EPUB Image Optimizer
Resize oversized image assets inside EPUB files for Kindle, Kobo, and mobile reading profiles, then download a lighter ebook.
Drag and drop or click to upload
EPUB only
Why image-heavy EPUB files become a problem
Illustrated light novels and converted ebooks often carry images that are much larger than the target device actually needs. That makes uploads slower, increases storage, and can create bad behavior on older e-readers or smaller mobile devices.
This optimizer scans the EPUB image manifest, resizes oversized assets to a device-friendly profile, and rebuilds the archive for Kindle, Kobo, or mobile reading. The result is a lighter file that is easier to move, easier to read, and easier to feed into other workflows.
Best use cases
Use it for illustration-heavy novels, image-rich EPUB conversions, or any file that feels bigger than it should be. It is especially helpful before translation uploads or before long-term storage in a personal library.