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EPUB Metadata Editor
Correct the details your reader actually shows: title, author, ISBN, language, publisher and description are read from the book, edited in one form, and written back into the real package metadata. Sideloaded books with mangled author names, missing titles or wrong sort order are fixed in a minute — entirely in your browser, no upload, free.
01Select your EPUB
How to edit EPUB metadata
Select your EPUB file
Open the book from your device. Its current metadata is read locally and shown in the form.
Edit the fields
Change title, author, ISBN, language, publisher or description. Fields you leave empty are kept as they are.
Download the updated EPUB
Save the file, re-import it into your reader, and the corrected details appear everywhere.
What metadata lives in an EPUB
Every EPUB carries Dublin Core metadata in its package file: dc:title, dc:creator, dc:language, dc:identifier and friends. Readers use it for the shelf card, sorting, search and the book's info page — which is why a wrong author name haunts every screen.
ISBN is stored as an identifier with an ISBN scheme. If the book has none, one is added; if it has several, the ISBN one is updated so you never end up with duplicates.
Why your reader still shows the old title
Many readers cache metadata at import time. After editing, delete the book from the reader and re-import the fixed file — the fresh metadata is picked up immediately.
Frequently asked questions
Which metadata fields can I edit?
Title, author, ISBN, language, publisher and description — the fields readers display and librarians care about. Everything else in the book is untouched.
How is the ISBN stored?
As a dc:identifier in the standard urn:isbn: form with scheme="ISBN". Existing ISBN entries are updated in place rather than duplicated.
If I clear a field, is the data erased?
No. Empty fields are skipped — the tool only writes fields with content. Clearing the form is always safe.
Will the cover or chapters change?
No. Only the metadata block of the package file is rewritten; the cover, chapters, styles and reading order are copied unchanged.
Why does my reader still show the old author?
Readers cache metadata when a book is imported. Remove the book from the reader, then import the edited file again.
Is my book uploaded to a server?
Never. Editing happens entirely in your browser — you can verify it in the network inspector: zero uploads while you work.