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About XML Validator — Free Online Tool
XML Validator reports whether a document is well-formed and, when it is not, gives the line and column of the first fault it meets.
Four conditions are tested: every opening tag has a matching close in the correct order, attribute values are quoted, comments are terminated, and there is exactly one top-level element. A document that passes reports its root element name, its tag count and whether an XML declaration is present. Well-formed is not the same as valid — no DTD and no XSD is consulted here, so a document can clear every check on this page and still be rejected by a schema that requires a particular element, order or data type.
The check runs in the page against the text you paste. Nothing is transmitted and no result is retained.
Confirming a feed is parseable before publishing it, finding the unclosed tag in a hand-edited config, checking a generated file inside a build, and verifying an export opens before you send it on.
Also known as: validate xml · xml syntax checker · check well formed xml
When to use it
Verify configuration files and web feed payloads before deployment to prevent runtime parsing crashes.
How it works
Runs native browser XML parser and captures parsererror node messages.
Detailed Error Trace
Points out the exact line and column of unclosed tags or illegal characters.
How to Use XML Validator in 4 Easy Steps
Follow this simple guide to process your files in seconds directly inside your browser tab.
Provide Input for XML Validator
Paste your payload, code snippet, or string into the XML Validator editor workspace. W3C XML 1.0 conformance validator that checks whether a document is well-formed.
Configure Formatting & Validation Rules
Select indentation preferences, minification, encoding options, or validation rules. Verify configuration files and web feed payloads before deployment to prevent runtime parsing crashes.
Run In-Browser Engine
The engine executes XML Validator locally in your browser with microsecond latency and zero server transmission.
Copy or Download Output
Copy the sanitized, formatted, or generated output directly to your clipboard or download it for your project.
Why Use XML Validator on ShortTrick
Engineered for maximum speed, strict privacy, and frictionless digital productivity.
Zero Code or Token Leaks
Proprietary source code, API keys, database queries, and tokens processed in XML Validator never leave your browser.
Microsecond Performance
Optimized AST parsers and Web Crypto APIs process large payloads in XML Validator in milliseconds.
No Paywall or Account
Built for developers to use XML Validator instantly without sign-up friction or rate limits.
Syntax Validation & Formatting
XML Validator highlights syntax errors and enforces standard formatting conventions automatically.
Offline Ready
Once loaded, XML Validator functions entirely offline without requiring an active internet connection.
Dark Mode Optimized
High-contrast typography designed for effortless reading during coding sessions.
Frequently Asked Questions About XML Validator
Common questions regarding XML Validator, data privacy, file format compatibility, and usage limits.
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