Question: how to export photos from lightroom web?
Answer: Choose the location of where you want to export the photos. ... 
Choose the file type. ... 
Make sure 'Resize to fit' is selected. ... 
Change the resolution to 72 pixels per inch (ppi).
Choose sharpen for 'screen'
If you want to watermark your image in Lightroom you would do so here. ... 
Click Export.