You may copy data from Excel, Google sheets or any tool that separate row with Tab or comma or spaces and Line Feed (Enter) between the rows .
Copy the data, one block of consecutive columns includes the header, and paste below. Y columns must be in the right. . click to see example:
The tool was tested successfully with a data block of 200 columns with 124 ten digits numbers, in Google Chrom and Firefox. If having any problem to paste a big block, please use browser's incognito mode.