Free & 100% Private

Convert CSV to Excel Online Free

Instantly convert CSV files to Excel spreadsheets right in your browser. Smart delimiter detection, live data preview, and zero uploads — your data never leaves your device.

Upload Your CSV File
Drag & drop your .csv, .tsv, or .txt file to convert to Excel

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Why Convert CSV to Excel With Us?
The fastest, safest way to convert CSV to Excel online

Smart Delimiter Detection

Automatically detects commas, semicolons, tabs, and pipes. No manual setup needed — our tool figures out your file format instantly.

Live Data Preview

See your data in a formatted table before downloading. Verify columns, check data types, and catch issues early.

Column Type Detection

Numbers, dates, and text are detected automatically. Leading zeros in codes and IDs are preserved — a common problem with Excel imports.

Complete Privacy

Your CSV files never leave your device. No uploads, no tracking, no data collection whatsoever. 100% local browser processing.

Multi-File Support

Upload multiple CSV files and convert them all at once. Each file becomes a separate sheet in one Excel workbook.

No Installation Required

Works in any modern browser on any device — Windows, Mac, Linux, or Chromebook. No plugins, no downloads.

CSV to Excel — The Easiest Way to Convert Delimited Files

Whether you're importing data from a database, cleaning up API exports, or converting reports for your team, transforming CSV to Excel is one of the most common data tasks. Our free tool handles the conversion entirely in your web browser, so your data remains completely private on your device at all times.

Why Convert CSV to Excel?

CSV (Comma Separated Values) files are universal but limited — they lack formatting, multiple sheets, and data types. By converting CSV to Excel (XLSX), you gain rich formatting capabilities, the ability to organize data across multiple sheets, proper number and date handling, formulas, charts, and much more. Excel files are the standard for sharing structured data in business, finance, and research.

How to Convert CSV to Excel Online?

  1. Upload Your CSV File: Drag and drop your CSV, TSV, or delimited text file into the upload zone. Your file stays on your device — nothing is uploaded to any server.
  2. Verify the Preview: Our tool automatically detects the delimiter and shows a live preview of your data. You can manually override the delimiter if needed.
  3. Download Your Excel File: Click the 'Download Excel' button. The conversion from CSV to XLSX happens instantly in your browser, and the formatted Excel file downloads automatically.

Technical Specifications & Privacy Guarantee

100% client-side security standards and browser-native processing

Input Formats

.csv, .tsv, .txt

Comma, semicolon, tab, pipe delimiters

Output Format

.xlsx (Excel 2007–2024)

Office Open XML Spreadsheet format

Architecture

100% Client-Side

Zero bytes sent to external servers

Data Privacy

Zero Data Retention

GDPR & HIPAA compliant by design

Character Encoding

UTF-8, Latin-1, Windows-1252

Preserves accents, non-Latin scripts, emoji

Usage & Limits

100% Free Forever

No login, no daily conversion caps

FAQ

Is it safe to convert sensitive CSV data here?+
Absolutely. The entire conversion happens inside your browser using JavaScript. Your files are never uploaded to any server, making this one of the safest converters available online.
How does delimiter auto-detection work?+
Our tool analyzes the first several lines of your file and counts occurrences of common delimiters (comma, semicolon, tab, pipe). It picks the one that creates the most consistent number of columns across rows. You can always override the detection manually.
Will my leading zeros be preserved?+
Yes! Unlike many tools that convert everything to numbers (causing codes like '007' to become '7'), our converter detects columns that should remain as text and preserves leading zeros automatically.
Can I convert a tab-separated file (TSV)?+
Yes. Our tool supports comma-separated (.csv), tab-separated (.tsv), and other delimited text files. The delimiter is auto-detected, or you can select it manually.
Is there a file size limit?+
Since the processing runs locally on your device, there is no server-imposed file size limit. The only constraint is your device's available memory. Most files up to 50MB convert without any issues.
Can I convert multiple CSV files at once?+
Yes! You can upload multiple CSV files, and each file will be placed on a separate sheet in the resulting Excel workbook. This is perfect for consolidating related datasets.