Document tool · Free
CSV to XLSX
Convert CSV data into an Excel .xlsx workbook with a bold, frozen header row and real number cells.
- Runs in your browser — files are not uploaded
- Input: csv → xlsx
- Up to 25 MB per file
How to use CSV to XLSX
- 1
Add a .csv file.
- 2
Check the delimiter and header options.
- 3
Click Convert to XLSX and download the workbook.
About this tool
Opening a CSV directly in Excel can mangle codes, phone numbers and non-English text. This converter parses the CSV in your browser (comma, semicolon or tab, detected automatically), stores plain numbers as numbers while keeping values such as 007 or long IDs as text, and creates a proper .xlsx workbook with an optional bold, frozen header row.
Frequently asked questions
Will leading zeros be kept?
Yes. Values with leading zeros, such as 007 or PIN codes starting with 0, and numbers longer than 15 digits are kept as text.
Does it handle quotes and line breaks inside fields?
Yes. Standard CSV quoting, including escaped quotes and line breaks inside quoted fields, is supported.
Is CSV to XLSX private?
Yes. This tool processes files entirely in your browser, so your files are not uploaded to our servers.
Cloud-Based Custom Software
Need A Custom Tool For Your Business?
PKD Ventures builds cloud-based custom software and business applications around your workflow.