Why this matters
XML remains the backbone of countless enterprise systems, configuration files, API payloads, and document formats like SVG and EPUB. When XML comes from a minified API response or a generated feed, it is often a single compressed line that is impossible to read or debug. Trying to find a mismatched tag or a missing attribute in unformatted XML wastes significant developer time, especially when the file spans hundreds of lines once expanded.
A proper XML formatter tokenizes the input into a tree structure, preserving every element, attribute, CDATA section, processing instruction, and comment. It then re-serializes the tree with consistent indentation, making the structure immediately visible. This is not a simple regex-replace approach that can break on edge cases. The tokenizer handles self-closing tags, escaped characters, and mixed content correctly, so the output is structurally identical to the input with only the whitespace changed.
On the other end, minification strips all unnecessary whitespace to produce the smallest possible XML payload. This matters for API responses where every kilobyte of bandwidth adds latency, and for configuration files where compact storage reduces repository size. The tool supports both directions with a single paste-and-click workflow, and the indent can be set to two spaces, four spaces, or tabs to match your project conventions.
Reference table
| Feature | Detail |
|---|---|
| Beautify | Expands minified XML into indented, readable markup |
| Minify | Removes all unnecessary whitespace for compact output |
| Indent options | 2 spaces, 4 spaces, or tab characters |
| CDATA | Detected, preserved, and reproduced verbatim in output |
| Comments | Kept in the token tree and included in formatted output |
How to use it
Paste your XML content into the input box.
Select your preferred indent style: two spaces, four spaces, or tab.
Click Beautify to expand the XML into indented markup, or click Minify to compress it.
Copy the formatted or minified output from the result area and use it in your project.
Testing your result
After beautifying, open the output in a code editor with XML syntax highlighting and confirm that the nesting structure matches your expectations. Verify that CDATA sections appear exactly as they did in the input, since these must not be modified during formatting. Check that comments are preserved in their correct positions within the tree. For minified output, validate that it parses correctly using an XML validator or by loading it into your application and confirming no parsing errors occur.
Common mistakes
Pasting HTML into the formatter and expecting XML-specific features like CDATA handling to work correctly.
Assuming the tool validates against a DTD or schema, when it only handles structural formatting.
Forgetting that elements containing only text are inlined on a single line, while mixed content spans multiple lines.
Not selecting the correct indent style before formatting, which then requires reformatting to match your project standard.
Edge cases and options
Mixed content, where an element contains both text nodes and child elements, is formatted across multiple lines with proper indentation for each child element. Elements that contain only text are kept on a single line for compactness. Processing instructions and comments are tokenized separately from element nodes, so they maintain their position in the document tree even after reformatting. The tool catches structural errors like unterminated tags, but it does not validate semantic correctness against a DTD or XSD schema. For full validation, use a dedicated XML schema validator after formatting.
Real-world use cases
Formatting a compressed API response in XML so you can read and debug the payload structure.
Minifying an SVG file to reduce its file size before embedding it in a web page.
Cleaning up an auto-generated XML configuration file with consistent indentation for a code review.
Preparing a nicely formatted XML document as a sample for documentation or a tutorial.
Frequently asked questions
Q: Does it validate XML?
A: It tokenizes and rebuilds the tree, catching unterminated tags and bad characters, but it does not validate against a DTD or schema.
Q: Are CDATA and comments preserved?
A: Yes, both are detected, kept in the tree, and reproduced verbatim in the output.
Q: What about mixed content?
A: Elements containing only text are inlined on a single line, while mixed content with text and child elements is indented across multiple lines.
Q: Can I choose the indent style?
A: Yes, you can select from two spaces, four spaces, or tabs before clicking Beautify to match your project conventions.
Q: What is the difference between this and a JSON formatter?
A: XML has unique structures like CDATA sections, processing instructions, attributes, and self-closing tags that require a dedicated XML tokenizer. A JSON formatter cannot handle these correctly.
Start using it now
Try the XML Formatter & Minifier tool. See also HTML Entities Encode / Decode and Code Formatter and JSON Formatter.
