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Parquet Converter

Convert between Parquet and CSV formats entirely within your browser.

CSV → Parquet

  • ●Leading Zero Protection — With all_varchar=true, values like 00123 are preserved as text, never truncated to 123.
  • ●Columnar Compression — Parquet uses dictionary + RLE encoding, typically achieving 3-10x compression on CSV data.

Parquet → CSV

  • ●BOM Prefix — UTF-8 BOM (\ufeff) is auto-prepended so Excel opens the file without character corruption.
  • ●Type Serialization — Dates, timestamps, and decimals are serialized to human-readable strings.
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