Book Collector will try to upsync cover images for books that don’t already have a cover in the CLZ Cloud. The images are restricted to 500kb in size, if your images are larger than this, they won’t be uploaded.

Images are only automatically upsynced to CLZ Cloud if:

  • The image is below 500kb in size
  • Your book is not linked
  • We don’t already have a cover for that book
  • The cover we have is of lower quality

If we already have a cover for your book the default image from Core for Books. That’s why” it’s important to link your books”:#404 to the correct book in Core for Books (only possible on PC/Mac currently).

If you have a cover that you want to upsync to CLZ Cloud even though there’s already one in CLZ Cloud you can do this using this method:

Manually Upload a Cover to CLZ Cloud


  1. Right click on the book
  2. Click Upload Cover for Selected Book

iOS/Android Mobile device

  1. Select an book
  2. Tap the pencil icon to edit the item.
  3. Near the cover image tap on the square icon with the arrow pointing out of it.
  4. Now tap “Upload Cover to CLZ Cloud”.

Need more help with this?
Don’t hesitate to contact us here.

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