Convert a CSV file into a real Excel workbook (.xlsx) with separated columns and leading zeros preserved.
About CSV to Excel
Opening a CSV directly in Excel often goes wrong: every row lands in a single cell because the separator is a semicolon, ZIP codes such as 08001 lose their leading zero, and accented characters turn into symbols. This converter reads the CSV properly and writes a native .xlsx workbook, so Excel opens it with one value per column and the original text intact.
Upload the file or paste its content, check the preview, and download the Excel file. The whole conversion happens in your browser with the SheetJS engine, which means a 50 MB export from your CRM never leaves your computer.
How to use CSV to Excel step by step
Drag your .csv, .txt or .tsv file onto the upload area, or paste the CSV text into the box below it.
Check the preview: it shows the detected separator and the first rows split into columns. If the split looks wrong, pick the separator by hand (comma, semicolon, tab or pipe).
Optionally change the Excel file name and the sheet name, and decide whether numeric values should become numeric cells.
Click "Convert and download Excel". The .xlsx file downloads immediately, with column widths adjusted to the content.
100% free and online: no payments, no software or extensions to install.
Privacy-first: processing happens in your browser, your data never leaves your device.
No sign-up: paste your data and get the result in one click.
Fast and reliable: handle small or large files in seconds, ready for Excel and other tools.
Common use cases
Turn a CSV exported from Shopify, WooCommerce or a bank into a spreadsheet you can filter, sort and share with colleagues who only use Excel.
Fix a CSV that Excel opens as a single column because it uses semicolons or tabs as separators.
Deliver reports to clients as .xlsx instead of raw CSV, keeping product codes, phone numbers and ZIP codes exactly as written.
Convert log files or database dumps in CSV format into a workbook before building pivot tables or charts.
Limits and tips
Values with leading zeros (08001, 007, 0034612345678) are always stored as text so Excel does not strip the zeros. Uncheck "Convert numbers to numeric cells" if you want every value kept as text.
Excel limits a sheet to 1,048,576 rows and 16,384 columns. Larger CSV files should be split first with the Split CSV tool.
The first row is treated as the header and is never converted to numbers, even if it only contains digits.
Sheet names cannot contain the characters \ / ? * [ ] : and are cut to 31 characters, which is the Excel limit.
Frequently asked questions
Why does Excel put my whole CSV in one column?
Excel splits columns using the list separator of your Windows region. In Spain, France or Germany that is the semicolon, so a comma-separated CSV opens as a single column. This converter detects the separator itself and writes a real .xlsx, so the problem disappears.
Will my leading zeros be preserved?
Yes. Any value that starts with a zero and is not simply "0" is written as a text cell, so ZIP codes, account numbers and product codes keep their zeros.
Does the CSV get uploaded to a server?
No. The file is read and converted with JavaScript inside your browser. Nothing is sent to csvcreator.com or any third party, which makes the tool safe for customer lists and financial data.
What is the difference between CSV and XLSX?
CSV is plain text with one record per line and a separator between values; it has no formatting, no data types and a single table. XLSX is the Excel workbook format: it stores multiple sheets, cell types (number, text, date), column widths and styles in a compressed XML package.
Can I convert a CSV with accents or non-Latin characters?
Yes. The converter reads the text as UTF-8, so Spanish accents, Thai, Vietnamese or Cyrillic characters are written to the Excel file exactly as they appear in the CSV.
Related guides
Convert CSV to Excel: 5 ways, from double-click to Python — Five ways to convert a CSV file to Excel: Excel's import wizard, Google Sheets, LibreOffice, Python with pandas, and an online converter. When each one fits, and how to keep leading zeros and accents.