Format-to-format tools for clean handoffs.

CSV → JSONTurn CSV rows into JSON records locally in the browser.
JSON → CSVConvert JSON arrays into CSV for spreadsheets and tools.
CSV → ParquetExport CSV data into columnar Parquet files.
Parquet → CSVFlatten Parquet datasets back into shareable CSV files.
JSON → ParquetTransform structured JSON data into Parquet.
Parquet → JSONInspect Parquet as JSON without leaving the browser.
CSV → Markdown TableGenerate markdown tables from CSV instantly.

Viewers & compare

Inspect, search, and spot differences locally.

ビューアOpen large CSV files in a fast local-first data grid.
比較するReview two CSV files side by side without uploads.
ExcelビューアInspect old Excel files directly in the browser.
Parquet ビューアPreview Parquet columns and rows with grid controls.

Excel workflows

Move between CSV/Excel/JSON while staying in-browser.

CSV→エクセルConvert CSV into Excel-ready files for office workflows.
エクセル→CSVExtract CSV from legacy Excel spreadsheets.
JSON → ExcelCreate Excel output from structured JSON data.

Learn & product

Docs, hubs, and key pages.

ガイドRead practical guides for CSV cleanup and conversion.
ツールBrowse the full tool library by workflow and category.
ブログExplore articles about file workflows and privacy.
プライバシーSee how local-first processing protects your data.
利用規約Review terms for the product and website.

Color tools, generators, and gallery-style inspiration.

Color palette generatorBuild palettes and explore combinations for brand work.
Gradient generatorCreate bold gradients for interfaces and assets.
Trending palettesBrowse popular palette collections and ideas.
Trending gradientsScan standout gradients curated from the gallery.

Local-first converters, viewers, and file tools

Local-first tools

Table tool directory

Convert, compare, and review tabular files in your browser. Use the categories below to find the right workflow fast—without uploading sensitive data to unknown servers.

Converters

CSV → JSON
JSON → CSV
CSV → Parquet
Parquet → CSV
JSON → Parquet
Parquet → JSON
CSV → Markdown Table

Viewers & compare

ビューア
比較する
Excelビューア
Parquet ビューア

Excel workflows

CSV→エクセル
エクセル→CSV
JSON → Excel

Learn & product

ガイド
ツール
ブログ
プライバシー
利用規約

Color

Color palette generator
Gradient generator
Trending palettes
Trending gradients

Table

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CSV to JSON ビューアおよびエディタ

CSV をインポートします (最大 200 MB、最大 50,000 行がロードされます)。

ヘッダー行が必要です。メインの CSV ビューアと同じルールです。