CSV to XLSX
Create an Excel-compatible file for Microsoft Excel or Google Sheets.
Private spreadsheet conversion
Convert CSV to XLSX without an upload
Create a modern XLSX workbook from CSV while keeping control of headers, column types, cleanup, and worksheet naming.
Upload a spreadsheet
Drag and drop a CSV, XLSX, or XLS file. All processing happens locally in your browser with SheetJS.
No upload. No account. Your file stays on this device.
XLSX to CSV
Export spreadsheet data as CSV for use in other systems.
Clean and rename
Remove empty rows and rename columns before export.
Batch conversionConvert several CSV or spreadsheet files locally. A failed file does not stop the rest of the queue.
Batch conversion
Convert several CSV or spreadsheet files locally. A failed file does not stop the rest of the queue.
Up to 20 files and 250 MB total per queue. Two files are processed at a time to limit memory use.
Drop CSV, XLSX, or XLS files here
No files are queued. Source files are never included in ZIP downloads.
Create a structured XLSX workbook
Use type inference and a full preview to catch malformed headers, dates, numbers, empty rows, or duplicates before creating your workbook.
How to use this tool
- 1Open a CSV file from your device.
- 2Confirm parsing and clean or validate the rows.
- 3Choose an XLSX filename and worksheet name, then export.
Frequently asked questions
What is the difference between XLSX and CSV?
XLSX can retain typed cells, worksheet names, and formatting, while CSV is plain delimited text.
Can Delimora handle semicolon CSV?
Yes. It detects semicolon CSV and lets you override the detected delimiter.
Will dates keep their timezone?
Values without an explicit timezone are handled without applying an unintended timezone shift.