CSV to Excel Converter
Wrap CSV data into an .xlsx file for better editing and analysis.
- CSV
- up to 200 MB per file
- Never uploaded
What CSV to Excel does
Convert CSV into a real Excel workbook. CSV holds values and nothing else — no formulas, no formatting, no column widths, no multiple sheets. Saving it as .xlsx gives you a file that can carry all of that, and stops Excel mangling things like leading zeros and dates every time the CSV is reopened.
The CSV is parsed in your browser with SheetJS and written to a single sheet named Sheet1. Every value is kept as text exactly as it appears in the file — "007" stays "007", a 16-digit card number is not rounded, and "1/2" is not turned into a date. That is the opposite of what happens when you open a CSV directly in Excel, and it is deliberate: you can convert columns to numbers or dates inside Excel afterwards, but you cannot get a destroyed leading zero back.
The delimiter is detected from the first lines (comma, semicolon or tab). A file with an inconsistent number of fields per row still converts; short rows leave trailing cells empty. Column widths are Excel's defaults, and there is no header styling — the first row is data like any other.
How it works
- 01
Upload CSV
Choose the .csv; the delimiter is detected automatically.
- 02
Convert
DocsBolt wraps data into an Excel workbook.
- 03
Download
Get a .xlsx with typed cells — numbers as numbers, dates as dates.
Formats and limits
- Accepts
- .csv
- Produces
- Excel (.xlsx)
- Files per run
- One
- Size limit
- 200 MB per file
When you'd use it
- A CSV export whose leading-zero IDs Excel keeps breaking
- Building a workbook from a system export without re-importing
- Sending data to someone who expects an .xlsx
Limitations
- Values are typed by inspection: numbers and ISO dates become numbers and dates, everything else stays text. A column of postcodes with leading zeros should be quoted in the CSV or it becomes numbers.
- One CSV becomes one sheet; the delimiter is detected from the first lines (comma, semicolon or tab).
Questions
Does this handle commas in data?
Yes, standard CSV parsing handles quoted fields.
Will this stop Excel destroying my ID numbers?
It helps considerably. CSV has no type information, so Excel guesses on every open and strips leading zeros or reformats codes as dates. An .xlsx stores the cell type explicitly, so the values stay put.
Can I add formulas afterwards?
Yes — the output is a normal Excel workbook, so formulas, charts, conditional formatting and extra sheets all work as usual.
Are delimiters other than commas handled?
Common delimiters including semicolons and tabs are detected. Semicolon-separated files are standard in several European locales and convert without special handling.
What happens to your file
Your file is never uploaded or stored.
Full detail in the Privacy Policy.
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