How to Convert CSV to Excel XLSX Online
Comma-Separated Values (CSV) is the most portable tabular data format โ virtually every application from databases to CRMs can export it. But for day-to-day work, Excel's XLSX format offers far more: multiple sheets, cell formatting, formulas, filters, and frozen headers. This tool bridges the gap instantly.
Unlike server-based converters, everything here runs in your browser using the SheetJS (xlsx) library. Your file is never uploaded anywhere. You can convert sensitive payroll data, customer lists, or financial records without any privacy risk.
Supported Options
- Delimiter auto-detection โ The tool sniffs the first line to identify comma, tab, semicolon, or pipe delimiters automatically.
- Custom sheet name โ Name your worksheet before exporting so the file is ready to share without manual renaming.
- Header row control โ Mark the first row as a header so it stays frozen and bold when opened in Excel or Google Sheets.
- Paste or upload โ Either drop a .csv file or paste raw text directly into the input area.
When Would You Need This?
Database exports (MySQL, PostgreSQL, SQLite) and SaaS exports (Stripe, HubSpot, Shopify, Airtable) typically provide CSV. Excel is preferred for sharing with non-technical stakeholders, building pivot tables, applying conditional formatting, or using VLOOKUP and other formulas. This tool is the fastest path from a CSV export to a shareable XLSX file.