Convert CSV to JSON
Free CSV to JSON converter that runs entirely in your browser. No uploads, no signup required.
Drop CSV files here
or browse your device. Free, no signup required, no watermarks.
Files are processed on your device, never uploaded
Three steps
How to convert CSV to JSON
Add your files
Drop CSV files into the box above, or click it to browse. Add several to batch convert.
Convert
JSON is already selected as the output. Hit Convert. Your browser does the work locally.
Download
Save each converted JSON file. Pro ZIPs whole batches in one click.
Comma-separated values
CSV
CSV is the simplest spreadsheet format: rows of comma-separated values that Excel, Sheets, and databases all read.
JavaScript Object Notation
JSON
JSON is the universal data format of APIs and web apps: structured, human-readable, and machine-friendly.
Why convert CSV to JSON?
CSV is the simplest spreadsheet format: rows of comma-separated values that Excel, Sheets, and databases all read. JSON is the universal data format of APIs and web apps: structured, human-readable, and machine-friendly. Converting from CSV to JSON gets you the best of the target format wherever CSV falls short, whether that's compatibility, file size, or what your apps and devices can open. With FormatFusion the switch takes seconds and your files stay on your device the whole time.
Questions
CSV to JSON: common questions
Is this CSV to JSON converter free?
Yes. It is completely free with no watermarks and no account required, for files up to 1 GB each. Convert one file or a hundred.
Is it safe to convert CSV files here?
Safer than any upload-based converter. The conversion runs locally in your browser, so your CSV files are never sent over the internet and never touch a server.
Will I lose quality converting CSV to JSON?
No. This conversion preserves your content, and JSON output keeps everything the format supports.
Can I convert multiple CSV files at once?
Yes. Free converts up to three CSV files at a time. FormatFusion Pro batches without limits and downloads whole runs as a single ZIP.
Does it work on iPhone and Android?
Yes. FormatFusion runs in any modern mobile or desktop browser. No app install needed.