What YAML structure does it produce?

A top-level sequence (list) where each item is a mapping of column name to cell value. In block style each row is a `- key: value` block; in flow style each row is an inline `{key: value}` map.

When are values quoted?

Strings that could be misread as YAML — empty values, leading or trailing spaces, special characters like colon-space, #, or values that look like booleans or numbers but should stay text — are wrapped in double quotes with internal quotes escaped.

What does inferring numbers and booleans do?

When enabled, clean numeric literals become YAML numbers and the words true/false/null become their YAML equivalents (unquoted). Turn it off to keep every value as a quoted or plain string.

Does it handle quoted CSV fields with commas?

Yes. The parser follows RFC 4180, so quoted fields containing commas, doubled quotes, and embedded line breaks are parsed correctly instead of split on every comma.

Is my data uploaded anywhere?

No. Parsing and YAML generation happen entirely in your browser with JavaScript. Your CSV never leaves your device.

CSV to YAML Converter

Convert CSV to YAML

This tool turns a CSV file with a header row into a YAML list of mappings — one mapping per row, keyed by the column names. It is handy for generating config files, Ansible vars, CI matrices, or seed data from a spreadsheet export.

How it works

The CSV is parsed with an RFC 4180 scanner so quoted fields with embedded commas, doubled quotes (""), and line breaks are handled correctly. The first row supplies the keys; each later row becomes a mapping in a top-level sequence.

Each value is serialised safely. A scalar is emitted plain (unquoted) only when it is safe to do so; otherwise it is double-quoted with internal quotes and backslashes escaped. This protects values that contain : (colon-space), a leading #, leading or trailing whitespace, or that would otherwise be parsed as a boolean or number. With “infer numbers and booleans” on, clean numeric literals and the words true, false, and null are emitted unquoted as their YAML types.

Tips

Use block style for human-readable config you will edit by hand, and flow style when you want compact one-line-per-record output. If a column holds identifiers such as 007 or phone numbers, turn off number inference so leading zeros and + prefixes are preserved as strings.