CSV Input

YAML Output

What is CSV to YAML Converter?

Need to convert your CSV (Comma-Separated Values) data to YAML (YAML Ain't Markup Language)? This tool does that instantly. CSV is what spreadsheets export; YAML is what a lot of config and static-site tooling reads. This converter turns each CSV row into one mapping in a YAML list, keyed by the header row.

A typical use is a data file: Jekyll data files, Ansible variable lists or test fixtures, where someone maintains the list in a spreadsheet. Values that YAML would otherwise misread are quoted for you: yes, no, 00123, 0x1A and 19-digit IDs stay strings instead of turning into booleans or rounded numbers. A quoted cell with line breaks comes out as a YAML block scalar.

The output is always a flat list of mappings, one per row. It won't build nested structures like a Kubernetes Deployment from columns; if you need that, convert here and then reshape the YAML by hand. Conversion runs in your browser and nothing is uploaded.

How It Works

Three steps. The conversion runs as you type.

Paste or Upload CSV

Paste your CSV data into the left editor, or click "Upload" to load a .csv or .txt file. Click "Sample" to see example CSV data. Comma, semicolon, tab and pipe delimiters are detected from the first rows.

Automatic Conversion

The converter processes your CSV instantly. The first row becomes YAML keys, and each subsequent row becomes a YAML object. Empty cells and the word null become YAML null. The YAML list appears on the right.

Copy or Download

Take the YAML with "Copy", or press "Download" for a .yaml or .yml file. Drop it into a data folder, a fixture file or a config that expects a list.

Use Cases

Static Site Data Files

Keep a team page, product catalogue or event list in a spreadsheet, export CSV, and paste the YAML into your site generator's data folder.

Test Fixtures

Turn a QA spreadsheet of orders (order ORD-1042, SKU-101, qty 3) into a YAML fixture your test suite loads, without hand-typing every row.

Configuration Files

Convert a sheet of feature flags, user lists or host inventories into a YAML list that your app or an Ansible playbook reads as variables.

Seed Data

Many frameworks can seed a database from YAML. Export the CSV from the spreadsheet your ops team maintains and get a seed file in one paste.

Common Questions

How are CSV headers handled?

The first row of your CSV becomes the YAML keys. Each subsequent row becomes a YAML object with those keys. For example, headers name,age,city give list items like - name: Ava Chen with age and city under them. Blank headers become column_N and duplicates get _2, _3.

What if my CSV has special characters?

The converter properly escapes special characters in YAML. Quotes, colons, and other YAML-reserved characters are converted to valid YAML strings automatically, following YAML 1.2 specifications.

Can I convert CSV without headers?

Not directly: the first row is always used as the keys. If your file has no header, add a line like sku,qty,price at the top first, otherwise your first data row becomes the key names.

What YAML format is produced?

The output is a YAML array of objects. Each CSV row becomes one object in the array. This format is compatible with YAML 1.2 specifications and works with all YAML parsers.

Is my data safe?

Absolutely. All conversion happens in your browser using JavaScript. Your CSV data never leaves your computer – no server uploads, no storage, completely private.

Can I use this for Kubernetes manifests?

Only as a starting point. The output is valid YAML, but it's a flat list of rows, not a manifest with apiVersion, kind and nested spec. It works well for a list of values you'll paste into a ConfigMap or a Helm values file and then shape by hand.

Related Tools

CSV conversion is just one part of data workflow. Here are other tools:

CSV to YAML Converter