Temporary storage
Originals are removed after processing.
Convert CSV to XLSX online
Upload a supported file up to 1 GB, choose a compatible output, and download the result. Files are removed automatically after processing.
File converter
Upload a CSV file
3–10 minute downloads
The exact time is based on storage use when each result is ready, then remains fixed.
Compatible outputs
Only valid targets are offered for each input.
Format guide
About CSV to XLSX conversion
FileFy reads the CSV content with its matching parser and writes a compatible XLSX result. Complex layout may be simplified.
How CSV rows become an XLSX workbook
FileFy reads the UTF-8 comma-separated rows and places them in a worksheet named Sheet1. Quoted fields and embedded delimiters are handled by the CSV parser.
Every output cell is written as text. The converter does not infer dates or numbers, create formulas, or add spreadsheet styling.
How it works
- Select a CSV file.
- FileFy uploads and converts the file.
- Download the XLSX result.
File handling
The original upload is removed after processing. Each result receives a storage-based expiry period of 3 to 10 minutes when processing completes. Once assigned, that period is not shortened afterward.