Convert CSV to JSON Online



Free online CSV to JSON converter - no upload, no signup

Convert directly in your browser, with no upload waiting time, and no risk of data leaks.

Simply choose your CSV file and the tool will create a JSON file for you!

Choose CSV File to Convert

CSV File:
(Max 10M. Big than 10M?)
or drag & drop a CSV file here
 




How to Convert CSV to JSON (3 Steps)

  1. Choose your CSV file. Click the file picker or drag and drop a .csv file (up to 10M) into the box above.
  2. Convert. Press Convert and the tool parses the CSV in your browser and turns every row into a JSON object.
  3. Download the JSON. Save the generated .json file. The data never leaves your computer.

Online vs App

Same job, two ways — pick the one that fits your file:

OnlineApp
Free✓Trial
No install✓—
No upload✓✓
Large files / batch✗✓
GUI✓✓
CLI—✓

In short: this page is best for a quick, small file. For large files or batch jobs, use the DataFileConverter desktop app — it also ships a command line for scripts and scheduled runs.

What to Know About CSV to JSON

  • The first row is used as the JSON property names, so your CSV should have a header row.
  • Quoted fields, escaped quotes, commas inside values and UTF-8 text are handled correctly.
  • Conversion runs locally with JavaScript - your file is never uploaded to a server.
  • The free web tool accepts files up to 10M; for bigger or batch jobs use the offline app.

Frequently Asked Questions

Is this CSV to JSON converter free?

Yes. The online converter is completely free and needs no account or email.

Is my data uploaded to a server?

No. The conversion runs entirely in your browser, so your CSV never leaves your device.

What if my CSV has no header row?

The tool treats the first line as the header and uses it for the JSON keys, so add a header row first if your file does not have one.

How much bigger is JSON than CSV? See our measured comparison: CSV vs JSON vs XML: file size and speed compared.

Related Tools

Excel to JSON | XML to JSON | SQL to JSON | JSON to CSV | Merge CSV files | Split CSV file

Need bigger files or batch conversion?

If this service cannot convert your data correctly, or your files are big than 10M, or you want a batch conversion, you can use Data File Converter to Convert CSV to JSON Offline.

Want to stay in the browser? Subscribe (from $5/month) to raise the online limits.

If you have any question or suggestion, please contact us.