Is GradePaste by Positive Physics safe?

Paste a single copied column of grades into compatible online grade books.

This extension lets you copy a column of numeric grades from a spreadsheet or compatible app and paste it into Google Classroom, Canvas, Schoology, or PowerSchool. It supports one column at a time and can convert pasted percentages into points, including values with percent signs or decimals from 0.00 to 1.00.