CSV Preview opens a .csv file — or pasted clipboard text — into a sortable, filterable grid that never touches a server: no upload, no account, no signup. Click a header to sort a column, filter rows by value or by comparing numbers, and pin the first row while you scroll; the sheet persists locally, so closing the tab doesn’t lose your place. Built solo after its developer noticed jsonhero.io had no CSV equivalent, it also ships free CSV-to-Excel and Excel-to-CSV converters that run the same way.