What delimiter is supported?

Comma (,) is the standard CSV delimiter and is fully supported. If your file uses semicolons or tabs, rename the extension to .tsv or manually convert the delimiter first.

Are numbers treated as numbers or text?

Numbers are automatically detected and stored as numeric cells in the XLSX. This allows sorting, summing, and using Excel formulas on them.

What if my CSV has special characters?

UTF-8 encoding is fully supported. Very old files in Windows-1252 may have garbled characters — save them as UTF-8 first using a text editor.

Can I convert multiple CSV files at once?

One file at a time. After downloading, drag a new CSV to convert another.

Is there a row or column limit?

Excel supports up to 1,048,576 rows and 16,384 columns. Files within those limits work fine.

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All ToolsCSV to Excel

CSV to Excel

Convert CSV files to Microsoft Excel XLSX spreadsheets. Numbers auto-detected, sheet named from your file. Runs entirely in your browser.

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Drop a .csv file or browse

Comma-separated values file

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What is CSV to Excel?

CSV to Excel converts comma-separated values files into Microsoft Excel XLSX spreadsheets. Numbers are automatically detected and stored as numeric cells for easy sorting and calculation.

How It Works

Drop your .csv file. SheetJS parses the CSV, auto-detects numeric columns, and writes an XLSX file with a single sheet named after your file — entirely in your browser. Nothing is uploaded.

How to Use

1
Upload your CSV file
Drop a .csv file onto the upload zone. The file is parsed in your browser.
2
Set delimiter (optional)
If your CSV uses a semicolon or tab instead of a comma, select the correct delimiter.
3
Convert
Click "Convert to Excel". The CSV data is imported into a single-sheet XLSX workbook.
4
Download
Save the .xlsx file and open it in Microsoft Excel, Google Sheets, or LibreOffice Calc.
5
Apply formatting
In Excel, you can now add headers, apply number formats, create charts, and use formulas on your data.

Who Uses This Tool

📊

Data Analysis

Convert raw CSV data exports from databases or APIs into Excel so you can apply PivotTables, charts, and formulas.

💼

Business Reports

Turn CSV reports from accounting, CRM, or ERP systems into formatted Excel workbooks for management review.

🛒

E-Commerce Exports

Convert product or order CSV exports from Shopify, WooCommerce, or Amazon Seller Central into Excel spreadsheets.

🔬

Research Data

Import CSV data collected from surveys or instruments into Excel for statistical analysis and chart generation.

📬

Email Marketing

Convert email list CSV files to Excel for segmentation, filtering, and preparation before import into marketing tools.

🤝

Client Handoff

Deliver Excel files to clients instead of raw CSV when they need formatted, ready-to-use spreadsheets.

Why Choose This Tool

Numeric Auto-Detection

Numbers are automatically stored as numeric cells in the XLSX, not as text, so sorting and formulas work immediately.

Browser-Only Processing

SheetJS parses your CSV and generates the XLSX entirely in your browser — your data is never uploaded.

RFC 4180 Compliant

Commas and quote characters inside cell values are handled correctly following the CSV standard.

Named Sheet

The worksheet is named after your CSV filename, making it easy to identify when added to a multi-sheet workbook later.

Excel Row Limits Respected

The tool works within Excel's 1,048,576-row limit and warns you if your CSV approaches that boundary.

Free to Start — Sign Up for More

Use free with no account for standard file sizes. Sign up free to raise your limit to 80 MB, or upgrade to Pro for 250 MB per file.

Also Try

Excel to CSV Excel to PDF XLS to XLSX ODS to Excel PDF to Excel JSON Formatter

Key Benefits

100% browser-based — your files never leave your device
Numeric values auto-detected — stored as numbers, not text
Sheet is named after your CSV file
Handles commas and quotes inside cell values (RFC 4180)
Free up to 40 MB — sign up free for 80 MB, upgrade to Pro for 250 MB

Frequently Asked Questions

Also Known As

csv to excel converter free onlineconvert csv file to xlsx spreadsheetcsv to excel browser based no uploadimport csv into excel free toolcsv to xlsx with number detectioncsv to excel free no installconvert comma separated file to excel

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