File Conversion
CSV to XLSX Converter
Convert CSV files to Excel spreadsheets (XLSX). Import data with proper column formatting and structure.
Drop a file to begin
Drag files here, paste, or click to browse
How to convert CSV to XLSX
- 1
Upload the .csv file.
- 2
LibreOffice Calc reads it and writes one sheet, typing each column as it goes.
- 3
Download the .xlsx workbook.
Notes on this conversion
One CSV becomes one workbook with one sheet, and the conversion-loss table records no entry for this route. LibreOffice Calc types each column as it reads it, so numbers arrive as numbers and dates as dates instead of as strings that merely look like them — that typing is the whole difference between this and renaming the file. Nothing arrives as a formula, because a CSV has nowhere to store one: a calculated column comes through as the value it held when the file was written.
Specifications
- Max file size
- Up to 100 MB per file
- Processing speed
- Typically under 10 seconds
- Quality
- Optimized for best output quality
- Batch support
- Multiple files supported
Your Files Are Safe
All files are encrypted with 256-bit TLS during transfer. Uploaded files are stored temporarily and automatically deleted about an hour after upload. We never access, read, or share your files.
Frequently Asked Questions
Do I get a real spreadsheet, or text sitting in a grid?
A real one. Calc detects each column as it reads, so numbers arrive as numbers and dates as dates rather than as strings that happen to look like them — which is the difference between this and renaming the file.
Do formulas come across?
There are none to bring. A CSV stores the text of each cell and nothing else, so a column that was calculated in the original spreadsheet arrives as the value it held when the CSV was written.
Can several CSV files become several sheets in one workbook?
No. One file makes one workbook with one sheet. Converting each file separately and combining them is the way to a multi-sheet book.
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