CSV to Excel Converter

Convert CSV files to Excel XLSX format online for free. Get formatted spreadsheets with proper columns, ready for formulas and charts. No software needed. Up to 100 MB.

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Tap to choose your CSV file

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Also supports TSV, TXT, XLS, ODS • Max 100 MB

Your files are secure. All uploads encrypted via HTTPS. Files automatically deleted from our servers within 2 hours.

How to Convert CSV to Excel

1

Upload

Drag and drop your CSV file into the converter above, or click Choose CSV File to browse your device.

2

Convert

Click Convert to XLSX. Our server transforms your CSV data into an Excel spreadsheet. Takes a few seconds depending on file size.

3

Download

Click Download XLSX to save the Excel file. That's it — no registration, no email required.

What is CSV?

CSV (Comma-Separated Values) is a plain-text file format that stores tabular data — rows and columns — using commas as delimiters between fields and line breaks between records. It is one of the oldest and most universal data exchange formats in computing, supported by virtually every spreadsheet application, database, programming language, and data analysis tool.

A CSV file contains no formatting, no formulas, and no data type information. Every value is stored as plain text. This simplicity is both its greatest strength and its main limitation: CSV files can be opened and processed anywhere, but they cannot represent the rich features of modern spreadsheets like cell formatting, charts, or multiple worksheets.

CSV is the standard for data interchange between systems. Database exports, API responses, CRM exports, analytics reports, and scientific datasets are commonly distributed as CSV files because any software can read them without special libraries or proprietary codecs.

Why Convert CSV to Excel?

While CSV is perfect for storing and transferring raw data, Excel (XLSX) is the tool for working with that data. Converting CSV to Excel unlocks features that plain text simply cannot provide: cell formatting, conditional formatting, formulas, pivot tables, charts, data validation, filtering, sorting, and multiple sheets within a single file.

Excel automatically organizes your CSV data into properly separated columns, making it immediately readable. You can then apply number formats (currency, percentages, dates), create formulas to calculate totals and averages, build charts to visualize trends, and use filters to analyze subsets of your data — none of which is possible in a raw CSV file.

For business users, analysts, and anyone who needs to present, analyze, or share data with non-technical stakeholders, Excel is the expected format. A well-formatted Excel file communicates information far more effectively than a wall of comma-separated text.

CSV vs Excel: Quick Comparison

Feature CSV Excel (XLSX)
File type Plain text Binary (XML-based ZIP archive)
Data types Everything is text Numbers, dates, text, booleans, formulas
Cell formatting None Fonts, colors, borders, conditional formatting
Formulas Not supported Full formula engine (SUM, VLOOKUP, etc.)
Charts & graphs Not supported Built-in chart creation
Multiple sheets Single table only Multiple worksheets in one file
Filtering & sorting Requires external tools Built-in AutoFilter, sorting, pivot tables
File size Smaller (plain text) Larger (but compressed XML)
Compatibility Universal (any text editor, any OS) Excel, Google Sheets, LibreOffice
Data validation None Dropdown lists, input rules, error checking
Best for Data exchange, imports, automation Analysis, reports, presentations, sharing

Open Your Converted Excel File on Any Device

On Windows

The XLSX file opens directly in Microsoft Excel, which is the native application for this format. If you don't have Excel installed, you can use the free LibreOffice Calc or upload the file to Google Sheets. Windows also includes a built-in preview for XLSX files in File Explorer. For quick viewing without editing, Microsoft's free Excel Viewer or the Office web apps at office.com work perfectly.

On Mac

macOS supports XLSX files through Microsoft Excel for Mac, Apple Numbers (pre-installed on all Macs), and LibreOffice Calc. Numbers handles most Excel features well, including formulas and basic charts. For full Excel compatibility — especially with complex formulas, pivot tables, or macros — Microsoft Excel for Mac is the recommended option. You can also open XLSX files directly in Google Sheets through your browser.

On Linux

LibreOffice Calc is the standard spreadsheet application on Linux and handles XLSX files with excellent compatibility. It comes pre-installed on most Linux distributions (Ubuntu, Fedora, Linux Mint). LibreOffice supports Excel formulas, formatting, charts, and multiple sheets. For a web-based alternative, Google Sheets works in any Linux browser and provides full XLSX import/export capabilities.

On Mobile (iOS & Android)

On iOS, the XLSX file opens in Apple Numbers (pre-installed) or the free Microsoft Excel app. On Android, Google Sheets (pre-installed on most devices) handles XLSX natively, and the free Microsoft Excel app is available from the Play Store. Both platforms let you view, edit, and share Excel files on the go. For quick viewing, most file manager apps on both platforms can preview XLSX files.

Frequently Asked Questions

Yes. Every row and column from your CSV file is transferred to the Excel spreadsheet without any data loss. Text, numbers, and dates are all preserved exactly as they appear in the original CSV. The converter reads your CSV structure and maps each field into the corresponding Excel cell, maintaining the exact same data layout.
Our converter handles UTF-8 encoded CSV files, which covers virtually all languages and special characters including accented letters, CJK characters, currency symbols, and emoji. If your CSV was exported from a database, spreadsheet application, or any modern software, it is almost certainly UTF-8 and will convert correctly to Excel.
Yes. Our converter handles CSV files up to 100 MB, which can contain hundreds of thousands or even millions of rows depending on the number of columns and data density. The conversion runs on our servers, so it works regardless of your device's processing power. Note that Excel has a maximum of 1,048,576 rows per worksheet — if your CSV exceeds this limit, only the first million rows will appear in the spreadsheet.
The converter preserves your data as-is during the conversion. Once opened in Excel, you can format columns as dates, numbers, currency, percentages, or any other type using Excel's built-in formatting tools. This approach ensures no data is misinterpreted during conversion — for example, values like "01234" won't be silently stripped of leading zeros. You have full control over how each column is displayed and interpreted.
Use CSV when you need maximum compatibility for data exchange between different systems — database imports/exports, API data, automated pipelines, and programming. CSV is plain text and works everywhere. Use XLSX (Excel) when you need formatting, formulas, charts, multiple sheets, data validation, or when sharing data with people who need to work with it interactively. For reports, analysis, and presentations, Excel is the better choice.
The maximum file size is 100 MB. This is sufficient for most CSV files — a 100 MB CSV typically contains several million rows of data depending on the number of columns. If your file exceeds this limit, consider splitting it into smaller chunks before converting, or using a desktop application like LibreOffice Calc or Microsoft Excel which can handle larger files directly.
Yes. Convertio.com offers free CSV to Excel conversion with no watermarks, no registration, and no email required. Upload your file, convert, and download. Your files are encrypted during transfer and automatically deleted from our servers within 2 hours.

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