CSV列挿入
Insert new columns into CSV data at a specified position. Runs entirely in your browser.
よくある質問
How does column insertion work?
Enter new column data (one row per line), set the insert position, and columns are added to every row.
What is position 0?
Position 0 inserts at the very beginning. Position 1 inserts after the first column.
Is my data safe?
Yes. All processing happens locally in your browser.
