Thank you for your feedback! Highlighter tool for scanned documents is in progress! Hopefully our developers can finish this soon!
Xodo TeamJaya Prakash commented
Need area highlight tool like foxit reader, it is very useful for highlight text in flattened PDFs.
First you should know what is area highlight tool in foxit.
In a flattened pdf we can't select text to highlight. In that case if we use ink tool, it looks like a extra layer. But the area highlight tool in foxit, intelligently highlights the blank area but not text area
The ink tool in xodo looks like a extra layer above the area (I hv tried in various opacity). But foxit area highlight tool looks like exactly same as we highlight text in a unflattened pdf.