CSV to Excel Converter
Convert CSV or TSV into a real .xlsx spreadsheet in your browser. Styled headers, auto column widths, number detection, drag-drop import. 100% client-side, no upload.
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What is CSV to Excel Converter?
The CSV to Excel Converter turns delimited text data (CSV, TSV, or any custom-separated values) into a genuine Excel .xlsx workbook directly in your browser. Unlike simply renaming a .csv file, it produces a standards-compliant Office Open XML spreadsheet in which numeric values become real number cells, the header row is visually styled, and columns are sized to fit their content.
Key Benefits
- No data leaves your device — ideal for confidential, financial, or customer data.
- Produces a true .xlsx file compatible with Excel, Google Sheets, LibreOffice Calc, and Numbers.
- Numeric cells are detected and stored as real numbers for formulas and charts.
- Supports comma, semicolon, tab, pipe, and custom delimiters with RFC-4180 quoting.
- One-click download with a styled, bold, highlighted header row and auto-sized columns.
Common Use Cases
- •Exporting a database query or log exported as CSV into a shareable Excel report.
- •Converting a TSV export from a terminal or data pipeline into a clean spreadsheet.
- •Turning a pipe- or semicolon-separated European CSV into an Excel file a colleague can open.
- •Preparing cleaned data for finance or accounting teams who expect a real .xlsx workbook.
- •Quickly inspecting and reformatting CSV samples without installing any software.
How to Use the CSV to Excel Converter
- Add your CSV data: Paste CSV text into the editor, drag-drop a file, or click Upload to load a .csv, .tsv, or .txt file. You can also click Sample to try example data.
- Pick the delimiter: Choose Comma, Semicolon, Tab, Pipe, or Custom to match how your data is separated. The preview updates instantly.
- Set options: Optionally change the Sheet name and File name. Tick "First row is a header" to style the first row bold and highlighted.
- Download the XLSX: Click Download XLSX. The file is generated locally and saved to your device with numeric cells converted to real numbers.
Key Features
- Generates a real .xlsx workbook (Office Open XML), not a renamed CSV.
- Works fully offline in the browser — no upload, no server, no sign-up.
- Supports comma, semicolon, tab, pipe, and custom single-character delimiters.
- RFC-4180 quoting handled: embedded commas, newlines, and doubled quotes.
- Styled header row, auto-sized columns, and automatic number detection.
- Drag-drop or upload a .csv / .tsv / .txt file, or paste data directly.