Import .csv file to server

I am performing a task to import data from a .csv file to the server. I can already import the file all right on the server side, however each file contains about 25,000 records and the user is waiting until the upload is complete. I put a simple load on the page while the user waits. But I would like to know if you have any library that creates a bar with upload status so the user knows how much time remains to finalize the upload.