Select files for conversion or just drag and drop them to the upload area
| Name | XLSX | CSV |
| Full name | XLSX - Office Open XML Document | CSV - Comma-Separated Values |
| File extension | .xlsx, .xlsm | .csv |
| MIME type | application/vnd.-openxmlformats-officedocument.-spreadsheetml.-sheet | text/csv |
| Developed by | Microsoft | Informational RFC |
| Type of format | Spreadsheet | multi-platform, serial data streams |
| Description | 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. | 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. |
| Technical details | 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. | 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. |
| Associated programs | Microsoft Office, LibreOffice, Kingsoft Office, Google Docs. | Microsoft Excel, LibreOffice Calc |
| Wiki | https://en.wikipedia.org/wiki/Office_Open_XML_file_formats | https://en.wikipedia.org/wiki/Comma-separated_values |