Merge EPUB Files

Merge EPUB Files is built for readers and small publishers who hold a book split across several .epub files and want a single volume. The clearest fits are stitching a series into one omnibus, joining individual chapter EPUBs that were exported separately back into a complete book, and combining two or three volumes of the same work so they sit as one item in a library instead of several.

It is also useful for sharing and shelf-keeping: one file is easier to send, sideload to an e-reader, or archive than a folder of fragments. Because each source book gets its own title page and its own branch in the table of contents, anthologies of short works or collected drafts stay visibly separated inside the combined file rather than blurring together.

This is a reader-and-author convenience tool, not a typesetting or layout engine. If your goal is a consistent house style across all the books or a press-ready master, treat the merged file as a starting point and finish it in dedicated EPUB editing software.

Drop your first .epub onto the upload area, then add more one at a time; each appears in a numbered list with its title, author and size. Use the up and down arrows to change the order and the trash icon to remove a book. Once at least two books are loaded, set the combined book's Title (default "Merged Book") and an optional Author, then press Merge. If you leave the author empty, the authors of all the books are listed.

Behind the scenes the tool writes a new EPUB 3 package in your browser. Each book's files are copied into their own folder (book1, book2 and so on), so every internal link, image and stylesheet still resolves; a title page with the book's title and author is placed before each book; the reading order follows your list; and a new navigation document nests each book's own table of contents under its title. The package gets a new identifier, the languages of all the books, and the first book's cover. The download is named after your title. Everything runs client-side, nothing is uploaded, and the files clear when the tab closes.

Supported input is reflowable EPUB only. It does not convert other formats, restyle text, design a new cover, or edit chapter content.

Several limits are firm. Fixed-layout EPUBs (comics, picture books, many cookbooks) are refused, DRM-protected files are refused, and a single merge accepts at most ten EPUBs. A file that fails to open is reported as not a valid EPUB rather than partially merged.

Styling stays per book: each book's pages keep linking their own stylesheets, so a book looks as it did, but different books keep different designs. The merged book takes the first book's cover, which may not be what you want for an omnibus; reorder the books or replace the cover afterwards.

Other things to know: the Merge button needs at least two books, and each book's own contents page is replaced by the merged table of contents, so a link in a book's text to its old contents page will not work.

Open the result in a real reader, not just a thumbnail. Confirm the books appear in the intended order, that each title page introduces the right book, and that the table of contents shows every book with its chapters. Page through the boundaries between books to catch spacing or style changes, and verify the final title and author you set show up in the e-reader's book details.

Spot-check a few chapters inside each book for missing images or broken links, and if you intend to sideload to a specific device or store, run the file through a validator or that store's checker, because a merged package can satisfy a reader yet still trip stricter ingestion rules.

For a for-sale omnibus, review the generated metadata, contents and title pages as a draft.