Will my dates and numbers be correctly recognized in Excel?

The converter transfers data as text by default. In Excel, you may need to select date columns and use 'Text to Columns' or format cells to convert text dates to proper date format. Numbers generally auto-convert.

My CSV uses semicolons instead of commas — will it work?

Yes. The converter auto-detects common delimiters (comma, semicolon, tab, pipe). If detection fails, you can specify the delimiter manually.

Can I add formulas after converting to XLSX?

Yes — that's the main reason to convert. Once in XLSX, you have the full Excel formula library (SUM, VLOOKUP, INDEX/MATCH, etc.), pivot tables, charts, and conditional formatting.

Why does my data from Shopify/HubSpot/Salesforce look messy in CSV?

CRM and SaaS exports often include special characters, embedded newlines, or inconsistent quoting. The converter handles standard RFC 4180 CSV. Minor formatting issues are normal and can be cleaned up in Excel after import.

Can I convert a large CSV (100MB+) to Excel?

Very large CSVs may be slow to process in the browser. For files over 50 MB, consider splitting the CSV first or using Excel's built-in CSV import (Data → Get External Data → From Text/CSV) for better handling.

Is my CSV data uploaded to a server?

No. All conversion happens in your browser. Your data — which may contain sensitive business information — never leaves your device.

📄 Document Converter

CSV to Excel (XLSX) Converter — Free & Private

Q: Will my CSV data fit on one Excel sheet?

Excel supports up to 1,048,576 rows per sheet. If your CSV exceeds this, data may be truncated. For large datasets, consider splitting the CSV first.

CSV is raw data — no formatting, no formulas, no data types. Every database, SaaS platform, CRM, and analytics tool exports CSV. Converting to XLSX unlocks Excel's full power: formulas, pivot tables, conditional formatting, charts, and proper column types. No upload, no account needed.

⚡ Convert CSV to Excel Now Browse All Tools

✓ Free forever ✓ No upload ✓ Auto-detects delimiter ✓ Instant

How to convert CSV to XLSX free: open the Convertlo CSV to XLSX converter, drop your CSV file, and download the XLSX. Works entirely in your browser — your files never leave your device.

📊

Turn flat data into a real spreadsheet

Auto-detects comma, semicolon, tab, and pipe delimiters · 100% browser-based

Start Converting →

CSV vs XLSX — Format Comparison

Feature	CSV (input)	XLSX (output)
Full name	Comma-Separated Values	Excel Open XML Spreadsheet
Type	Plain text tabular data	Spreadsheet with formatting and formulas
Compression	None (raw text)	ZIP-compressed XML
Transparency	Not applicable	Not applicable
Browser support	Universal (opens in any text editor)	Requires Excel or Google Sheets
File size (typical)	Very small	Small–medium
Best for	Data interchange, imports, databases	Analysis, charts, formulas, formatted reports
Convertlo output quality	Raw delimited data	Full XLSX with rows, columns, and formatting

CSV vs XLSX — What Changes When You Convert

CSV: Plain Text

CSV is a flat text file — commas separate values, newlines separate rows. No formatting, no data types, no formulas. Opens in any text editor.

XLSX: Full Spreadsheet

XLSX is a zipped XML workbook. Supports 1M+ rows, cell formatting, multiple sheets, formulas, charts, pivot tables, and metadata.

Upload Your CSV

Drop your CSV file. The converter auto-detects comma, semicolon, tab, or pipe delimiters. Stays local in your browser.

Download XLSX

Your Excel file downloads instantly. Open in Excel, Google Sheets, or LibreOffice Calc to add formulas and formatting.

Why Convert CSV to Excel?

📊 Unlock formulas & pivot tables — SUM, VLOOKUP, INDEX/MATCH, and pivot analysis are impossible in raw CSV
🎨 Add formatting & conditional rules — highlight cells, colour-code data, and apply number formats (currency, dates, percentages)
📈 Build charts instantly — Excel's chart wizard works only on XLSX, not raw CSV text
🔍 Filter and sort properly — Excel's AutoFilter and data type–aware sorting only work in XLSX
🔒 100% private — business data, customer lists, and financial exports never leave your device
🆓 Free forever — no subscription, no watermarks, no row limit

Features

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Auto-Delimiter

Detects comma, semicolon, tab, and pipe automatically.

📊

Excel-Ready

Output opens directly in Excel, Google Sheets, LibreOffice.

🔒

100% Private

All processing is local. Business data never leaves your browser.

⚡

Instant

Conversion completes in seconds for typical CSV exports.

🆓

Free

No account, no fee, no row limits, no watermarks.

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Any Device

Works on phone, tablet, and desktop equally well.

