ToolNestFree YAML to XML Converter
Last updated: November 9, 2026
Quick answer: Configuration lives in YAML, but legacy systems still want XML — SOAP APIs, ERP imports, product feeds, and government data exchanges all expect angle brackets where your config file has indentation. This free YAML to XML converter bridges the gap: paste your YAML or upload the file and it returns well-formed XML with a proper declaration, a root element you name, nested maps turned into nested elements, and lists turned into repeated <item> elements inside a wrapper. Block scalars keep their line breaks, quoted strings survive colons and # characters, and null values become honest self-closing elements. Everything runs in your browser, so your config files never leave your device.
Conventions: a nested map becomes nested elements; a list becomes a wrapper element holding repeated <item> elements (a list of maps gives one <item> per map, each holding the map's elements); null, ~, and empty values become self-closing elements; numbers and booleans are emitted as text exactly as written, so 007 stays 007; keys that are not valid XML names (starting with a digit, containing spaces) are sanitized with underscores; duplicate keys are an error, not silently merged. Anchors (&name), aliases (*name), merge keys (<<), and multi-document files (---) are not supported — expand them first with yq or Python. Tabs are not valid YAML indentation and are rejected. Your YAML is parsed locally — nothing is uploaded.
✓ Free forever · ✓ No signup · ✓ Tool inputs stay in your browser — never sent to our servers.
How to Use the YAML to XML Converter
- Paste your YAML into the box, or use the file picker to load a .yaml / .yml file — the contents load into the editor automatically.
- Name your root element. XML requires exactly one root, so the converter wraps your document in one: 'data' by default, or 'config', 'settings', 'feed', or whatever your target schema demands.
- Pick your indentation and decide whether to include the XML declaration. Two spaces matches most hand-written XML; four spaces matches most generated files.
- Press Convert to XML. If the YAML has a problem, the error names the line — fix it there and convert again. Copy the result or Download .xml and paste it straight into your import tool, SOAP request, or feed validator.
- Check the list convention before you hand the file on: lists become a wrapper element holding repeated <item> elements, and null values become self-closing elements. The note under the output spells out every convention so the receiving system never surprises you.
Why Use Our YAML to XML Converter?
- Real indentation-based parsing — nested maps, sequences, and block scalars are parsed from the indentation structure, not with regex line-splitting. A two-space indent means a child; a four-space indent means a grandchild; the converter follows the structure your YAML actually declares.
- Lists become repeated <item> elements — a list under a key becomes a wrapper element holding one <item> per entry, and a list of maps gives one <item> per map with the map's fields nested inside. The convention is written on the page, so the output is predictable instead of a surprise per converter.
- Block scalars preserved — literal blocks (|) keep their line breaks and folded blocks (>) join lines with spaces, so multi-line descriptions, SQL snippets, and shell commands survive the conversion instead of collapsing into one line.
- Quoted strings handled — single- and double-quoted values survive colons, # characters, and leading special characters that would otherwise be read as YAML syntax. A value like "http://example.com:8080" or 'price: $5' converts exactly as written.
- Nulls and empties are honest — null, ~, and empty values become self-closing elements (<nickname />), so the consuming system sees the field exists with no value instead of the field silently disappearing from the document.
- Private by design — parsing happens entirely in your browser. Your config files never leave your device.
Common Use Cases
- Feeding a legacy SOAP or ERP import from a YAML config: Your application keeps its settings in YAML, but the ERP's import wizard accepts only XML with a specific root layout. Paste the config, name the root to the import's expected name, convert, and you have an import file to test in minutes — without installing a YAML library for a one-off file.
- Turning app config into an XML feed: A partner system wants an XML feed of your product or content settings, and the source of truth is a YAML file in the repo. Convert it, keep the nested maps as nested elements so the feed's field mapping lines up, and validate the output against the feed spec — faster than hand-writing angle brackets for a hundred settings.
- Converting API test fixtures into XML payloads: Test fixtures live in YAML because humans edit them, while the API under test accepts only XML payloads. Convert the fixture, keep the list convention in mind (one <item> per entry), and post the result — the declaration and indentation controls make the payload readable when the API rejects a row and you have to find it.
