How it works
- Drop your file — CSV, XLSX, or XLS. Each sheet becomes a JSON array.
- Copy or download — pretty-printed by default; toggle minified if you prefer.
CSV to JSON Converter
Turn CSV and Excel spreadsheets into clean JSON — free, private, no sign-up. Your file never leaves your browser: conversion happens 100% on your device.
Convert CSV/Excel to JSON
Drop a .csv or .xlsx file here or click to browse
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Quick answers
How do I convert CSV to JSON?
Drop your .csv file here — the first row becomes the JSON keys, and each following row becomes an object. Copy the result or download it as .json.
Does it work with Excel files?
Yes — .xlsx and .xls are supported. Each worksheet becomes a named key with its own array of row objects.
Is my data uploaded anywhere?
No. Conversion runs entirely in your browser — safe for sensitive datasets.
Frequently asked questions
Is this CSV to JSON converter really free?
Yes — unlimited conversions, no account. It runs entirely in your browser.
How are column headers handled?
The first row of each sheet is used as the JSON object keys. Make sure your data has a header row.
What about Excel files with multiple sheets?
Each sheet becomes a top-level key in the JSON object, e.g. {"Sales": [...], "Inventory": [...]}.
Pretty-print or minified?
Pretty-printed (indented) by default for readability. Uncheck the box for compact single-line JSON.
Is my data uploaded anywhere?
No. Everything runs locally — your spreadsheets never touch our servers.