Secure server processing

Convert CSV to Excel XLSX

Transform tabular CSV data into a Microsoft Excel XLSX workbook with temporary server processing.

Selecting a file does not upload it. Upload and convert sends it to temporary server storage. One file at a time; 25 MiB maximum.

Drop files here or click to upload

Supported formats: .csv

Choose Files

Max 25 MB per file•Up to 1 files

Uploaded only after you choose Upload and convert; temporary server processing

How it works

Select a CSV file with comma, semicolon, tab or pipe delimiters.
Choose Upload and convert.
Download the generated XLSX workbook.

The worker parses CSV rows, auto-detects column structures, and creates a formatted XLSX spreadsheet with formula injection neutralization.

Supported documents and limitations

Maximum file size: 25 MiB, up to 50,000 rows and 1,000 columns. Formula prefixes (=, +, -, @) are escaped to prevent formula execution in spreadsheet software.

Temporary server processing

Your file is uploaded only when you choose to convert. An isolated worker processes it without network access. Uploaded files expire after one hour; completed outputs expire one hour after completion. Failed, cancelled or deleted jobs become eligible for immediate cleanup. Service outages can delay physical deletion; a previously issued download link can remain valid briefly. Clear files to request early deletion. Downloads saved on your device remain there.

PDF processing is limited to 200 pages; HTML and reverse conversions have the stricter limits listed above. Complex files may reach time, memory or scratch limits sooner. No malware-free, perfect-fidelity or certified-accessibility claim is made.