What delimiter does the converter expect?

The comma (,) is the standard CSV delimiter and is what the parser expects by default. If your export actually uses semicolons (common in European locale exports from some accounting software) or tabs, convert the delimiter to a comma first in a text editor, or rename a tab-separated file to .tsv and adjust before uploading.

Will numbers actually behave like numbers in Excel?

Yes. Each column is inspected and numeric-looking values are written as native Excel numbers, not text strings that merely display as digits. That means you can immediately sum a column, sort it numerically, or reference it in a formula without first running Excel's "Convert Text to Columns" trick.

What happens to leading zeros, like in ZIP codes or account numbers?

Values that are clearly meant to stay as codes (rather than arithmetic quantities) are kept as text so a ZIP code like "07030" doesn't get silently converted to the number 7030. If a specific column is misdetected, you can reformat that column's cells as Text in Excel after opening the file.

My CSV has accented characters or a foreign currency symbol — will they show correctly?

UTF-8 encoded files are fully supported and display correctly. Very old exports saved in Windows-1252 or Latin-1 encoding can show garbled characters (question marks or odd symbols in place of accents) — re-save the source file as UTF-8 in a text editor like Notepad++ or VS Code before converting.

Can I convert several CSV files into one workbook with multiple sheets?

This tool converts one CSV per pass, producing one single-sheet workbook. After downloading, drop the next CSV to produce another XLSX. If you need everything combined into one multi-sheet workbook, open both resulting files in Excel and drag the sheet tabs into a single workbook.

Are my dates going to come out right?

Dates in an unambiguous format like YYYY-MM-DD are generally recognized correctly. Ambiguous formats like 03/04/2024 can be interpreted as either March 4th or April 3rd depending on locale — if date accuracy matters, check a few rows after conversion and reformat the column in Excel if needed.

Is there a row or column limit I should know about?

Excel workbooks support up to 1,048,576 rows and 16,384 columns per sheet. Any CSV within those bounds converts without issue; a CSV that exceeds the row limit will need to be split into multiple files first.

Is my CSV data uploaded to a server anywhere?

No. The entire parse-and-write process runs locally using SheetJS in your browser tab. The file never leaves your device, which matters if your CSV contains customer records, financial data, or anything else you'd rather not hand to a third-party server.

Can I convert a TSV (tab-separated) file with this tool?

The tool is built around comma-delimited files. For a genuine tab-separated export, open it in a text editor, replace tabs with commas (being careful of any commas already inside values), save as .csv, then convert.

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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CSV to Excel

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What is CSV to Excel?

CSV to Excel takes a plain-text comma-separated values file and turns it into a proper Microsoft Excel workbook (.xlsx) with typed cells instead of raw text strings. A CSV file has no concept of a number, a date, or a formula — every value, whether it reads "42", "1,204.50", or "2024-03-01", is stored as a sequence of characters and nothing more. XLSX is a structured format (technically a ZIP archive of XML parts) where each cell carries an actual data type, so the moment you open the converted file, numbers align to the right, sort numerically instead of alphabetically, and are ready to sit inside a =SUM() or =AVERAGE() formula without you retyping anything.

This matters more than it sounds. Anyone who has pasted a raw CSV export into Excel manually knows the annoyance of leading zeros disappearing from ZIP codes, order numbers turning into scientific notation, or a "Yes"/"No" column being treated as text you can't filter numerically. Converting properly, with column-by-column type detection, avoids that guesswork entirely — the tool looks at every value in a column and decides whether it should land as an integer, a decimal, or plain text before writing the workbook.

CSV files show up constantly as the lowest-common-denominator export format: databases dump to CSV, payment processors send CSV settlement reports, and most CRMs offer CSV as the safest export option because it has no proprietary formatting to break. But a plain CSV is hard to work with directly — no bold headers, no frozen panes, no conditional formatting, no charts. Converting to XLSX is usually the very first step before anyone actually does anything useful with the data in a spreadsheet program.

How It Works

Drop your .csv file and SheetJS parses it entirely inside your browser tab. Each column is scanned so numeric-looking values are written as real numbers (not text-that-looks-like-a-number), while everything else is kept as a text cell. The parser also respects RFC 4180 quoting rules, so values containing embedded commas, line breaks, or quote characters inside quoted fields are read correctly instead of being split into the wrong columns. The result is written as a single-sheet .xlsx workbook named after your original file and downloaded straight to your device — nothing is sent anywhere for processing.

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
Column-by-column numeric detection — stored as real numbers, not text
Sheet is named after your source CSV file
Handles commas, line breaks, and quotes inside cell values per RFC 4180
No loss of leading zeros or precision from raw text values
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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