Free XML test files and sample generator
Verbose, self-describing markup for hierarchical data. Common in legacy systems and config files.
What is a .xml file?
XML: Extensible Markup Language. XML remains the backbone of enterprise integration, SOAP services, and document formats like Office and ODF. Its strictness is a feature for testing: a well-formedness error is unambiguous, so parser behavior is easy to assert.
Why generate a test XML file?
- Test a parser or XSLT transform against a large, deeply nested document.
- Confirm malformed XML is rejected rather than partially processed.
- Exercise schema validation in an integration pipeline.
What you can put inside a .xml file
You get 5 content options for XML, so the file holds something meaningful rather than random padding: Key–value object, Array of records, Nested structure, Numeric dataset, Mixed data types. Pick several and they are merged into one file, with a section, sheet, slide or folder for each.
How a .xml file is identified
A .xml file has no signature at the start. A text format has no identifying leading bytes, so the extension and the reported media type are the only claims about it until a parser actually reads it, which is why validating uploads by extension alone is unsafe.
How the size lands on the exact byte
XML permits whitespace after the root element, so the padding goes there. The document still parses, and the tree is unchanged.
Negative testing with broken XML files
- Invalid. Identifiable, but wrong inside, so it fails during parsing.
- Corrupted. The leading bytes are destroyed. Same length as the valid file.
- Incomplete. Truncated part-way, so it is genuinely shorter.
- Empty. Chosen under Content rather than File Condition: valid structure, no data.
Which failure to reach for, and what to assert for each, is covered in how to make a corrupted file for testing. For upload limits and type checks see testing file upload validation, and for this format's encodings, UTF-16 and BOM test files.
Sample XML content
<user> <id>1</id> <name>Test User</name> </user>
This shows the shape of the file. Your download is generated fresh at the size you choose, so the values will differ.
How to open and verify the file
Validate with `xmllint --noout file.xml`, or open in a browser.
Media type application/xml · extension .xml · category Data
Generate a .xml file → · questions about sizes, privacy or cost are answered on the site FAQ.
Frequently asked questions about XML files
What identifies a .xml file?
Nothing at the start of the file does. A text format has no identifying leading bytes, so the extension and the reported media type are the only claims about it until a parser actually reads it, which is why validating uploads by extension alone is unsafe.
How can a .xml file be an exact number of bytes?
XML permits whitespace after the root element, so the padding goes there. The document still parses, and the tree is unchanged.
What can go inside the XML file?
There are 5 content options for .xml: Key–value object, Array of records, Nested structure, Numeric dataset, Mixed data types. Choose more than one and they are combined into a single file, a section, sheet, slide or folder per option, rather than downloaded separately.
Can I download several broken XML files at once?
Yes, select more than one File Condition and you get one ZIP containing a .xml per condition, each named after its condition.
Can the XML file use UTF-16 or a byte-order mark?
Yes. .xml is a text format, so it can be generated as UTF-8, UTF-8 with a byte-order mark, UTF-16 LE or UTF-16 BE. The body is shortened before re-encoding so the finished file still lands on the exact size you asked for. Note that a UTF-16 file always has an even byte count.
How do I open or verify the XML file?
Validate with xmllint --noout file.xml, or open in a browser.