Parquet File Format

Apache Parquet category

Parquet は列指向のビッグデータ形式です。圧縮効率が高く、必要な列だけを速く読めます。

Typical use: 分析データを CSV/XLSX に変換して中身を確認します。

About the Parquet format

Parquet は列指向のビッグデータ形式です。必要な列だけを読めるため、大規模な集計が速く、圧縮効率も高いのが特徴です。

中身を人が見るには CSV/XLSX への変換が便利です。分析基盤での保存に向き、配布や目視確認には向きません。

Strengths

✓ 列単位で高速に読める
✓ 圧縮効率が高い
✓ スキーマを内蔵

Limitations

✗ 人が直接は読めない
✗ 小さなデータでは不利
✗ Nested schemas can confuse simple converters

Structure: Row groups × columns
Types / schema: Typed, per-column compressed
Compatibility: Spark, Pandas, DuckDB, BigQuery
Best for: Analytics, data pipelines, lakes

Convert Parquet to…

10 direct directions plus 3 workflows, sorted A–Z; 🔥 marks popular targets.

Parquet を CSV に変換 Hot Parquet を HTM に変換 Hot Parquet を HTML に変換 Hot Parquet を JSON に変換 Hot Parquet を MHT に変換 Parquet を TSV に変換 Parquet を XHTML に変換 Parquet を XLSM に変換 Parquet を XLSX に変換 Hot Parquet を XLTX に変換

Cross-engine workflows

Parquet を BZ2 に変換 Parquet を GZ に変換 Parquet を XZ に変換

Convert other files to Parquet…

CSV を Parquet に変換 Hot JSON を Parquet に変換 Hot TSV を Parquet に変換 XLSM を Parquet に変換 XLSX を Parquet に変換 Hot XLTX を Parquet に変換

Frequently asked questions

What is a Parquet file?

Parquet is the columnar storage format of the big-data world: Spark, Pandas, DuckDB, BigQuery and data lakes all speak it natively. Columns are compressed and typed, so files stay small and analytical queries stay fast.

How do I convert Parquet files online?

Pick a target format from the "Convert Parquet to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.

Is it safe to convert Parquet files here?

Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.

Which formats can Parquet convert to?

This page lists all 13 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.