Excel to CSV Converter.

Upload your .xlsx or .xls file using the file upload area above, then click Convert. The tool extracts data from the first sheet and converts it to clean CSV format. Download the .csv file or copy the output. All processing is client-side — your spreadsheet data never leaves your device.

Use the CSV to Excel converter on this site. Paste your CSV or upload a .csv file, click Convert, and download the .xlsx. The resulting file opens in any spreadsheet application with proper column formatting and data types preserved.

In Excel: File → Save As → choose CSV (Comma delimited) (*.csv) from the format dropdown. Note that CSV only saves the active sheet, strips all formatting, and converts formulas to their current values. For a web-based alternative that doesn't require Excel, upload your .xlsx to jsontofile.com and download the CSV.

Use Data → From Text/CSV for the best results — this opens Power Query with a preview where you can set delimiters and data types before loading. Double-clicking a .csv opens it directly but may misinterpret data types (leading zeros get dropped, dates may shift formats). For problematic CSV files, convert them to .xlsx on jsontofile.com first, then open the Excel file cleanly.

Enter data in Excel, then File → Save As → choose CSV UTF-8 (Comma delimited) for international character support. Only the active sheet is saved; formulas become values; formatting, charts, and multiple sheets are discarded. For data you plan to re-import, keep an .xlsx master copy and export CSV as needed.

Data → From Text/CSV → select your file → preview appears. Set the delimiter (usually comma), adjust data type detection, then click Load. For recurring imports, save the Power Query connection and set auto-refresh. To bypass Excel's data type guessing entirely, convert CSV to .xlsx on jsontofile.com and open the Excel file directly.

When importing CSV into Excel, use Data → From Text/CSV (not File → Open) and set the column's data type to Text in the Power Query preview. This preserves leading zeros, postal codes, and ID numbers. If you're creating the CSV, wrap values in double quotes or prefix with a tab character. For reliable results, convert CSV to .xlsx on jsontofile.com — the converter preserves all data exactly as-is.

The simplest method: paste your CSV into the converter above, click Convert, and download the .xlsx file. It opens directly in Excel with proper formatting. Alternative methods: open the CSV in Excel and save as .xlsx (File → Save As → Excel Workbook), or use the Power Query import method for more control over data types.