Convert CSV to JSON

Convert CSV files to JSON locally, completely free and with maximum privacy.

Drag and drop your files here

or click to browse local files (large files supported, limited only by browser RAM)

Upload Files

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How to convert CSV to JSON

Drop your .csv files above, or click Upload Files. You can add many files at once.
JSON is already selected as the output. Open the settings (gear icon) to fine-tune the result.
Click Convert All. SheetJS runs inside your browser through WebAssembly; nothing is uploaded.
Download your .json files as soon as each one finishes.

What to know about CSV to JSON conversion

JSON is best for APIs, JavaScript apps and data pipelines, and opens in code editors, browsers and every programming language.

CSV vs JSON

Feature	CSV (Comma-Separated Values)	JSON (JSON Table)
Multiple sheets	No	No
Formulas and formatting	No	No
Best for	importing data into databases, CRMs and apps	APIs, JavaScript apps and data pipelines
Opens in	any spreadsheet, database or text editor	code editors, browsers and every programming language

CSV (Comma-Separated Values): A plain-text tabular format where each line is a row and values are separated by commas.

JSON (JSON Table): Tabular data as a JSON array of row objects, ideal for APIs and JavaScript applications.

Conversion options

Active sheet only or all sheets
Custom output file name

Frequently asked questions

Is it safe to convert CSV to JSON here?

Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.

Is there a file size limit?

There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.

Can I convert several CSV files at once?

Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.

Related conversions

Need the opposite? Convert JSON to CSV.

Convert CSV to other formats

Convert other formats to JSON

See every CSV converter and JSON converter, or browse the full converter directory.