File converter / Documents / Convert to CSV / XLSX converter / CSV to XLSX

Convert CSV to XLSX

Choose file to convert to .xlsx
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You can convert CSV file to XLSX as well as to variety of other formats with free online converter.

csv to xlsx

How to convert csv to xlsx?

How to convert xlsx to csv?
Step 1

Upload csv-file

Select csv file, which you want to convert, from your computer, Google Drive, Dropbox or drag and drop it on the page.
Step 2

Convert csv to xlsx

Select xlsx or any other format, which you want to convert.
Step 3

Download your xlsx-file

Wait till your conversion process will be completed and click download converted xlsx file.

Online and free csv to xlsx converter

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Just drop your csv files on the page to convert xlsx or you can convert it to more than 250 different file formats without registration, giving an email or watermark.
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Comma Separated Values File

File extension .csv
File category documents
Description CSV – is a unique text format. The data inside of which are separated by commas—developed in the early 70-ies of the XX century to import various table information and transfer bulk information between databases in text format. Each line of the file acts as one row of the database. Using the spreadsheet application, CSV files can be organized into cells and added to the appropriate database. Commas separate the parameters of each column. If there are reserved symbols (for example, a semicolon or a new line), double quotes play the separator role. This allows you to transfer information between different programs freely. CSV, in some cases, are сalled flat files. They can be opened by most editors able to work with tables and texts, including both authentic Excel and open source utilities like Apache Open Office and Libre Office.
Technical details On personal computers, the CSV extension includes many values represented as ASCII tables. In this case, the text strings are clearly organized, so all values are separated by commas or double quotes (if there are reserved symbols). The use of different delimiters allows the availability of unequal encoding.
Microsoft Excel
Microsoft Works
Corel Quattro Pro
Apache OpenOffice
Microsoft Notepad
Libre Office
MobiSystems OfficeSuite Pro 7
Developer Microsoft
MIME type

Office Open XML Document

File extension .xlsx
File category documents
Description XLSX – is an e-book created with one of the versions of the Excel program older than 2007. Thus the data have the form of tables consisting of columns and lines. Each table is divided into cells with a unique address, consisting of numeric and alphabetic characters. Cells contain data, both manually entered, and information that was obtained as a result of calculations. The extension allows the use of images, diagrams, and graphic information. XLSX files are formatted based on the Open XML standard, which will enable you to compress data by the type of ZIP. The archive contains a file for describing the table and individual files for each of its worksheets. The format makes it possible to develop and edit complex multi-sheet spreadsheets with various formulas and data sources.
Technical details Using the XLSX extension helps to optimize the file's content, the technology of managing, and restoring information. The format significantly increases the capabilities of binary files of obsolete Excel program variants. All applications that display XML can work correctly with the XLSX extension. Due to the preservation of data in XML format, reliable data storage is provided. This allows you to transfer files over local networks seamlessly.
Microsoft Office
Kingsoft Office
Google Docs
Main program Microsoft Office
Developer Microsoft
MIME type


❓ How can I convert csv to xlsx?
Firstly, select a csv file you want to convert or drag and drop it. Secondly, select xlsx or any other format you want to convert your file to. Then click convert and wait until your file is converted
⏳ How long should I wait to convert csv to xlsx?
Documents conversion usually takes a few seconds. You will convert csv to xlsx very quickly.
🛡️ Is it secure to convert csv to xlsx on OnlineConvertFree?
Sure! We delete your uploaded and converted files, so nobody has access to your information. All types of conversion on OnlineConvertFree (including csv to xlsx) is 100% safe.
📱 Can I convert csv to xlsx without software installation?
Absolutely! OnlineConvertFree doesn’t require installation. You can convert any files (including csv to xlsx) online on your computer or mobile.