EpubCCCompress an EPUB
EpubCC makes an EPUB smaller by resizing its JPEG and PNG images for e-reader screens and re-encoding them, keeping each one only when the new file is smaller. Text, fonts and styles don't change, and the result is checked with EPUBCheck.
Free, no account needed.
Updated:
Private files. Never used for training. Deleted automatically, or right away when you press Delete now.
How much smaller?
It depends on the images. An EPUB of NASA presentation slides went from 7.8 MB to 4.3 MB with the smaller-file setting. A book whose images are already small JPEGs may only lose 1–3 %, and the result page says so instead of pretending.
Normal keeps images up to 1,600 px on their longest side, which looks the same on any e-reader. Smaller file goes down to 1,200 px and a stronger JPEG setting.
When it helps
- Send to Kindle and email have size limits per file.
- Phones and older e-readers open smaller books faster.
- Stores and libraries sometimes cap the size of an upload.
FAQ
Is it free?
Yes. It's free and needs no account.
Will the text change?
No. Only JPEG and PNG images are re-encoded; everything else is copied as it was.
What happens to my EPUB?
The EPUB you upload is deleted as soon as the result is ready. The result is deleted 1 hour after your first download, or 24 hours after it's ready. Files are never published or used for training.