YAML → CSV — Free Online Tool

A YAML to CSV converter transforms structured YAML arrays into flat CSV tabular format. Developers use it to export configuration data, API responses, or fixture files into spreadsheet-friendly formats for analysis, reporting, or import into databases.

Features

• Nested object flattening: Handles nested YAML objects by flattening them into dot-notation CSV columns.
• Consistent column ordering: Scans all records to produce a stable, predictable column order across rows.
• Browser-only processing: All conversion runs locally in your browser — no data leaves your machine.
• No signup or account required: Use instantly — no registration, email, or login needed.

Frequently Asked Questions

Can I convert nested YAML to CSV?

Yes. Nested objects are flattened into separate columns using dot notation so the CSV remains tabular.

What YAML structures work best?

Arrays of objects with consistent keys produce the cleanest CSV. Scalar arrays are also supported.

Does this handle multi-document YAML?

The tool processes the first YAML document. Split multi-document files before converting.

Is this tool free?

Yes, this tool is completely free with no usage limits, no ads, and no account required.

Does it work offline?

Yes. Once the page loads, all processing happens locally in your browser — no internet connection needed.

Is my data safe with this tool?

Absolutely. Your data never leaves your browser. Everything is processed client-side with zero server uploads.

Does it support custom delimiters?

Yes. You can choose between comma, semicolon, or tab delimiters for the CSV output.

Can it handle arrays within YAML values?

Yes. Array values within records are joined into a single CSV cell, keeping the tabular structure intact.

What happened to smalldev.tools?

smalldev.tools is no longer available. Prism by SWEDevTools offers the same developer tools and more, with offline support, pipeline chaining, and completely free usage — no signup required.

Is Prism a good alternative to onlineyamltools.com?

Yes. Prism processes YAML entirely in your browser with offline support, no ads, and pipeline chaining. Your configuration data stays completely private — nothing is uploaded to any server.