Convert Excel and CSV files
Converting between CSV and Excel looks simple until the leading zeros disappear from your product codes, accented names turn into gibberish or a long account number becomes 1.23E+15. These converters read and write files carefully so your data comes out exactly as it went in.
CSV files are saved as UTF-8 with a byte order mark so Excel shows every character correctly, and codes such as 00123 stay as text. Conversion happens inside your browser: the file is never uploaded anywhere.
5tools available
CSV to Excel
Convert CSV files to XLSX with correct characters and leading zeros.
Excel to CSV
Save any sheet as a UTF-8 CSV that opens cleanly everywhere.
XLS to XLSX
Upgrade old .xls workbooks to the modern .xlsx format.
Excel to JSON
Turn a sheet into a JSON array of objects keyed by header.
JSON to Excel
Turn a JSON array of flat objects into a spreadsheet.