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Check XML Files for Errors and Standards Compliance

Analyze XML documents, identify errors in the code, and verify compliance with standards. A handy tool for web development and integrations.

Original XML

or paste XML contentDo not enter personal or confidential data.

Paste an XSD schema below if you need it. For a DTD, put the rules in your main XML inside a DOCTYPE declaration — remote DTD files are not downloaded.

Result

Document statistics

Nesting depth
Line count
Document size
Error count

Formatted XML

Errors

No errors.

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Features of the "XML Validator"

Check XML Files for Errors

Analyzes the structure of XML documents and identifies syntax errors. Allows developers to quickly find and fix inaccuracies.

Support for sitemap.xml

Allows you to check the sitemap before submitting it to search engines. This helps avoid problems with page indexing.

Compliance with DTD and XSD Standards

Ensures that the XML document is correct and meets international requirements. This is especially important for APIs and integration with external services.

Guide & Usage Details

What the XML Validator Does

The XML Validator checks XML documents for structural correctness, syntax errors, and compliance with a specified schema.

The tool helps you:

  • find errors in XML files

  • verify document structure correctness

  • validate XML against an XSD schema

  • analyze sitemap.xml, RSS feeds, and other XML documents

  • format XML for easier viewing

Suitable for web development, SEO, integrations, APIs, data processing, and website administration.

What the Validator Checks

After validation, the tool displays:

Check

What Is Analyzed

XML Syntax

Correctness of the document structure

Tag Nesting

Proper opening and closing of elements

Required Characters

Special characters and escaping

XSD Compliance

Structure validation against a schema

Document Statistics

Number of elements and document structure

Formatted XML

Readable representation of the document

This helps identify errors quickly before publishing a document or sending data to other systems.

Most Common XML Errors

Error

Example

Unclosed Tag

<title>Example

Incorrect Nesting

<a><b></a></b>

Multiple Root Elements

<a></a><b></b>

Unescaped & Character

Tom & Jerry

XSD Schema Violation

Missing required element

XML is highly sensitive to syntax. Even a single unclosed tag can make the entire document invalid.

XML and XSD

When needed, a document can be validated not only for syntax but also for structural compliance.

XML

XSD

Contains data

Describes the data structure

Defines document elements

Defines validation rules

May be syntactically valid

Verifies structural business rules

Example of XML Validation Against an XSD Structure

XML

<?xml version="1.0" encoding="UTF-8"?>
<user>
    <name>Alex</name>
</user>

XSD

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://w3.org">
  <xs:element name="user">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="name" type="xs:string"/>
        <xs:element name="email" type="xs:string"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

In this case, the XML is syntactically correct but fails schema validation because the <email> element is missing.

Practical Recommendations

  • Validate XML before uploading it to third-party services.

  • Use XSD schemas for critical integrations.

  • Validate sitemap.xml files after generation.

  • Check special characters (&, <, >, ") carefully.

  • Use formatted XML to simplify debugging.

If XML is used in integrations or APIs, validate it before sending. Fixing errors during data preparation is usually much faster than troubleshooting issues after the document has already been transmitted.

Tool Description

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The XML validator allows you to check XML files for errors in structure and syntax. This is important for working with sitemaps (sitemap.xml), RSS feeds, API requests, and other XML documents used in web development.

The service automatically analyzes the code, identifies errors, and indicates their location. This simplifies the work of web developers, system administrators, and content managers, reducing the likelihood of errors on websites.

Our XML validator supports various XML standards. This makes it a universal tool for checking data before publishing it or integrating it into systems.

Frequently Asked Questions (FAQ)

XML validation checks if an XML document conforms to syntax rules and structure. Valid XML ensures data integrity, prevents parsing errors, and allows proper data exchange between systems.

Common errors include unclosed tags, mismatched opening/closing tags, invalid characters, missing required attributes, and incorrect document structure. Our validator identifies and explains these issues.

Well-formed XML adheres to basic syntax rules (correct tags, attributes, structure). Valid XML not only adheres to syntax but also conforms to a specific schema or DTD that defines allowed elements and structure.

Yes, XML can be validated against schemas (XSD) or DTDs that define structure, data types, and constraints. This ensures that the XML complies with specific business or technical requirements.

Fix errors by ensuring all tags are properly closed, attributes are quoted, special characters are escaped, and the document structure conforms to any required schema. Use our validator's error messages to guide corrections.

A DTD is an older way of defining the valid structure of an XML document, specifying elements, attributes, and their relationships. XML Schemas (XSD) are a more powerful and flexible alternative.

XSDs are more expressive, allow for richer data types, are written in XML (making them easier to integrate), and provide greater validation capability, making them the preferred choice for most modern applications.

Yes, the validator processes data only to check its structure and syntax. The XML document is not published or made accessible to other users. However, when working with sensitive data, we recommend adhering to your organization's internal security policies.

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