Ebook Mini Tools

Count the words in any EPUB ebook instantly. Get the total word count, character count, per-chapter breakdown, and an estimate of how long it takes to read.

Pull the cover image out of any EPUB ebook and download it as a picture file. Everything happens locally in your browser.

Swap the cover of any EPUB ebook — replace it with your own image, add a missing cover, or remove one you don't want. Everything happens locally in your browser.

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 EPUB metadata — locally in your browser, no upload.

A book that throws "not a valid EPUB" usually has broken packaging, not broken content. This tool runs a health check, rebuilds the container and mimetype entries, clears dead references, and hands you back a cleanly packed file — entirely in your browser. Free, no upload, no signup.

A missing, duplicated or dead-link table of contents makes a book unnavigable. This tool rebuilds the TOC from the book's actual chapter list — one entry per chapter, in true reading order — and writes it into both the EPUB3 nav document and the EPUB2 NCX, so every reader picks it up. Runs entirely in your browser; free.

Upload a photo, dither it for e-ink displays, and preview the result in a device simulator frame. Live side-by-side compare, one-click auto tune, and full-resolution PNG download.

Resize and crop any photo to the exact screen size of Kindle, Kobo, Boox and reMarkable devices. Download a PNG wallpaper, or an EPUB you can send to Kindle as a lock-screen cover. Everything runs in your browser.

Upload an EPUB and see how it will look on a Kindle, Kobo or other e-ink reader — grayscale modes, device frame, adjustable font size. Everything stays in your browser.