Turn CSV into a real .xlsx workbook in your browser: parsed values preserved, column widths set from content. Nothing is uploaded.
Paste CSV, name the sheet, then convert.
Convert first — the workbook downloads immediately.
Limit for uploaded files: 25 MB. Pasted text is not truncated by the tool — your browser’s memory is the ceiling.
Your file is never sent to a server. It is read and processed by your own browser, and the results are not stored.
Excel opening a CSV is guessing: encoding, delimiter, whether “01” is a number or a product code. This tool makes the same guesses — and shows you, because the .xlsx keeps what CSV had. If you need types controlled exactly, the CSV to JSON tool gives you that view instead.
Sheet names follow the file name by default; SheetJS prunes characters and caps at 31. Override it with the name field for multi-step pipelines.
No. CSV to Excel Converter runs in your browser, and the file is read there rather than sent to a server for processing. Our host still sees ordinary page-request metadata, which is described on the privacy page.
Yes, CSV to Excel Converter is free, with no paid tier, no account, and no watermark added to your output. The limits are technical rather than commercial: file size, page count and supported formats are listed on this page.
CSV to Excel Converter supports .csv, .tsv, .txt files up to 25MB directly in your browser.
Cells that look like numbers are written as numbers, and everything else is written as text — exactly what openpyxl/SheetJS would produce.
CSV with quoted fields, doubled quotes and embedded newlines is parsed per RFC 4180; the .xlsx contains one cell per parsed value.
Column widths are sized to the longest content, the first row is bolded as a header where present. No formulas, colors or conditional formatting — CSV has no such notion.
No. Parsing and workbook assembly happen in this tab; nothing leaves your device.