CSVCSV Dock

Private, local-first data tools

Convert Excel to CSV

Open XLSX or XLS locally, select the worksheet you need, or download every sheet as separate CSV files in one ZIP.

Processed in your browserNo account requiredEncoding and delimiter controlsIncomplete exports are blocked
CSV export options
Drop a file, paste data, load a CORS-enabled URL, or try the sample.
Rows0
Columns0
EncodingAuto
DelimiterAuto
Issue groups0

Open a data file to start

The parser runs off the main thread. Once loaded, you can search, sort, validate, repair and export without an account.

What this tool does

Convert Excel to CSV

The Excel reader loads only after you choose a workbook. It lists all worksheet names, previews the selected sheet and lets you save that Excel sheet as a CSV file or package every worksheet as a separate CSV file.

How to use it

  1. Choose an XLSX or XLS workbook from your device.
  2. Select a worksheet and inspect the values that will be written to CSV.
  3. Download the current worksheet or export all worksheets as a ZIP archive.

Common tasks

  • Save or export an XLSX or legacy XLS worksheet as CSV without opening Excel or uploading the workbook.
  • Choose one Excel sheet and preview its stored values before export.
  • Export every worksheet as a separate CSV inside one ZIP file.

Privacy and local processing

Local files are read by a dedicated browser worker and are not uploaded to an application server. File contents and filenames are not included in analytics events. Loading a public URL is an explicit direct request from your browser and may fail when the remote server blocks CORS.

Supported edge cases

  • CSV has no worksheets, styling, formulas or merged-cell model.
  • The exported CSV contains displayed formula values rather than an Excel formula engine.
  • Empty cells are preserved as empty fields and all-sheet filenames are sanitized for ZIP export.

Frequently asked questions

How do I save an Excel file as a CSV?

To save an Excel file as a CSV or export an Excel file to CSV, choose the XLSX or XLS file, select the worksheet and inspect its stored values, then download that sheet. You can create a CSV file from the selected Excel worksheet, or download every sheet in one ZIP.

Can one CSV contain multiple Excel sheets?

No. CSV has no sheet concept. Select one worksheet or download all worksheets as separate CSV files in a ZIP.

Are Excel formulas recalculated?

No. The converter reads the values stored in the workbook; it does not run Excel's calculation engine.

Does it support old XLS files?

Yes. Both XLSX and legacy XLS files can be opened in the browser.

Related CSV tools

Convert CSV to ExcelConvert CSV to Excel XLSX or XLS locally in your browser. Preserve leading zeros, inspect delimiters and download without uploading your data.CSV Validator and CheckerValidate CSV structure locally. Find duplicate headers, inconsistent rows, quote problems, invisible characters and download an error report.Merge CSV FilesMerge multiple CSV files in your browser by header name or position. Use union or common columns and optionally add the source filename.Online CSV ViewerOpen, search, sort and inspect CSV files in your browser. Detect encoding and delimiters without uploading your data or creating an account.