CSV to XLSX
Create a single-sheet Excel workbook from delimited text.
Drop your files here
Make something new. Keep everything private.
Multiple files welcome · processed one at a time
Select a tool to see its supported formats and conversion limits. Large files may exceed your browser’s memory.
Before processing large files
On phones and tablets, start with files under 20 MiB and keep this tab in the foreground. Video, OCR and 3D operations can use several times the input size in memory. Desktop browsers generally have more room, but the 128 MiB job limit is not a guarantee that every file will fit. Smaller batches reduce memory pressure.
Supported input formats
- Comma-separated values (.csv)
Output format
Microsoft Excel Open XML workbook (.xlsx)
Support applies to this conversion direction. Check the limits below for features that may change or be discarded.
Compare all supported formats and conversion limits →How to use CSV to XLSX
- Add your supported file using the chooser or drop zone.
- Review the settings and conversion limits before processing.
- Select Convert files, then download the result.
What to expect
- All cells are written as text, preserving leading zeros and preventing formula injection. No formatting or formula calculation. 100,000 rows / 2 million cells maximum.
Engine: OOXML / fflate. The engine may need a first-use download. Your file stays in this browser session.Check conversion engines and offline requirements.
Conversion settings
These settings are available in the converter above.
- Worksheet name
- Default: Sheet1.
About this conversion
Is csv to xlsx free?
Yes. This tool runs on your device without an account or a conversion fee.
Are files uploaded during conversion?
File processing happens locally in your browser. Engines may download their code on first use; your input files are not sent to a conversion server. Read how file privacy works.
What if conversion fails?
Check that the file matches a supported input, review the engine’s limitations and try a smaller representative file. If the engine cannot load, check its engine assets and browser requirements. The app reports failures without switching to a remote converter.
Continue with your output
These tools accept this tool’s output format. Each step has its own settings and fidelity limits.
- XLSX to CSV
Export an explicitly selected worksheet from an Excel workbook.
- XLSX to TSV
Export an explicitly selected worksheet from an Excel workbook.
- XLSX to JSON
Export an explicitly selected worksheet from an Excel workbook.
- Spreadsheet to PDF
Render and export locally with LibreOffice's ZetaOffice browser build.
- Spreadsheet to XLSX
Render and export locally with LibreOffice's ZetaOffice browser build.
- Spreadsheet to ODS
Render and export locally with LibreOffice's ZetaOffice browser build.
More spreadsheets tools
- TSV to XLSX
Create a single-sheet Excel workbook from delimited text.
- OCR to XLSX (best effort)
Recognize English text and infer rows and columns from explicit separators.