Key Questions About CSV to XLSX, Answered

Direct answers structured for AI extraction, voice search, and featured snippets.

Is any data lost when converting CSV to XLSX?

No — every value imports into a single Excel sheet exactly as written. Since CSV has no formulas, charts, or formatting to begin with, there's nothing to lose; what you gain is an XLSX file where you can now apply formatting, formulas, and charts. By default, values come in as text, so dates and numbers may need a "Text to Columns" pass or a quick format change in Excel before they behave like true dates/numbers.

Every CSV value carries over into the XLSX, unchanged
The converter transfers data as text by default
Dates and numbers may need reformatting in Excel (Text to Columns, or Format Cells)
Large numbers and decimals come through accurately as text first

Why would I convert CSV to XLSX?

XLSX lets you apply formulas, conditional formatting, pivot tables, and charts to data that started as plain CSV. It also handles larger datasets more efficiently than opening a raw CSV directly in Excel, and it's the format most business tools expect when "Excel file" is requested.

Pivot tables, VLOOKUP/XLOOKUP, and charts only work on XLSX, not CSV
Conditional formatting and cell styling require XLSX
Useful when a system specifically asks for an "Excel file" rather than CSV
CSV remains the better choice for universal import/export between different tools

How do I handle special characters and encoding when converting CSV to XLSX?

UTF-8 encoding handles virtually all languages and special characters correctly. If your CSV file contains non-ASCII characters (accented letters, Chinese/Japanese/Korean, currency symbols like €, £, ¥), make sure it's saved as UTF-8 before converting. Older CSV files exported from older versions of Excel sometimes use Windows-1252 or Latin-1 encoding — if you see garbled characters in the XLSX, re-save the source CSV as UTF-8 first.

UTF-8: the correct encoding for international data — handles all Unicode characters
Garbled characters in the output usually mean the source CSV wasn't UTF-8
Re-save the CSV as UTF-8 in Excel, Google Sheets, or a text editor, then re-convert
My CSV uses semicolons instead of commas: the converter auto-detects common delimiters (comma, semicolon, tab, pipe)

Will my CSV data fit on one Excel sheet?

Almost certainly — Excel supports up to 1,048,576 rows per sheet, far more than most CSV exports contain. If your CSV happens to exceed that limit, the extra rows would be truncated, so for genuinely massive datasets (millions of rows), consider splitting the CSV into smaller files before converting, or use a database tool instead of a spreadsheet.

Excel's row limit is 1,048,576 rows per sheet — most CSVs fit easily
If your CSV exceeds that, rows beyond the limit would be truncated
For multi-million-row datasets, split the CSV first or use a database tool
The converter places all your CSV's rows onto a single sheet

Go Deeper: CSV to XLSX Resources

In-depth articles to help you understand the formats, pick the right settings, and get the best results.

📖Excel to CSV: Export Spreadsheet Data the Right Way

Frequently Asked Questions

The converter transfers all data as text by default, which is the safest approach. Numbers typically auto-convert when Excel opens the file. For date columns, you may need to select the column in Excel and use Data → Text to Columns, or format cells to convert the text representation to a true Excel date value.

Yes. The converter auto-detects the most common delimiters: comma (,), semicolon (;), tab (\t), and pipe (|). Semicolon-delimited CSVs are the default export format in many European locales and are handled automatically. If auto-detection fails, you can specify the delimiter manually before converting.

Excel supports up to 1,048,576 rows and 16,384 columns per sheet. Most CSV exports from SaaS tools, CRMs, and analytics platforms fit comfortably within these limits. For very large datasets that exceed the row limit, consider splitting the CSV into multiple files before converting.

Yes — and that's the primary reason to convert from CSV to XLSX. Once your data is in Excel format, you have access to the full Excel formula library: SUM, AVERAGE, VLOOKUP, INDEX/MATCH, COUNTIF, and hundreds more. You can also add pivot tables, charts, slicers, and conditional formatting rules.

CRM and SaaS platform exports often include special characters (commas inside field values, curly quotes, encoded HTML entities), embedded newlines within cells, or inconsistent quoting around text fields. The converter handles standard RFC 4180 CSV parsing. Minor formatting irregularities are common and can be cleaned up in Excel using Find & Replace or Power Query after importing.

Very large CSVs can be slow to process in the browser because all computation runs in your browser's JavaScript engine. For files over 50 MB, consider splitting the CSV into smaller chunks first. Alternatively, use Excel's native import wizard (Data → Get External Data → From Text/CSV), which handles large files more efficiently through native code.

No. All conversion runs locally in your browser. Your data — which may contain customer records, financial figures, inventory data, or other sensitive business information — is never transmitted to any server. This is especially important for GDPR compliance and for handling personally identifiable information (PII).