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Data & Spreadsheets

CSV to Parquet.

Convert bounded CSV to Parquet with reviewable strict inference or all-text schema and Snappy or uncompressed output. Data stays in this browser. Convert bounded CSV to Parquet with reviewable strict inference or all-text schema and Snappy or uncompressed output.

Use CSV to Parquet

Private in this browser. Bytes, schema, values and outputs stay in this browser.

No file selected.
Tool options

Options appear after the file is inspected locally.

Preparing the local tool…

How it works

  1. 01

    Choose local data and review the options.

  2. 02

    Run the bounded operation in a worker.

  3. 03

    Download only the independently verified result.

Frequently asked questions

Is data uploaded?

No. The operation runs locally.

Does CSV to Parquet upload my data?

CSV to Parquet runs locally in your browser. Bytes, schema, values and outputs stay in this browser.

What output does CSV to Parquet create?

CSV to Parquet creates Parquet output after the result passes its local verification checks.

Large CSV ViewerStream, search and page through a CSV locally while keeping every value as text, then independently rescan the source before downloading a bounded JSON report.Data AnonymizerMask, hash, tokenize, generalize or synthesize selected CSV columns locally, then independently reparse and verify every transformed cell before download.CSV CleanerReview detected delimiter and UTF-8/UTF-16 encoding, then repair whitespace, blank rows, quoting and newlines to normalized UTF-8 CSV.
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