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Free XML Parser Online
This free tool allows you to parse XML, highlight syntax errors, and check DTD or XSD rules.
Categories
Paste well-formed XML. Optional DTD or XSD goes in the schema box.
Paste a DTD or an XSD. An internal DOCTYPE in the XML is also checked.
Parse XML
What is an XML parser?
An XML parser reads an XML document and turns it into a tree of elements, attributes, and text. This free online XML parser runs in your browser, highlights syntax errors by line, and can check a DTD or XSD after the document is well-formed. You paste or upload XML and inspect the structure without installing a library.
Testers use it on SOAP responses, RSS feeds, Android manifests, and app config files when the raw markup is too nested to scan by eye. All processing happens in your browser. No data is uploaded.
How to use the XML parser?
Paste a document, optionally add a schema, then parse. The tree, highlighted errors, and schema messages all stay on this page. All processing happens in your browser and no data is uploaded.
- Paste or upload XML: Enter markup in the input box, click Sample, upload a .xml or .txt file, or load text from a URL.
- Add a DTD or XSD (optional): Paste a schema in the DTD or XSD box, or keep an internal DOCTYPE in the document. Skip this step if you only need a well-formedness check.
- Parse the document: Click Parse XML, or leave Auto Update on. The parser builds a tree and then runs schema checks when a DTD or XSD is present.
- Review output: Read the tree when the document is well-formed. Syntax problems highlight the failing line. Schema failures list a path. Copy or download the parsed XML from Output.
What is the difference between well-formed XML and valid XML?
Well-formed and valid are not the same test. The table below shows what each one checks.
| Check | Well-formed XML | Valid XML |
|---|---|---|
| What it asks | Do tags nest, close, and quote attributes correctly? | Does the document also match a DTD or XSD? |
| Engine on this page | The browser DOMParser, with the failing line highlighted | A client-side check of ELEMENT, ATTLIST, and common XSD types |
| When it runs | Every parse | After the document is well-formed, if a DTD or XSD is present |
| Typical failure | A mismatched tag or a missing closer | An extra child, a missing required attribute, or a bad type |
Features of the XML parser
This parser is built for a quick look at a payload, not a full XML IDE. Here are the features of the XML parser:
- Tree view: Nested elements open as a collapsible tree so you can walk attributes and text without guessing.
- Error highlighting: Syntax failures mark the exact line and column in a source view, not a blank box.
- DTD and XSD checks: After the file is well-formed, declared elements, required attributes, and common types are checked.
- Browser-based processing: Parse, highlight, and validate stay in your browser so the document is never uploaded.
- File and URL input: Paste markup, upload a .xml or .txt file, or load text from an http or https URL.
- Parsed export: Copy or download the formatted XML produced from the parsed document, not the raw paste.
Use cases of the XML parser
People reach for an XML parser when a file looks legal but is hard to read, or when a schema should reject a field. Common uses:
- API response checks: Open a SOAP or REST XML body, confirm the tree, then send the same file through the XML Formatter when you need indented markup.
- Config and manifest review: Read Android resources, Spring config, or build files and catch a missing required attribute before a deploy.
- Schema spot checks: Paste a DTD or XSD here for a first pass, then use the XML Validator when you want a second dedicated validity run.
- Pretty-print after the tree looks right: Move the same document into XML Prettify when you need a file you can read in an editor.
- Hand-off to JSON: After you understand the shape, convert it with the XML to JSON Converter or inspect it again in the XML Viewer.
TestMu AI maintains this parser as part of its free developer toolkit, the same team that runs tests on 10,000+ real devices and 3000+ browsers.
Frequently Asked Questions (FAQs)
Why do I need to parse XML?
Parsing XML turns a raw document into a tree you can inspect. That check confirms tags nest correctly and that you can read elements, attributes, and text without guessing. Testers use it on API responses, config files, and exports before those files reach an application or a later formatter.
What should I do if my XML has errors?
Read the highlighted line and the message under Output. The parser marks the first syntax problem with its line and column so you can fix a mismatched tag or a missing closer. After you edit the input, parse again. Schema messages appear separately when a DTD or XSD rejects an element or attribute.
How can I format XML online?
Use the XML Prettify or XML Formatter tools on TestMu AI when you want indented markup instead of a tree. This parser focuses on structure, error location, and optional DTD or XSD checks. Pretty-print the same document after the tree looks right if you need a file you can read in a text editor.
Can I use this XML parser for large files?
Yes for typical payloads under a few hundred kilobytes. Paste the document, upload a .xml or .txt file, or load text from a URL. Auto Update waits a short moment while you type so large pastes stay usable. Very large dumps may feel slower because the tree is built in memory.
Is my XML data secure?
Yes. All processing happens in your browser. No data is uploaded to TestMu AI servers for parse, highlight, or schema checks. You can paste internal API responses or config files without sending them through a remote parser, which keeps those documents on the local page.
Does this tool validate XML against a DTD or XSD?
Yes. Paste a DTD or an XSD in the schema box, or keep an internal DOCTYPE in the document. After the file is well-formed, the parser checks element names, required attributes, allowed children, and common XSD types. Failures list a path and highlight the first matching line.
What is the difference between well-formed XML and valid XML?
Well-formed XML follows syntax rules such as matching tags and quoted attributes. Valid XML is well-formed and also matches a DTD or XSD that names the allowed elements and attributes. This parser reports both. A document can parse into a tree and still fail a schema check.
How do I parse an XML file?
Paste the markup, upload a .xml or .txt file, or load it from a URL. Click Parse XML, or leave Auto Update on. The tree appears under Output when the document is well-formed. Copy or download the parsed XML from that panel, not from the input box.
Does this XML parser work on mobile devices?
Yes. The page is usable in a mobile browser. Paste or upload XML, run Parse XML, and read the tree or the highlighted error line. Large files are easier on a desktop because the tree and the source view need more space, but the same checks run on a phone.
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