Free · Private · In your browser
EPUB Metadata Editor
Fix titles, authors, series info and covers without installing Calibre. Your book never leaves your device.
Files never uploaded Works offline Free, no signup No file size limits
How it works
- Drop an EPUB – its current title, authors, series, description and cover load into the form.
- Edit what needs fixing; replace the cover with a JPEG or PNG if you like.
- Save, and download the same book with clean metadata written straight into the file.
Why “no upload” matters
Every conventional converter site works the same way: your file travels to their server, sits in their queue, gets converted on their hardware, and – you hope – gets deleted afterwards. You can’t verify any of it. The FBI has even warned about free converter sites that use that upload as a way to deliver malware or harvest the documents themselves. A home library is a personal thing; tidying it shouldn’t mean exporting it.
ebook.tools removes the question entirely. The converter is delivered to your browser as code and runs on your machine; the file you drop is opened from memory, transformed, and saved back – the network isn’t involved at all. That isn’t a policy promise, it’s an architecture, and you can test it: load this page, switch off your wifi, and convert. It works exactly the same, because there was never anything to send.
Why metadata is worth fixing, and how the editor works
Metadata is how your library stays sane. The title and author shown on your reader's shelf, the series grouping that keeps a trilogy in order, the cover that makes a book findable at a glance, the description synced across your devices – all of it lives inside the EPUB itself, in a small XML file called the package document. When it's wrong ("Unknown Author", a filename where the title should be, book 3 shelved before book 1), every app that ever opens the file inherits the mess.
The traditional fix is installing Calibre – a superb library manager, and a lot of software to install for a thirty-second edit. This editor is the browser-sized alternative: drop the EPUB, and its current metadata loads into a form. Title, authors, series name and position, description, language, publisher and date are all editable. Covers can be replaced with any JPEG or PNG.
Series data is written both ways. There are two conventions in the wild – the Calibre-style entries older apps read, and the EPUB 3 collection metadata newer readers (including Kobo) use. The editor writes both, so your series order shows up correctly everywhere, which is precisely the interoperability detail that's annoying to get right by hand.
Edits are surgical. Only the package document (and the cover image, if you replace it) is rewritten; every chapter, style and image in your book passes through byte-for-byte untouched. Nothing is uploaded anywhere – the file is opened, edited and repacked entirely in your browser's memory, which for something as personal as a home library is how it should work.