TopTool
CSV→XLSX

CSV to XLSX

CSV to XLSX is a free online document converter for changing CSV files into XLSX files. CSV to XLSX accepts 4 MIME types, returns application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, includes 0 settings, and runs in your browser on the device.

Drop .csv file here

or click to choose

Key facts

Input
1 format: CSV (text/csv, application/csv, text/plain, )
Output
XLSX (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet)
Runtime
your browser on the device
Settings
0 controls; default conversion path
File mode
1 input file creates 1 output file
Cost
$0, no account required

How to use CSV to XLSX

  1. 1

    Open your CSV file

    Drop your CSV file onto the page, or click to browse and pick one from your device.

  2. 2

    Choose options

    No options to configure. CSV to XLSX uses sensible defaults.

  3. 3

    Convert and download

    Click Convert. Your XLSX file is ready to download in seconds.

CSV to XLSX details

First, CSV to XLSX reads CSV source files and prepares XLSX output for the document workflow. Next, CSV to XLSX keeps the conversion path simple with no extra controls. Additionally, Files and text stay in the browser session.

Drop in (or paste) a.csv file and download a real Excel.xlsx workbook with one worksheet named "Sheet1". Delimiters (comma, tab, semicolon, pipe) are auto-detected. Values are kept as strings unless they parse cleanly as numbers, so leading-zero codes like ZIP codes are preserved. Conversion runs entirely in your browser; your data never leaves your device.

Common searches

  • csv to xlsx
  • csv to xlsx converter
  • csv to excel
  • csv to excel converter
  • convert csv to xlsx
  • convert csv to excel

Related tools

Tools that work with the same formats — most users open one of these next.

DocumentOnline

XLSX to CSV

Convert an Excel spreadsheet (.xlsx / .xls) to a CSV file — free online, no upload.

XLSX→CSV
DocumentOnline

CSV to XML

Convert a CSV spreadsheet into a well-formed XML document — free online, no upload.

CSV→XML
DocumentOnline

JSON to XLSX

Convert a JSON file into an Excel .xlsx workbook — free online, no upload.

JSON→XLSX
DocumentOnline

CSV to HTML Table

Convert a CSV spreadsheet into a styled HTML table — free online, no upload.

CSV→HTML
DocumentOnline

CSV to Markdown Table

Convert a CSV spreadsheet into a GitHub-flavored Markdown table — free online, no upload.

CSV→MD
DocumentOnline

CSV to TSV

Convert a comma-separated file to tab-separated (TSV) — free online, no upload.

CSV→TSV

Frequently asked

What is CSV to XLSX?

CSV to XLSX is a free online document converter for changing CSV files into XLSX files. CSV to XLSX accepts 4 MIME types, returns application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, includes 0 settings, and runs in your browser on the device.

What files does CSV to XLSX accept and create?

CSV to XLSX accepts CSV files (text/csv, application/csv, text/plain, ) and creates XLSX files (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet). There are no required settings before conversion.

Do my files and data stay private?

Yes. CSV to XLSX runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.

How do I use CSV to XLSX?

Open CSV to XLSX, drop in your CSV file, choose any options, and click Convert. Your browser does the work locally and produces a XLSX file you can save right away.

What is the maximum file size for CSV to XLSX?

Because CSV to XLSX runs in your browser, the maximum size depends on your device's available memory. Most modern phones and laptops handle files up to a few hundred MB without issues.