To convert CSV to XLS, choose your CSV data files above, adjust the options if needed and press "Convert to XLS". The XLS downloads instantly: free, with no sign-up, and the file never leaves your device.
About the CSV to XLS Converter
Need to turn a CSV file into XLS? This free converter changes CSV data files into XLS in a few seconds, right in your browser. People usually convert because CSV has no formatting, no sheets and no data types, while XLS gives you an Excel 97–2003 workbook. XLS files open in every version of Excel, LibreOffice Calc, Google Sheets and WPS Office.
Spreadsheets are read and written with SheetJS, the open-source spreadsheet engine used by thousands of data apps, so every sheet, row and value is handled accurately. Because everything happens on your own device, your data files are never uploaded, stored or seen by anyone else, which makes it safe for customer lists, salary sheets, GST data and API exports.
What to expect: the delimiter and text encoding are detected automatically; formulas are exported as their calculated values, while text such as PIN codes and phone numbers with leading zeros stays intact.
How to use the CSV to XLS Converter
- Click "Choose files" or drag your CSV data files onto the box. You can add several at once.
- Choose whether to convert all sheets or only the first one.
- Press "Convert to XLS". The conversion runs on your device and shows its progress.
- Download each XLS file, or use "Download all (ZIP)" when you converted several.
- Open the result in every version of Excel or LibreOffice Calc to check it; your original CSV is never changed.
Tips & benchmarks
- XLS holds at most 65,536 rows and 256 columns per sheet; larger data is cut at that limit.
- Merged cells are unmerged and their value is kept in the first cell, which keeps the data easy to filter and import.
- Keep the file name simple (letters, numbers and hyphens) if you plan to upload the XLS to a website or government portal.
Frequently asked questions
How do I convert CSV to XLS?
Click "Choose files", select your CSV data files, adjust the options if you want, and press "Convert to XLS". The XLS downloads immediately; with several files you can download everything as one ZIP.
Is this CSV to XLS converter free and safe?
Yes. It is completely free, with no sign-up, no daily limit and no watermark. The conversion runs inside your browser, so your data files never leave your phone or computer and nothing is stored on News Appite's servers.
Are formulas, formatting and all sheets kept?
Every sheet is converted (or only the first, if you choose). Formulas are exported as their current values, and cell colours and fonts are not carried over because formats such as CSV, JSON and SQL cannot store them.
Can I convert several CSV files at once?
Yes. Add as many CSV files as you like; they are converted one after another and you can download them individually or together as a ZIP.
Does it work on iPhone, Android and Mac?
Yes. The converter works in any modern browser, including Chrome, Safari, Edge and Firefox, on Android, iPhone, iPad, Windows, macOS and Linux. No app is needed.
What is the difference between CSV and XLS?
CSV (Comma-Separated Values) is a plain-text table best suited to importing data into databases, CRMs, Tally, mailing tools and Python or R. XLS (Microsoft Excel 97–2003 Workbook) is a legacy binary spreadsheet best suited to older Excel versions, legacy ERP and bank systems and portals that only accept .xls.
Is there a file size limit?
There is no upload limit, because nothing is uploaded. The practical limit is your device's memory: files of a few hundred megabytes work on most computers, and phones handle smaller files comfortably.
How do I convert CSV to XLS in Excel?
Open the file in Excel via Data → From Text/CSV (choose UTF-8 for Hindi or ₹), then use File → Save As. This converter does it instantly and keeps leading zeros such as PIN codes.
How do I convert CSV to XLS in Python?
With pandas: df = pd.read_csv('input.csv'), then save it as .xlsx with df.to_excel('output.xlsx'); current pandas versions can no longer write the old .xls format. If you just need the file, this converter does it in the browser without writing any code.
CSV ko XLS kaise kare?
Is page par "Choose files" dabaiye, apni CSV file chuniye aur "Convert to XLS" par click kijiye. XLS file turant download ho jaati hai. Ye bilkul free hai, sign-up nahi chahiye, aur aapki file kisi server par upload nahi hoti.
CSV vs XLS: format comparison
| CSV | XLS | |
|---|---|---|
| Full name | Comma-Separated Values | Microsoft Excel 97–2003 Workbook |
| Type | Plain-text table | Legacy binary spreadsheet |
| Created by | Described in RFC 4180 (2005) | Microsoft, Excel 97 (BIFF8) |
| Compression | None (text) | Binary |
| File extension | .csv | .xls |
| MIME type | text/csv | application/vnd.ms-excel |
| Best for | Importing data into databases, CRMs, Tally, mailing tools and Python or R | Older Excel versions, legacy ERP and bank systems and portals that only accept .xls |
| Opens in | Excel, Google Sheets, Notepad, MySQL, pandas and every CRM | every version of Excel, LibreOffice Calc, Google Sheets and WPS Office |
What is a CSV file?
CSV stores a single table as plain text, one row per line with values separated by commas. Every spreadsheet, database, CRM and programming language can import it, which makes it the universal format for moving data.
What is a XLS file?
XLS is the binary format Excel used from 1997 to 2003. It is limited to 65,536 rows and 256 columns per sheet, but many banks, ERPs and government portals still export or demand XLS files.
Need it the other way round? Use the XLS to CSV Converter.
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