CSV to YAML Converter

CSV to YAML

Convert CSV rows to a YAML list of mappings. Paste CSV on the left; the YAML output builds on the right as you type.

id,name,role
1,Ada Lovelace,engineer
2,Grace Hopper,engineer

becomes

- id: 1
  name: Ada Lovelace
  role: engineer
- id: 2
  name: Grace Hopper
  role: engineer

The header row supplies the keys, and each remaining CSV row becomes one item in the YAML sequence. id comes out as the plain number 1, not a quoted string, because Coerce types is on by default.

Type coercion into YAML

With Coerce types on, a cell reading 42, true, false, or null becomes that YAML type, written bare with no quotes. Anything else stays a quoted or plain string depending on what the YAML serializer decides it needs. This matters for downstream tools that check types strictly, a boolean field read as the string "true" behaves differently from the real boolean true in most YAML-consuming code.

Delimiter and header detection

Auto-detect scores comma, semicolon, tab, and pipe against your file’s first rows and picks whichever gives the most consistent column count, so most real CSV and semicolon-delimited exports convert correctly without touching the Delimiter control. Header row assumes your first line is column names; turn it off for headerless data and each row becomes a plain YAML list instead of a mapping.

After the conversion

If the resulting YAML needs cleanup, comment annotations, or key reordering, the YAML formatter validates and reformats it in place without touching the CSV source.