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Why this runs on your computer

There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Change the cover of an EPUB

Replace an EPUB's cover image, or add one where it is missing - here in this tab, with nothing uploaded.

How to change an epub cover

Drop your EPUB - its current cover is shown.
Choose a new cover image (JPEG or PNG).
Save the EPUB with the new cover.

Why this one stays private

Changing a cover should not mean uploading your book. The EPUB is opened, given its new cover and saved again, all in your browser.

Questions

What size should the cover be?

About 1600 × 2560 pixels (a 1:1.6 ratio) suits most readers and stores. Any size works; JPEG or PNG.

My reader still shows the old cover.

E-readers cache covers. Delete the book from the device and copy the new file across, or re-import it in Calibre or Apple Books.

Is anything else changed?

No - only the cover image and the entries that point to it. Text, styles and metadata stay as they were.

Does it work with books bought from Kindle, Kobo or Apple?

Only if they have no DRM. Copy-protected books are encrypted, and removing that is not something this site does. Books from Project Gutenberg, Standard Ebooks, Humble Bundle and most indie stores are DRM-free.

How to change an epub cover

Why this one stays private

Questions

Other tools here