How to remove image boundary in libreOffice Writer

Solution 1:

Go to View, uncheck the option Text Boundaries and you are done.

Solution 2:

Have a look at the following screenshots, where the same image is put twice in the text, using different settings.

Selecting the right image, then right clicking on it, then selecting Properties..., you get the Properties window where there are two things to notice:

1. Wrap → Spacing defines the blank space between image object and text.

   

2. Borders → Spacing to Contents defines the blank space between the image border and the image

   

Putting all those spacings to zero, leaves no blank space between the image and the text.

You can also try adjusting all other border attributes to your needs.