ToolRecipe
Stays on this device No watermark Works offline

What do you need to get done?

Drop a file here

or .

/

Open an app

Follow a recipe

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Use one tool

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XLS to XLSX

Convert XLS to XLSX online and for free, without an account. Add your file, pick the format to convert to and save the result. Nothing is uploaded: the conversion runs in your browser.

How to convert XLS to XLSX

  1. 1Drop your XLS file in, or click to choose it
  2. 2Check that the format to convert to is XLSX
  3. 3Start the conversion and save the XLSX file
  4. Your spreadsheet as XLSX, saved on your device.

What happens to your files

  • Nothing is uploaded.Your XLS file is read and converted by your browser, on your own device.
  • Free, no account.You do not sign up for anything and you install nothing.
  • No Excel needed.You need neither Excel nor LibreOffice to convert XLS to XLSX.

What you can do

  • Convert XLS to XLSX and save the result as a file on your device.
  • Read Excel (xlsx, xls), OpenDocument, Numbers, CSV, TSV and JSON, and write Excel, OpenDocument, CSV, JSON and PDF.
  • Convert a workbook with several sheets: you get every sheet, or just the one you pick.
  • Open a CSV with semicolons, as German Excel writes it. The separator is recognized, and decimal commas such as 1.234,56 become numbers.
  • Keep formulas when you save as Excel or OpenDocument.

Good to know

  • The binary Excel format of Excel 97 to 2003. Limited to 65,536 rows and 256 columns; newer files use XLSX.
  • The Excel format since 2007: a ZIP of XML files that keeps formulas, several sheets and up to 1,048,576 rows per sheet.
  • CSV, JSON and PDF get the values of formulas, not the formulas. Excel and OpenDocument files keep the formulas.
  • A workbook with several sheets becomes one CSV file per sheet, or one JSON object with a key for each sheet.
  • A JSON file is read as a table: nested objects become columns named like a.b.
  • The page has no upload, so there is nothing to delete afterwards.

Questions

Is my XLS file uploaded to a server?

No. The file is read and converted by your browser on your own device. It is never sent to us or anyone else.

Can I convert XLS to XLSX without Excel?

Yes. The conversion runs in your browser, so you need no Excel, LibreOffice or other spreadsheet program.

What happens to formulas?

Excel and OpenDocument files keep them. CSV, JSON and PDF get the last calculated value of each cell.

Is it free?

Yes. It is free, with no account and no sign-up.

Related tools

How it works

Small tools that run in your browser.

Four steps

  1. Start with a file or a task

    Drop a file, search, or pick a task.

  2. The tool opens in a window

    Open as many as you like, side by side as tabs.

  3. Results collect on the right

    Drag a result into the next tool.

  4. Save when you're done

    Saved files go to your downloads.

Who uses what

Tool sets for common jobs.

Put a tool on your home screen

The icon opens that tool, like an app.

iPhone and iPad

  1. Open the tool in Safari.
  2. Tap Share (the square with the arrow).
  3. Choose “Add to Home Screen”, then Add.

Android

  1. Open the tool in Chrome.
  2. Tap the menu (⋮) at the top right.
  3. Choose “Add to Home screen” or “Install app”.

Computer

  1. Open the tool in Chrome or Edge.
  2. Click the install icon in the address bar.
  3. Choose Install.

Skills

Claude skills we use ourselves, one job each.