iCloud Photo Sharing
Kay - 

All of your photos, if you have iCloud Photo Library turned on, are automatically uploaded to iCloud.

All photos you upload to iCloud are available to be accessed online from the iCloud website. Simply sign in and select Photos. They are also automatically on your devices.

Now for removing them from your Mac:


Open Photos and press command + , to open the preference pane.
Select iCloud at the top and press Optimize Mac Storage This button only appears if iCloud Photo Library is checked above.



BONUS: Removing photos from the iPhone


Open Settings -&gt; Photos &amp; Camera
Select Optimize iPhone Storage under the iCloud Photo Library switch. This button only appears if iCloud Photo Library is enabled.