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CSV to Excel
Make a proper XLSX or ODS from CSV files with numbers as numbers, a frozen bold header, filters and fitted columns.
Free, no uploads, no sign-up. Runs 100% in your browser.
How CSV to Excel works
Files are opened in your browser with SheetJS and JSZip. Nothing is uploaded, and your original file is never changed. The separator and text encoding are detected. Codes with leading zeros, like 007, stay as text.
Input: CSV, TSV, TXT. Output: XLSX, ODS.
How to use CSV to Excel
- Drop CSV files.
- Check the separator and encoding.
- Choose header and filter options.
- Press Make workbook.
Tips
- Excel, ODS and CSV all work. Formulas are read as their last saved values.
- For CSV files with odd characters, save them as UTF-8 first.
CSV to Excel FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
Related tools
- Excel to CSV & JSON: Convert every sheet of many Excel or ODS workbooks to CSV, TSV, JSON or NDJSON in one go.
- Merge Excel Files: Combine sheets from many Excel, ODS or CSV files into one workbook, or stack their rows into one table.
- Remove Duplicate Rows: Delete repeated rows from Excel or CSV, matching on all columns or the ones you pick, ignoring case and spaces.
- Merge Word Documents: Combine DOCX files into one, keeping text, tables, images and links, with page breaks between them.