Spreadsheets
Convert spreadsheets to and from CSV, JSON, and XLSX.
XLSX to CSV converter
Export one worksheet, or every worksheet, from an Excel workbook as CSV.
XLSX to JSON converter
Turn a worksheet into an array of JSON objects, with control over blank cells.
CSV to XLSX converter
Turn a CSV file into a real Excel workbook with a worksheet you name.
JSON to XLSX converter
Turn an array of JSON objects into an Excel workbook, one row per object.
About these tools
Convert workbooks to and from CSV, JSON, and XLSX without installing Excel or sending a file to a website. The workbook is parsed in your browser, so financial models, payroll exports, and customer lists stay on your machine.
A spreadsheet is not a flat table, and these tools are explicit about that: you choose which worksheet to export, and each tool's page states what happens to formulas, formatting, and dates.
Frequently asked questions
- Can I convert Excel to CSV without Excel?
- Yes. Open the XLSX to CSV converter, choose your workbook, and pick the worksheet you want. No spreadsheet application is involved and nothing is uploaded, which is the usual reason people look for a converter in the first place.
- What happens to my formulas?
- The calculated values are exported, not the formulas. CSV and JSON have no concept of a formula, so what you get is the numbers the workbook was showing. If you need the formulas themselves, keep the .xlsx.
- Does it handle workbooks with several worksheets?
- Yes. The tool reads the workbook first and lets you choose which sheet to export, because guessing wrong on a workbook with a summary tab and twelve monthly tabs is worse than asking.
- Are my dates converted correctly?
- Yes, and this is a place many converters get it wrong. Spreadsheet dates are stored as numbers, and converting them through a timezone can shift them by a day. These tools format dates from their own components, so a date exported in Sydney is the same date it was in the workbook.
- Does it support old .xls files?
- The tools target .xlsx, the format Excel has produced by default since 2007. If you have a legacy .xls, open it in any spreadsheet application and save it as .xlsx first.
- Is my workbook uploaded anywhere?
- No. The spreadsheet engine is JavaScript that runs in your browser. Your workbook is read from disk into memory, converted, and released. Nothing is transmitted and nothing is stored.
- What about formatting, colours, and merged cells?
- They do not survive, because CSV and JSON cannot express them. What you get is the data. If the presentation matters, keep the original workbook alongside the export.