Size of my pictures

I'm creating a Photo book. Therefor I need to reduce the size of my pictures, for this I use Lightroom. In the folder I see the size of the Pictures afterwards with around 700KB. Now I import them in the Book creator (myPIX.com) and get the Information that the size is to big, more than 25 Megapixel and that I should reduce the size.
What is wrong?
What do I have to change?
Who can help me?
Thanks a lot!.

3) Yes I export the pictures, settings: jpeg; color sRGB; Quality 60; size reduce to 700k // picture size 260 pixel/cm
Ignore the file size. This is so meaningless that it is a total waste of time to look at. The error message you received is talking about megapixels and not megabytes ... these are no the same, and one does not imply the other.
You want to look at the number of megapixels in the exported photo. Your export settings do not change the number of megapixels, so yes, you are getting very large images. You are getting photos that are 7360x4912 which is over 36 megapixels.
So, in the Export dialog box, you need to check "Resize to Fit" and then set the settings in Image Sizing so that the exported photo is less than 25 megapixels. For example if you set the height and width to half o the 7360x4912, you are all set.

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