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Convert CSV to Excel

Turn a CSV or TSV file into an XLSX workbook with typed numbers and dates, including Cyrillic Windows-1251 exports; it is converted on your device.

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Drop a CSV, Excel or JSON fileCSV, TSV, XLSX, XLS, ODS, JSON · up to 500 MB
Choose fileProcessed on your device — never uploaded
Runs in your browser · no uploadHow it works

How to use CSV to Excel

  1. 1

    Drop the CSV

    A .csv, .tsv or .txt export. The delimiter and the text encoding are detected; change them in the input options if the preview looks wrong.

  2. 2

    Check the columns

    The preview shows how each value was read; keep “Detect numbers, true/false and dates” on to get typed cells.

  3. 3

    Download the workbook

    Excel is preselected; download the .xlsx, or choose ODS for LibreOffice.

Limits and Pro

CSV and TSV files up to 500 MB; Excel itself opens at most 1,048,576 rows per sheet.

Files up to 4 GB. See Pro

About CSV to Excel

CSV to Excel turns a comma-, semicolon-, tab- or pipe-separated export into a real XLSX workbook. Opening a CSV directly in Excel lets Excel guess, and it often guesses wrong: account numbers lose their leading zeros, long IDs turn into 1.23E+15, dates flip between day and month, and Cyrillic text from an older program turns into Ïðèâåò. Converting first gives you a file that opens the same way on every computer.

The text encoding is read before anything else. UTF-8 with or without a byte-order mark and UTF-16 are recognized from the bytes; files that aren't Unicode are treated as Windows-1251 when most letters are Cyrillic and as Windows-1252 otherwise, and you can force either in the input options — useful for 1C reports and bank statements.

Type detection writes whole and decimal numbers (with a dot as the decimal point) as numeric cells, true and false as logical cells and ISO dates such as 2024-03-31 as date cells. Values that only look like numbers stay text: codes with leading zeros, numbers longer than 15 digits, and amounts written with a decimal comma such as 1250,50. Columns get widths that fit their content, and the first row becomes the header unless you turn that off.

The workbook has a single sheet. Quoted fields with commas, quotes and line breaks inside are read according to RFC 4180, so multi-line notes stay in one cell.

Privacy

The CSV is decoded, parsed and written as XLSX by a Web Worker inside this tab using Papa Parse and SheetJS; the data isn't uploaded or stored anywhere.

CSV to Excel: frequently asked questions

Why do numbers like 007 or long IDs stay as text?
Because turning them into numbers would change them: a number cell can't keep the leading zeros of 007, and Excel can only store 15 significant digits, so a 16-digit card or account number would be rounded. Such values are written as text cells, which keeps them exactly as they appear in the CSV.
My CSV is in Russian or Uzbek Cyrillic and shows strange symbols. Can I fix that?
Yes. Files from older programs are often saved in Windows-1251 rather than UTF-8. It is usually recognized on its own — the Text encoding box then says “Detect (found Windows-1251)”. If the preview still shows symbols such as Ïðèâåò, pick Windows-1251 by hand and the Cyrillic text appears correctly in the workbook.
Does a semicolon-separated CSV work?
Yes, semicolons are detected like commas, tabs and pipes, and you can choose the delimiter yourself. One thing to know: numbers written with a decimal comma, such as 1250,50, are kept as text cells rather than numbers. Replace the commas with dots first if those amounts have to be summed in Excel.
Are dates converted to Excel dates?
Dates written in ISO form — 2024-03-31, or 2024-03-31 14:30 with a time — become real date cells you can sort and filter. Other styles such as 31.03.2024 or 03/31/2024 stay text, because the same digits mean different dates in different countries, and a wrong guess would be worse than none.
Can I split a CSV that is too big for Excel?
This page converts the whole file into one sheet, and Excel stops at 1,048,576 rows. For longer files use Split CSV or Excel, which cuts the file into several parts of the size you choose — each with the header row — and can save them as Excel files or as the sheets of one workbook.

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