Perkforge
How it works
Choose or paste a CSV file, select its delimiter, convert it and review the first rows before downloading XLSX. Nothing is uploaded and no account is required.
Useful to know
The first CSV row becomes the spreadsheet header. Values are preserved as text so leading zeros remain intact and formula-like input cannot execute. The output uses a simple unformatted worksheet.
Private by design
Inputs, selected files and results stay inside your browser. Perkforge does not receive the content you process with this tool.