original merely to refresh its thumbnail.