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Convert CSV to JSON

Convert CSV to JSON arrays or objects, with type inference and nested key support.

100% Secure - your files are processed in your browser and never sent to a server.
Drop your file hereor click to browseSupports CSV, TSV, or TXT files (.csv, .tsv, .txt) (Max 100MB)

How to use the Convert CSV to JSON tool

  1. Load your CSV data: Drag and drop your CSV file, choose a file from your file explorer, or paste CSV data directly into the paste area.
  2. Configure output settings: Select the input delimiter, toggle header row, and enable or disable automatic type inference (converts numbers and booleans).
  3. Convert to JSON: Click the "Convert Data" button to convert each CSV row into a JSON object in an array.
  4. Export results: Copy the JSON output to your clipboard or download it as a file.

Frequently asked questions

Is it safe to use Convert CSV to JSON with sensitive or confidential data?
Yes, completely. All processing done by Convert CSV to JSON runs 100% client-side inside your local web browser using a background Web Worker thread. Your data is never uploaded, transmitted, or stored on any server, not even temporarily.
What is the maximum file size Convert CSV to JSON can handle?
Convert CSV to JSON supports files up to 100 MB. Because all parsing happens inside your browser's memory rather than on a server, performance scales with your computer's available RAM. The Web Worker architecture keeps the UI fully responsive even during heavy processing.
How does Convert CSV to JSON process my data without uploading it?
Convert CSV to JSON uses modern browser File and Blob APIs alongside battle-tested open-source libraries (such as PapaParse and SheetJS) bundled directly into the page. When you load a file or paste data, the browser reads it into local memory and the conversion runs entirely inside a sandboxed Web Worker thread. No network call is ever made.
Do I need to install anything to use Convert CSV to JSON?
No installation, browser extension, or plugin is required. Convert CSV to JSON runs as a standard web page inside any modern browser. Simply open it, load your data, and download the output. Nothing to install and nothing to uninstall.
Does Convert CSV to JSON work offline after the page has loaded?
Yes. Once Convert CSV to JSON has finished loading in your browser, the conversion engine itself requires no active internet connection. You can disconnect from the network and continue converting files; all processing stays fully on-device.

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