Is your EPUB 90 MB? Make it smaller without changing what readers see
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R. S. Breed Founder
Big EPUBs are usually a handful of pictures far bigger than any screen shows: a 4000-pixel chapter ornament, a full-resolution photo. Or a tool saved the file with nothing compressed. On KDP's 70% royalty plan, every megabyte costs you a delivery charge on every sale, and big files download slowly everywhere.
Drop it in here: https://bervet.com/tools/book-file-optimiser
- Text (your pages, styles and contents) gets compressed.
- Pictures bigger than the size you choose (2560 pixels on the long side by default), or over Apple's 4 million pixels, are scaled down. They keep their shape and format, and a picture is only swapped if the new one is clearly smaller. Your cover keeps its size.
- Leftover computer files (.DS_Store and the like) are left out.
- Your words, fonts, links and file names aren't touched. Then it runs the EPUB checker on the result to make sure nothing broke.
On one 163 MB cookbook EPUB with 81 full-resolution photos, it came out at 56 MB, with nothing new for the checker to flag.
It does covers too: drop in a JPG or PNG and it brings it under KDP's 5 MB at the same pixel size.
It shrinks print PDFs too, carefully, by changing colour photos only: ones printed far sharper than printing needs come down to 300 ppi, and ones stored losslessly (some programs do this, and it can make each photo several times the size) are saved as high-quality JPEG. Charts and drawings stay lossless, and the new file is compared with yours page by page before it's offered. A 328 MB cookbook interior came out at 51 MB.
It runs in your browser, nothing is uploaded, and it's free for members.