CSV ↔ JSON ↔ XLSX Converter

Drag-drop tables, map columns, filter/dedupe, and convert locally. No uploads.

Everything processes locally in your browser. No files are uploaded.

Import

Drag & drop CSV / JSON / XLSX here

or Click to browse • Ctrl/⌘+V to paste

Detected format

CSV delimiter

For text & CSV imports

Header row

XLSX sheet

Paste box (optional)

Transform

Filter (contains)

Limit rows

De-dupe by columns

Trim cells

Columns

Select, rename, and reorder columns (drag handle).

Include

Rename

Export

Format

File name

CSV options

Delimiter

Quote char

Header row

UTF-8 BOM

JSON options

Shape

Indent spaces

XLSX options

Sheet name

Shortcuts: Ctrl/⌘+O open • Ctrl/⌘+S download • Ctrl/⌘+F filter

Preview

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Privacy: This page never uploads your data. Conversions happen entirely in your browser using JavaScript. XLSX support is powered by a local/ CDN copy of SheetJS.