- Teaching the YAML/XML mapping: Students grasp the format difference fastest by converting the same data both ways: indentation becomes nesting, sequences become repeated elements, and the null rule shows exactly where the two models disagree. The sample button gives a classroom-ready example in one click.
YAML to XML Converter vs Alternatives
- Online YAML Tools: The #1 incumbent for this exact conversion, and a clean single-purpose converter. It is a solid tool — but a multi-tool site where the converter shares the page with surrounding content, and its list convention is not spelled out on the page. This page documents its conventions (lists as <item>, nulls as self-closing, anchors unsupported) in the note under the output, so you know exactly what the XML will look like before you paste.
- JSON Formatter's YAML to XML: A solid converter inside a large formatter suite — good for a quick paste when you are already on the site. The trade-off is the same as any suite tool: the converter is one tab among many, and the output conventions are not documented on the page. This page is one converter with its YAML rules (block scalars, quoted strings, duplicate keys) written out, plus root-name and indentation controls.
- Browserling: A simple no-frills converter — paste YAML, get XML. Useful when you want zero options. This page adds the controls a target system actually needs: a custom root element name, indentation choices, file upload, and download as .xml, plus the error line number when the YAML is invalid.
- Python (PyYAML + xml.etree / dicttoxml): The power option for automation: yaml.safe_load, build an ElementTree or run dicttoxml, write it out — scriptable and repeatable, and it handles files far larger than a browser textarea, anchors included. But it needs Python installed and a few lines of code; this page converts the one-off file on your desk in seconds with no setup.
Online converters will convert your YAML if you paste it, and Python will convert it inside a script. For a one-off conversion with documented list and null conventions, honest block-scalar handling, values that keep their leading zeros, and zero upload of your data, this page is the fastest private route from YAML to well-formed XML.
Frequently Asked Questions
How do I convert YAML to XML online for free?
Paste your YAML into the box above (or upload the .yaml / .yml file), name the root element your target system expects, pick your indentation, and press Convert to XML. The output appears instantly with a declaration and proper indentation — then copy it or download the .xml file. No signup, no install, no upload.
How are lists converted to XML?
A list under a key becomes a wrapper element holding one <item> per entry. For example, languages: [Python, JavaScript] becomes <languages><item>Python</item><item>JavaScript</item></languages>. A list of maps gives one <item> per map, each holding that map's elements. A top-level list becomes repeated <item> elements directly under the root.
How are nested maps handled?
Each level of nesting becomes a level of elements: address: city: London becomes <address><city>London</city></address>. The indentation depth in your YAML is the element depth in the XML, so a three-level config produces a three-level document with no flattening.
What happens to multi-line strings?
Literal block scalars (|) keep their line breaks exactly, and folded block scalars (>) join lines with spaces, with blank lines kept as paragraph breaks — the same rules YAML itself uses. Chomp indicators work too: |- strips the final newline and |+ keeps extra trailing blank lines.
What happens to null, ~, and empty values?
They become self-closing elements — <nickname /> — which is the honest XML representation of 'present but empty'. The element is still there, so the consuming system sees the field exists with no value, instead of the field silently disappearing from the document.
Do anchors, aliases, and merge keys work?
No — anchors (&name), aliases (*name), merge keys (<<), and multi-document files (---) are not supported, and the converter says so instead of silently producing wrong XML. Expand them first with yq or Python (yaml.safe_load then yaml.dump gives you plain YAML), then convert the expanded file here. Most browser converters skip anchors too; this page states the limit up front.
Are numbers and booleans kept as text?
Yes — everything is emitted as text exactly as written, because XML has no native number or boolean type; the consuming parser decides the type. That is also why leading zeros survive: 007 stays <code>007</code> instead of being coerced to 7 the way type-inferring converters do.
Is my data uploaded anywhere?
No. The entire conversion runs in JavaScript in your browser — the YAML never touches a server. Safe for config files with hostnames, keys, internal URLs, or credentials.