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Rhad ac am ddim CSV to JSON

Convert CSV (or TSV) into JSON — array of objects or arrays — with a proper RFC 4180 parser, delimiter auto-detection, and type conversion. Runs in your browser.

Dim cyfyngiad maint ffeilMae ffeiliau'n aros yn breifatNid oes angen mewngofnodiAm ddim am byth

Drop a CSV file (or paste below)

CSV, TSV, TXT dim cyfyngiad maint ffeil

Pori ffeiliau

CSV

JSON

—

First row is a headerConvert numbers & booleans

Delimiter

💡 A proper RFC 4180 parser — handles quoted fields, commas and line breaks inside quotes, and escaped quotes. With "first row is a header" on, you get an array of objects; off, an array of arrays. Everything runs in your browser.

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Convert CSV to JSON for an API Convert Messy CSV with Quotes and Commas Convert TSV (Tab-Separated) to JSON Prepare CSV Data for Import Quickly Inspect CSV as JSON

Sut Mae'n Gweithio

CSV looks simple but is full of edge cases — quoted fields, commas inside quotes, line breaks inside cells. This uses a proper RFC 4180 parser so those all work, entirely in your browser.

1
You paste CSV or drop a file
The delimiter (comma, semicolon, tab, or pipe) is auto-detected, or you can set it manually. Nothing is uploaded.
2
It's parsed correctly
Quoted fields, escaped quotes (""), and delimiters/newlines inside quotes are all handled per the CSV spec.
3
You choose the shape
With a header row, each line becomes an object keyed by the headers; without, an array of arrays. Optionally convert numbers and booleans to real types.
4
Copy or download JSON
Get clean, indented JSON ready for your code.