How to use this office tool
Select two or more CSV or TSV files. Each file is parsed separately, then added to a new Excel workbook as its own worksheet.
#172 · Spreadsheet Conversion Tool
Multiple CSV Files to Excel Workbook
Combine multiple CSV or TSV files into one Excel workbook, with one sanitized worksheet per source file, entirely in your browser.
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What this tool does
Each source filename becomes a sanitized, unique sheet name. Delimiters are detected by file extension and parsed quoted fields remain intact.
Each source filename becomes a sanitized, unique sheet name. Delimiters are detected by file extension and parsed quoted fields remain intact.
Excel worksheet limits still apply. Very large source files may exceed browser memory.
Supported formats
XLSX, XLS, CSV, and TSV are accepted where the operation supports them. Browser memory, parser support, and Excel worksheet limits apply.
| Format | Support |
|---|---|
| XLSX / XLS | Parsed locally; advanced workbook objects may not be preserved |
| CSV / TSV | Quoted fields supported; encoding is read by the browser |
Tips for better results
- Use short, distinct filenames for useful sheet names.
- Keep a consistent delimiter within each source file.
- Spot-check leading-zero identifiers after import.
FAQ
Can each CSV file become a separate Excel worksheet?
Yes. Each selected CSV or TSV file is parsed into its own worksheet.
How are duplicate worksheet names handled?
The tool sanitizes names and adds a numeric suffix when two source filenames resolve to the same sheet name.
Will quoted commas stay in one CSV field?
Yes. Papa Parse handles quoted fields and embedded delimiters during parsing.
Can I mix CSV and TSV files?
Yes. TSV files use tabs, while CSV delimiters are detected from their content.
Why might a very large conversion fail?
Browser memory and Excel worksheet limits can be exceeded by very large or unusually wide data sets.
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Processing summary
| Stage | Action |
|---|---|
| Input | Validated and parsed locally |
| Output | A newly generated file is downloaded |
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