Convert Excel to Parquet Online
Convert Excel files to Parquet format directly in your browser. No upload required — your data never leaves your device.
About this conversion
Converting Excel to Parquet transforms a spreadsheet export into a format optimised for analytical processing. Parquet's columnar structure and compression make it significantly more efficient than XLSX for querying and storage — a typical Excel file compresses to 20–40% of its original size. The column schema is embedded in the Parquet file, so downstream tools read types without manual annotation.
Common use cases include loading monthly Excel reports from a business team into a data lake on S3 or GCS, preparing Excel exports for querying with Athena, BigQuery, or DuckDB, and archiving large spreadsheets in a more storage-efficient format. This is a key step for data engineers who receive data as Excel files and need to incorporate it into automated analytical pipelines.
Excel date serial numbers are automatically converted to proper timestamps in the Parquet output. Formulas are converted to their last calculated values. Only the first sheet is exported. Complex Excel features like merged cells, conditional formatting, and charts are not represented in Parquet — only the raw cell values and their inferred types.
Not sure which format you need? Read our Excel vs CSV comparison for a side-by-side breakdown.
Frequently Asked Questions
What is Parquet format?
Parquet is an open-source columnar storage format designed for efficient analytics. It compresses far better than CSV and is natively supported by Spark, Athena, BigQuery, Pandas, and DuckDB.
Is my Excel data private?
Yes — completely. Your file is never uploaded to any server. All conversion happens inside your browser using WebAssembly — locally, with no upload. Once you close the tab, nothing is retained.
What is the maximum file size?
The free limit is 50 MB. For larger files, performance depends on your device's available memory — most modern machines can handle 500 MB to 1 GB comfortably.
What is the difference between Excel and Parquet?
Excel is for end-user analysis. Parquet is better for loading into data warehouses or running analytical queries at scale.
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