Convert CSV to Excel (XLSX) Online - Free File Converter

Open CSV files directly in Excel by converting to XLSX format. No software needed.

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.csv → .xlsxDataLosslessInstantRuns 100% in your browser

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Your .csv file never leaves your device or touches a server.
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About CSV to XLSX conversion

CSV is a plain-text format with no styling, formulas, or multiple sheets - just raw values separated by commas. XLSX is Excel's native binary-adjacent format, which supports cell formatting, multiple sheets, and richer data types.

Converting CSV to XLSX is usually about handoff: a script or database export produces CSV, but the person who needs to review it expects to open it directly in Excel with proper column formatting rather than a plain-text file.

Common use cases

  • Delivering a CSV export as a polished Excel file
  • Preparing raw data for stakeholders who work exclusively in Excel
  • Opening database query results without a plain-text intermediate step
  • Converting scraped or generated CSV data into a shareable spreadsheet

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FAQ: CSV to XLSX conversion

Why choose our file content conversion tool

Browser-based file content conversion beats upload-based tools on privacy, speed, and cost.

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Trusted by developers, analysts, and content teams

4.9/5
from 2,200+ users

I use the CSV to JSON converter daily for backend testing. It's instant, no login, and the output is clean. Exactly what I needed.

AK
Ali K.
Full-stack developer

Finally a DOCX to HTML tool that doesn't mangle the formatting. Converted 40 articles in 20 minutes.

SR
Sarah R.
Content manager

XLSX to CSV in one click with zero setup. I've tried five other tools - this is the only one that runs entirely in the browser.

MP
Marco P.
Data analyst
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