YAML to CSV Converter

How to use

1. 1Paste a YAML document into the YAML input panel, or click Load sample to see a working example.
2. 2Pick the delimiter that matches the consumer of the CSV: Comma, Semicolon, Tab, or Pipe.
3. 3Pick line endings: LF for Unix and macOS, CRLF for Windows and Excel.
4. 4Choose Flatten with dotted keys to expand nested mappings into columns, or Keep as JSON strings to keep nested values inside a single cell.
5. 5Toggle Include header row, Quote every field, and Add UTF-8 BOM to match your downstream tool's expectations.
6. 6Click Copy CSV or Download .csv to save the result. Nothing is uploaded.

About this tool

YAML to CSV Converter turns YAML 1.2 documents into RFC 4180-compliant CSV, entirely in your browser. The parser handles the shapes that real-world YAML files take: a top-level sequence of mappings (the canonical "table" format used by Ansible inventories, Helm values lists, GitHub Actions matrix entries, Rails fixtures, and OpenAPI example sections), a mapping that envelopes the data array under a single key, multi-document streams separated by the YAML document marker, and standalone scalar values. Block and flow styles are both accepted, along with literal (|) and folded (>) block scalars with strip and keep chomping indicators, plain / single-quoted / double-quoted scalars, the YAML 1.2 core schema typing rules for booleans / null / integers / floats, comments, and anchors with aliases so DRY YAML files round-trip correctly. Nested mappings and sequences can be flattened into dotted column names (address.city, tags.0) so spreadsheets ingest them cleanly, or kept as JSON strings inside one cell when the consumer wants to preserve the nested structure. The CSV emitter follows RFC 4180 quoting rules: fields containing the delimiter, a double quote, CR, or LF are wrapped in double quotes and inner quotes are doubled. Output controls cover delimiter (comma, semicolon, tab, pipe), line endings (LF or CRLF), header row inclusion, an Always quote toggle for strict consumers, and a UTF-8 BOM prefix so Excel opens Unicode CSVs cleanly on Windows. The result panel shows row count, column count, byte size, and the detected YAML shape so you can verify the table matches your data. Parsing and CSV emission both run locally on your device, so the YAML pasted here never leaves your browser. Useful for turning Kubernetes manifests, Ansible host lists, Helm values, OpenAPI examples, Rails or Laravel database fixtures, GitHub Actions job matrices, and any other YAML-shaped data into spreadsheets, BI tools, or downstream pipelines that expect CSV.

Free to use. Works in your browser. No signup, no login.