Convert Excel (.xlsx/.xls) files to CSV format online. All processing is done locally in your browser.
TL;DR: Free online Excel to CSV converter. Parse .xlsx/.xls files and export standard CSV with multi-sheet selection and separator options. Automatic quote escaping included. Files never leave your browser.
This tool runs entirely in your browser. Open DevTools → Network panel and search your input — it appears in no request.
Usage Guide
Convert an Excel (.xlsx/.xls) workbook to CSV: parse the spreadsheet, pick a worksheet and delimiter, handle quote escaping automatically — all locally, files never touch a server. Good for feeding programs, prepping database imports, or just keeping a plain-text copy.
1. Convert a workbook
- Drop an .xlsx or .xls file into the upload zone (or click to select).
- If the workbook has multiple sheets, pick one — CSV is flat, one sheet per file.
- Adjust the delimiter if needed (comma by default; semicolon is common in European locales), convert, then copy or download.
2. Format edges worth knowing first
- Commas, newlines and quotes inside cells are escaped per the CSV spec — downstream parsers must also be RFC 4180-compliant; Excel exports and most libraries are.
- Formulas convert as their computed values, not the formulas; dates convert as displayed — a cell showing 2024/1/15 comes out as that text.
- Merged cells keep only the top-left value, the rest come out empty — unmerge in Excel first if you need full data.
3. Pitfalls after the CSV exists
Reopening the CSV in Excel turns long numbers (ID cards, order numbers) into scientific notation and strips leading zeros — that is Excel display behavior, the file is intact; use Data Import with text columns to preserve them. Programs reading the file should confirm encoding: output is UTF-8 while some legacy systems expect GBK — check encoding first when Chinese text garbles.
FAQ
Completely free with no registration. Uploaded Excel files are parsed locally in your browser and never sent to any server.
Both .xlsx and .xls are supported. When a workbook contains multiple sheets, you can pick the one to export.
Cells containing commas, quotes, or newlines are automatically wrapped in double quotes and escaped, following the RFC 4180 standard.
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