Is my YAML data uploaded to a server?

No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

How are nested values handled?

Nested objects and arrays are serialized as inline JSON inside the corresponding CSV cell.

What if rows have different keys?

The CSV header is the union of the columns of all rows, so no data is lost; missing values are left empty.

100% local — your data never leaves your browser

YAML to CSV Converter — Free Online Tool

Convert a YAML sequence of objects to CSV instantly in your browser. Free, private and offline-friendly: your data never leaves your device.

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Swap: CSV → YAML

YAML input

CSV output

Why convert YAML to CSV?

YAML is great for configuration and fixtures, but spreadsheets and data tools want CSV. Paste a YAML sequence of objects above and get a CSV file in milliseconds, ready to open in Excel or import anywhere.

How it works

The converter parses your YAML locally and turns each object of the sequence into a CSV row. The header is the union of the columns found across all rows, and nested values are serialized as inline JSON so nothing is lost.

Frequently asked questions

Is my YAML data uploaded to a server?: No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
How are nested values handled?: Nested objects and arrays are serialized as inline JSON inside the corresponding CSV cell.
What if rows have different keys?: The CSV header is the union of the columns of all rows, so no data is lost; missing values are left empty.