10 MB per file · 20 MB combined · up to 20 files. Desktop browser recommended.
Choose a file or use the sample. No uploads, no external scripts.
Free: up to 20 files, 50,000 rows per source and 500,000 cells per workbook. All values remain text.
Convert CSV files into a real .xlsx workbook. Every cell is stored as text, preserving leading zeros, long IDs, date strings and formula-like values. Your source files stay on this device.
10 MB per file · 20 MB combined · up to 20 files. Desktop browser recommended.
Free: up to 20 files, 50,000 rows per source and 500,000 cells per workbook. All values remain text.