Convert Parquet to Excel Online
Convert Parquet files to Excel format directly in your browser. No upload required — your data never leaves your device.
About converting Parquet to Excel
Parquet to Excel is how warehouse results reach finance, operations and sales teams. An analyst runs a query in Athena, BigQuery or Databricks, the result lands as Parquet, and the person asking for it wants a workbook they can filter, pivot and email. Converting avoids a round trip through Python or a BI tool just to produce an .xlsx file.
The workbook has one sheet, named Sheet1, with the column names in the first row. Excel stops at 1,048,576 rows, so a large fact table has to be filtered, aggregated or sampled first. The SQL Query tool can do that before you export.
The main surprise is that Parquet types do not all become native Excel types. Plain integers, doubles and booleans do. DECIMAL columns arrive as text, so SUM ignores them and Excel marks the cells as numbers stored as text. Dates and timestamps also arrive as text rather than Excel date serials. Excel stores numbers with 15 significant digits, so a 16-digit ID that fits in a normal number cell loses its last digit. If a column is an identifier rather than a quantity, cast it to VARCHAR first.
Not sure which format you need? Read the Excel vs Parquet comparison.
Worked example
A small orders export with an ID, a customer name, a date, an amount (one missing) and a true/false flag, converted with the default settings.
Input (Parquet)
Parquet file (binary, columnar) — shown as a table with its schema
| order_id | customer | order_date | amount | shipped |
|---|---|---|---|---|
| 1001 | Acme Ltd | 2026-03-02 | 249.5 | true |
| 1002 | Brightside Co | 2026-03-02 | 1200 | false |
| 1003 | Acme Ltd | 2026-03-05 | 89.99 | true |
| 1004 | Northwind | 2026-03-07 | NULL | false |
Schema: order_id BIGINT, customer VARCHAR, order_date DATE, amount DOUBLE, shipped BOOLEAN
Output (Excel)
Excel workbook, first sheet (Sheet1)
| order_id | customer | order_date | amount | shipped |
|---|---|---|---|---|
| 1001 | Acme Ltd | 2026-03-02 | 249.5 | true |
| 1002 | Brightside Co | 2026-03-02 | 1200 | false |
| 1003 | Acme Ltd | 2026-03-05 | 89.99 | true |
| 1004 | Northwind | 2026-03-07 | NULL | false |
What changes when you convert Parquet to Excel
- BIGINT and DOUBLE become numeric cells, and BOOLEAN becomes a TRUE or FALSE cell.
- DECIMAL values such as 249.50 become text cells. Use Text to Columns or VALUE() in Excel, or cast the column to DOUBLE before converting, if you need to add them up.
- DATE and TIMESTAMP values become text such as 2026-03-02 09:15:00, not date-formatted cells. Timezone-aware timestamps are shown in UTC.
- NULL becomes an empty cell. Order 1004 has a blank amount.
- Struct, list and map cells are written as JSON text, such as {"city":"Leeds"}. Select the nested fields as their own columns in the SQL Query tool first if people need to filter on them.
Your file is processed locally in your browser and is never uploaded. The free limit is 50 MB per file; larger files work if your device has the memory for them.
Frequently Asked Questions
Why does SUM return 0 for my amount column?
The column is DECIMAL in Parquet and is written as text to keep its exact digits. Excel does not sum text. Convert the cells with VALUE() or Data, Text to Columns, or cast the column to DOUBLE in the SQL Query tool before converting.
Why does my nested column show JSON in the spreadsheet?
Excel cells hold single values, so struct and list values are written as JSON text. Pull the fields out first, for example SELECT address.city AS city, address.postcode AS postcode FROM the table, then export.
My Parquet file has more than a million rows. What can I do?
Excel cannot hold more than 1,048,576 rows per sheet. Aggregate with GROUP BY in the SQL Query tool, filter to the period you need, or convert to CSV and open it with Power Query, which can load more rows into the data model.
What is Excel format?
Excel (XLSX) is Microsoft's spreadsheet format, widely used in business. It supports multiple sheets, formulas, and formatting.
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