Skip to content
convertexa

CSV → JSON

CSV to JSON converter

convertexa converts CSV files to JSON locally in your browser using a dedicated data engine. Nothing is uploaded: the file is read, converted and handed straight back to you as a download.

  • Free, no sign-up
  • Nothing is uploaded
  • Works offline
Quality
Lossless
Runs
In your browser
Max input
25 MB
Status
stable

Drop a file to convert

Everything happens on your device — nothing is uploaded.

or paste with Ctrl+V

How to convert CSV to JSON

  1. 1 Drop your CSV file here.
  2. 2 Choose the output format.
  3. 3 Convert and download the result.

About CSV and JSON

CSV is plain text; the first row is treated as the header.

JSON is parsed and re-serialised, so key order is preserved and whitespace is normalised.

CSV files are read by the convertexa engine that ships with this page, so the conversion is identical whether you use this tool or the general converter. The output is produced with the same codec settings for every visitor, which means the same input always produces the same result.

Limitations

  • Values are all read as text; column types are not inferred.

Frequently asked questions

How do I convert a CSV file to JSON?

Add your CSV file to the box above. convertexa detects the format from the file content, applies the CSV to JSON conversion and gives you the result to download. The whole operation runs inside your browser.

Are my CSV files uploaded anywhere?

No. The conversion runs in a sandboxed worker on your own device. Your file never leaves the browser, and nothing is stored on a server.

Is the CSV to JSON conversion lossless?

Yes. This conversion preserves all of the source data, so the JSON file is equivalent to the original CSV file.

Is there a size limit?

For reliable results keep the input under 25 MB. Very large files run out of memory in the browser rather than failing quietly.

Which browsers are supported?

Any current version of Chrome, Edge, Firefox or Safari on a desktop. The conversion engines need WebAssembly and Web Workers, both of which are standard since 2018.