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Improved recovery of saved book results after interruptions.
Fix the cover, series and book number inside an EPUB file on your phone.
Fix the details that make an EPUB look wrong on your shelf. Change the cover, title, ordered authors, author sort values, series, book number, tags, language, publisher and description. The changes are written into the EPUB file itself, so they travel with the copy you save. Pick an EPUB or start with a sample. Review its package version, protection state and size before editing. Cover images can be cropped and prepared in the app. Saving creates a new file, reads that file back, and compares the written metadata before reporting success. Your original stays unchanged. The app writes both common series conventions and both common cover conventions. Decimal book numbers such as 3.25 and 4.5 are supported. KEPUB names keep their double extension. Protected, encrypted, malformed and unsupported books are refused rather than rewritten. Single-book editing is free and unlimited. A one-time Pro purchase adds series batch work: choose multiple books, reorder them, apply one series, author or set of tags, set decimal number overrides, preview each change, rename output files from a template and receive a result for every book. A batch run supports up to 40 books in the current version. No account, ads, cloud sync, online metadata lookup or DRM removal. Book contents and metadata are processed on the device. Google Play services the optional purchase. Reader note: metadata is stored in the file, but each reading device decides what it displays. Stock Kobo firmware does not populate its Series tab from sideloaded EPUB metadata without calibre's Kobo driver or compatible device software.