CSV to Excel Converter

Turn CSV files into formatted Excel .xlsx workbooks.

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What Does the CSV to Excel Converter Do?

This converter turns CSV data — pasted or uploaded — into a native Excel workbook (.xlsx) with sensible formatting applied automatically: the header row is bold, columns are auto-sized to their content, numeric values become real Excel numbers (so SUM and pivot tables work immediately) while codes with leading zeros stay text and keep their zeros. Semicolon, tab and pipe delimiters are supported alongside commas.

How to Convert CSV to Excel

  1. Paste your CSV or upload a .csv file (up to 20 MB).
  2. Choose the delimiter and whether the first row is a header.
  3. Click Convert to Excel — a formatted .xlsx downloads immediately.

Why Not Just Open the CSV in Excel?

  • Encoding disasters — double-clicking a UTF-8 CSV often mangles accents into é gibberish. The converter handles encoding correctly every time.
  • Leading zeros — Excel silently turns ZIP code 01234 into 1234 when opening CSV directly; the converter protects such values as text.
  • Wrong delimiter guesses — regional Excel versions guess separators differently; here you choose explicitly.
  • Instant polish — bold headers and fitted columns beat the unformatted wall of text you get from a raw open.

Perfect for turning exports from databases, APIs and legacy systems into workbooks ready to share with people who live in Excel.

Frequently Asked Questions

Will leading zeros in codes be preserved?

Yes — values with leading zeros (like 01234) and very long digit strings are stored as text cells, so Excel cannot strip zeros or convert IDs to scientific notation. Ordinary numbers become real numeric cells.

My CSV uses semicolons — is that supported?

Yes. Choose "Semicolon (;)" in the delimiter dropdown — common for European Excel exports. Tab and pipe separators are also available.

How large a CSV can I convert?

Up to 20 MB and 100,000 rows — enough for most exports. Beyond that, split the file; Excel itself gets sluggish past that scale anyway.

Is my data kept on the server?

No. The workbook is generated in memory, streamed to your download, and every temporary file is deleted immediately afterwards.