Transpose CSV Files Online
To transpose a CSV file online, upload it to Large CSV Viewer and choose Transpose from the File menu. Rows and columns are flipped — what were column headers become the first column, and each row becomes a new column. The transposed file downloads as a CSV. Free, no account, works on any file size.
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Need to rotate your data so rows become columns and columns become rows? Large CSV Viewer transposes any CSV in one click — a common operation when restructuring data for a different tool, chart, or import format.
Key features
- One-click CSV transpose — rows become columns and vice versa
- Original column headers become the first column of the output
- Works on files of any size — runs server-side
- Download the transposed file as CSV
How it works
- Upload your CSV. Open your CSV file in the viewer. Any file size is supported.
- Apply the transpose. Open the File menu and choose 'Transpose CSV'. Rows and columns are swapped instantly.
- Download the result. The transposed CSV downloads immediately. Your original column headers are now the first column.
Frequently asked questions
What does transposing a CSV do?
Transposing flips the rows and columns of a CSV. Each column becomes a row and each row becomes a column. The original column headers move to the first column of the output.
When would I need to transpose a CSV?
Common uses include reformatting data for charting tools that expect a different orientation, restructuring exports from survey tools, and pivoting wide tables into long format.
Can I transpose a large CSV file?
Yes. The transpose runs server-side using DuckDB, so it works on files of any size without crashing your browser.
Is the CSV transpose tool free?
Yes, completely free. No account, no file size limit, no paywall.
What's the difference between transpose and pivot?
Transpose flips all rows and columns. A pivot table groups and aggregates rows by a category column — for example, summing revenue by region. Large CSV Viewer supports both.