Use the free CSV to YAML Converter below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
Why Convert CSV to YAML
CSV is the format spreadsheets speak. Export a table from Excel or Google Sheets and you get rows of values separated by commas. YAML is the format config files and many developer tools speak: indented, readable, and structured. When a table needs to become config data, seed data for an application, or input for a static site generator, converting CSV to YAML is the bridge. Doing it by hand means retyping every row and risking a misaligned column, which is exactly the kind of boring, error-prone work a converter should remove.
This tool runs entirely in your browser with js-yaml. It parses CSV properly, including the tricky cases: fields wrapped in quotes, commas inside quoted fields, and even line breaks inside quoted fields. A naive split on commas would corrupt those rows. This parser does not.
How to Use the Converter
Paste CSV into the input box. Leave the header option checked if your first row contains column names, which is the usual case: the output becomes a list of records, one per row, with the column names as keys. Uncheck it if your CSV has no header row, and the output becomes a plain list of lists. Press Convert to YAML, then copy or download the result.
Try the sample first. It has three people with a name, an age, and a city, and one row where the name itself contains a comma, protected by quotes. Watch how that quoted comma stays inside the name instead of splitting the row. That single detail is the difference between a real CSV parser and a quick hack, and it is why this tool is safe for real exports.
What Happens to Your Data
Every value in CSV is text, and YAML output keeps it as text unless js-yaml recognises a plainer form. Ages like 36 stay as the text “36” in spirit, though YAML may print them unquoted, which most YAML readers then read back as numbers. That round-trip is usually fine, but if a column mixes codes like 001 with numbers, be aware that a YAML reader may normalise them. If exact text matters, such as product codes with leading zeros, check the output and quote those values in the receiving system.
Empty cells become empty strings, which is honest: the cell had nothing in it. Rows with fewer fields than the header get empty strings for the missing columns, and rows with extra fields get ignored beyond the header width in record mode. In list mode, every row keeps all of its fields. Trailing blank lines are skipped, so a file that ends with an extra newline does not produce a phantom empty record.
Real Uses for CSV to YAML
Static site generators often take data files in YAML. A content team that maintains a table of products, events, or team members in a spreadsheet can export CSV, convert it here, and drop the YAML into the site’s data folder. Test fixtures are another use: a table of test cases becomes a readable YAML list that a test runner can load. Seed data for a new application, translation tables, and small catalogs all follow the same pattern: humans edit a table, machines read YAML.
It also helps with cleaning data. Converting to YAML and reading it back often reveals problems invisible in a spreadsheet: a row with a missing field, a value that landed in the wrong column, or a duplicated header. The indented YAML layout makes each record’s shape obvious, so anomalies stand out.
Frequently Asked Questions
Does it handle semicolon-separated files? No. This tool expects commas, the CSV standard. If your spreadsheet exports with semicolons, change the export separator to a comma first.
What if my CSV has no header? Uncheck the header option. You get a list of lists, which keeps every value in order without inventing key names.
Is my data uploaded? No. Parsing and YAML writing happen in your browser. Your table never leaves your device.
Paste your CSV above and turn a spreadsheet export into clean YAML in one click.