TOML vs XML: Which Should You Use?

Side-by-side comparison of TOML and XML data formats — features, pros, cons, and conversion options.

Quick Answer

TOML is best for Application configuration files (Cargo.toml, pyproject.toml). XML is best for Enterprise data exchange, SOAP APIs, and document markup.

Quick Verdict

TOML Best for Application configuration files (Cargo.toml, pyproject.toml)

✓ Explicit typing prevents YAML-style coercion bugs
✓ Clean table syntax for config sections
✓ Easy to read and write by hand
✗ Deeply nested structures become awkward

Convert TOML to XML →

XML Best for Enterprise data exchange, SOAP APIs, and document markup

✓ Mature schema validation with XSD and DTD
✓ Rich ecosystem of tools (XPath, XSLT)
✓ Self-describing with namespaces
✗ Extremely verbose compared to JSON/YAML

Convert XML to TOML →

Specs Comparison

Side-by-side technical comparison of TOML and XML

Feature	TOML	XML
Category	Data	Data
Year Introduced	2013	1998
MIME Type	application/toml	application/xml
Extensions	.toml	.xml
Plain Text	✓	✓
Typed	✓	✗
Nested	✓	✓
Human Readable	✓	✓
Schema Support	✗	✓
Streaming	✗	✓
Binary Efficient	✗	✗

Pros & Cons

TOML

Pros

✓ Explicit typing prevents YAML-style coercion bugs
✓ Clean table syntax for config sections
✓ Easy to read and write by hand

Cons

✗ Deeply nested structures become awkward
✗ Smaller ecosystem than JSON or YAML
✗ No multi-line inline tables

XML

Pros

✓ Mature schema validation with XSD and DTD
✓ Rich ecosystem of tools (XPath, XSLT)
✓ Self-describing with namespaces

Cons

✗ Extremely verbose compared to JSON/YAML
✗ Complex parsing requirements
✗ Falling out of favor for new APIs

When to Use Each

Choose TOML when...

You need files optimized for Application configuration files (Cargo.toml, pyproject.toml)
Explicit typing prevents YAML-style coercion bugs
Clean table syntax for config sections

Choose XML when...

You need files optimized for Enterprise data exchange, SOAP APIs, and document markup
Mature schema validation with XSD and DTD
Rich ecosystem of tools (XPath, XSLT)

How to Convert

Convert between TOML and XML for free on ChangeThisFile

Convert TOML to XML Runs in your browser — files never leave your device Convert XML to TOML Runs in your browser — files never leave your device

Frequently Asked Questions

What's the difference between TOML and XML?

TOML is best for Application configuration files (Cargo.toml, pyproject.toml), while XML is best for Enterprise data exchange, SOAP APIs, and document markup. Both are data formats but they differ in compression, compatibility, and intended use cases.

Is TOML or XML better for data?

It depends on your use case. TOML is better for Application configuration files (Cargo.toml, pyproject.toml). XML is better for Enterprise data exchange, SOAP APIs, and document markup. Consider your specific requirements when choosing between them.

How do I convert TOML to XML?

Go to the TOML to XML converter on ChangeThisFile. The conversion runs entirely in your browser — your file never leaves your device. It's free with no signup required.

Can I convert XML to TOML?

Yes. ChangeThisFile supports XML to TOML conversion. The conversion runs in your browser with no upload required.

Which is smaller, TOML or XML?

File size varies depending on the content, compression method, and quality settings of each format. In general, lossy formats produce smaller files than lossless ones. Test with your specific files to compare actual sizes.

Does TOML support typed?

Yes, TOML supports typed, but XML does not. This may be important depending on your use case.

Is TOML or XML free to use?

Both TOML and XML are supported file formats that are free to use. You can convert between them for free on ChangeThisFile — browser-based conversions have no limits and your files never leave your device.

Which format is newer, TOML or XML?

TOML is newer — it was introduced in 2013, while XML dates back to 1998. Newer formats often offer better compression and features, but older formats tend to have wider compatibility.