CSV to XLSX
Drop in (or paste) a .csv file and download a real Excel .xlsx workbook with one worksheet named "Sheet1". Delimiters (comma, tab, semicolon, pipe) are auto-detected. Values are kept as strings unless they parse cleanly as numbers, so leading-zero codes like ZIP codes are preserved. Conversion runs entirely in your browser — your data never leaves your device.
Drop .csv file here
or click to choose
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Supports
.csv → .xlsx
Related tools
Tools that work with the same formats — most users open one of these next.
XLSX to CSV
Convert an Excel spreadsheet (.xlsx / .xls) to a CSV file — free online, no upload.
CSV to JSON
Convert CSV files to pretty-printed JSON — free online, no upload.
CSV to YAML
Convert CSV files to YAML — free online, no upload.
CSV to HTML Table
Convert a CSV spreadsheet into a styled HTML table — free online, no upload.
CSV to Markdown Table
Convert a CSV spreadsheet into a GitHub-flavored Markdown table — free online, no upload.
CSV to TSV
Convert a comma-separated file to tab-separated (TSV) — free online, no upload.
Frequently asked
Is CSV to XLSX free to use?
Yes. CSV to XLSX is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — CSV to XLSX runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does CSV to XLSX work?
Open CSV to XLSX, drop in your CSV file, choose any options, and click Convert. Your browser does the work locally and produces a XLSX file you can save right away.
What's the maximum file size for CSV to XLSX?
Because CSV to XLSX runs in your browser, the maximum size depends on your device's available memory. Most modern phones and laptops handle files up to a few hundred MB without issues.