Validate XML
Paste XML to check whether it is well formed, inspect its document structure, and save a readable result without uploading your data.
A QUICK WALKTHROUGH
How to use this tool
- Paste one XML document up to 200,000 characters.
- Select Validate XML to inspect syntax, the root element, and document metrics.
- Copy or download the formatted XML when the document is valid.
Parser diagnostics in your browser
Invalid XML is rejected before a result is generated. The page reports the browser parser message and line or column when available, including malformed tags, attributes, entities, and trailing content.
Useful structure summary
Valid documents show the root element, total element and attribute counts, text character count, and UTF-16 character and byte sizes. Comments and processing instructions are accepted XML nodes but are not counted as elements.
Local and bounded
The browser parses and formats the document on your device. Inputs are limited to 200,000 UTF-16 characters; nothing is uploaded or resolved from an external URL.
GOOD TO KNOW
Common questions
What does XML validation check?
It checks that the complete input is one well-formed XML document with correctly nested elements, quoted attributes, valid markup, and no unexpected trailing content.
Is my XML uploaded?
No. Parsing, summary generation, formatting, copying, and download preparation happen locally in your browser.
Are external entities or URLs fetched?
No. The browser parser is used only to inspect the pasted string, and this page does not fetch external resources.
Can I save the validated document?
Yes. After validation, copy the formatted XML or download it as a .xml file.