CSV to Excel

Turn CSV exports into proper Excel workbooks, with numbers recognized and each file on its own sheet if you like.

Private by design. Your files are processed on this device and never uploaded. No account, no watermark, no limits.

How to use CSV to Excel

  1. Drop one or more .csv or .tsv files
  2. Choose the delimiter (auto-detect works for most) and whether to combine files into one workbook
  3. Click Convert and download the .xlsx

About this tool

Opening a CSV directly in Excel can mangle data: leading zeros vanish from ZIP codes, long IDs turn into scientific notation, and UTF-8 accents break. Converting with the SheetJS engine keeps the text you see and lets you keep numeric-looking values as text when you need to.

Frequently asked questions

How do I keep leading zeros?

Turn on “Keep values as text”. Every cell is stored as text, exactly as it appears in the CSV.

Which delimiters are supported?

Comma, semicolon, tab and pipe. Auto-detect checks the first lines.

Can I combine several CSVs?

Yes. Turn on “Combine into one workbook” and each CSV becomes a sheet.

Are my files uploaded to a server?

No. ConvertBrightly processes files with JavaScript inside your browser. Nothing is sent over the network, and the files disappear when you close the tab. You can even disconnect from the internet after the page loads.

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