CSV to XLSX Converter

Select files for conversion or just drag and drop them to the upload area

How to convert CSV files to XLSX online?

Step 1.

Upload CSV-file

Click "Choose File" button to select a csv file on your computer. CSV file size can be up to 50 Mb.
Step 2.

Convert CSV to XLSX

Click "Convert" button to start conversion.
Step 3.

Download your XLSX

Let the file convert and you can download your XLSX file right afterwards.

Information about CSV and XLSX file formats

Name CSV XLSX
Full name CSV - Comma-Separated Values XLSX - Office Open XML Document
File extension .csv .xlsx, .xlsm
MIME type text/csv application/vnd.-openxmlformats-officedocument.-spreadsheetml.-sheet
Developed by Informational RFC Microsoft
Type of format multi-platform, serial data streams Spreadsheet
Description In computing, a comma-separated values (CSV) file stores tabular data (numbers and text) in plain text. Each line of the file is a data record. Each record consists of one or more fields, separated by commas. The use of the comma as a field separator is the source of the name for this file format. The Office Open XML file formats are a set of file formats that can be used to represent electronic office documents. There are formats for word processing documents, spreadsheets and presentations as well as specific formats for material such as mathematical formulae, graphics, bibliographies etc.
Technical details The CSV file format is not standardized. The basic idea of separating fields with a comma is clear, but that idea gets complicated when the field data may also contain commas or even embedded line-breaks. CSV implementations may not handle such field data, or they may use quotation marks to surround the field. Office Open XML documents are stored in Open Packaging Convention (OPC) packages, which are ZIP files containing XML and other data files, along with a specification of the relationships between them. Depending on the type of the document, the packages have different internal directory structures and names.
Associated programs Microsoft Excel, LibreOffice Calc Microsoft Office, LibreOffice, Kingsoft Office, Google Docs.
Wiki https://en.wikipedia.org/wiki/Comma-separated_values https://en.wikipedia.org/wiki/Office_Open_XML_file_formats