How to convert CSV to JSON
- 1 Drop your CSV files onto the page, or click “Choose files”. You can add many at once, or a whole folder.
- 2 JSON is already selected as the output. Optionally open Options to adjust indent, sort keys.
- 3 Click Convert, then Save. Converting several files? Save them all as one ZIP.
About the formats
CSV · Comma-separated values
CSV is a simple table format: one row per line, columns separated by commas. Every spreadsheet and database can import it.
JSON · JavaScript Object Notation
JSON is the most common data format for APIs, configuration files and web apps.
The conversion runs on your device using proper parsers for each format (yaml, smol-toml, fast-xml-parser and PapaParse). You can adjust: indent, sort keys.
Frequently asked questions
How do I convert CSV to JSON?
Drop your CSV files onto the page, or click “Choose files”. You can add many at once, or a whole folder. JSON is already selected as the output. Optionally open Options to adjust indent, sort keys. Click Convert, then Save. Converting several files? Save them all as one ZIP.
Are my files uploaded to a server?
No. The conversion runs entirely in your browser using WebAssembly. Your files never leave your device, so it is safe for private photos, contracts and business data. Once the page has loaded it even works offline.
Will converting CSV to JSON reduce quality?
No. CSV to JSON conversion is exact: the data is parsed and rewritten, not approximated.
Can I convert multiple CSV files to JSON at once?
Yes. Add as many CSV files as you like; they are converted in parallel on your device and you can download them all as a single ZIP.
Is it free? Are there limits?
It is free, with no sign-up, no watermark and no daily limits. Because nothing is uploaded there is no upload size limit either; the only limit is your device’s memory, which matters mostly for very large videos.
Convert CSV to other formats
Convert other formats to JSON
See everything the CSV converter and the JSON converter can do.