Best for : Cleaning API and config XML, validating SOAP/WSDL samples, exporting to JSON or tabular formats, testing XPath expressions, and spotting structural diffs between two XML documents.

Not for: Full XSD schema validation, XSLT transforms, or server-side pipelines at scale. Converters and code helpers are best-effort for common shapes.

1. Overview

XML Formatter & Converter is a free browser tool for reading, editing, validating, comparing, and converting XML. Paste markup, pretty-print or minify, run XPath, inspect namespaces, convert to JSON / CSV / TSV / YAML / string, compare two documents, browse a tree outline, then download the result. Core work runs on your device.

XML Formatter & Converter workspace overview — XML Formatter overview — editor, format / convert / compare modes

2. All features

Everything below is available in the same workspace — use the mode toggle (Format / Convert / Compare) and toolbar actions.

XML formatter / pretty print / validator
XML minify and one-line output
XML to JSON / JSON-LD / CSV / TSV / YAML conversion
Export TypeScript, C#, Java, JS, Python, and Lua helpers
XPath tester for node and scalar queries
Namespace inventory for prefix/URI auditing
SOAP and WSDL sample presets
Escape / unescape XML entities
Base64 encode / decode for XML payloads
URL encode / decode utilities
Strip XML comments
Sort XML attributes
XML tree view output
Side-by-side XML compare with diff view
Private browser-only processing

Prefer JSON workflows? Open JSON Formatter & Converter .

3. Workspace layout

The interface focuses on a few key parts:

Modes — Format, Convert, or Compare.
Editor — paste or edit input (XML A in Compare).
Output / XML B / Tree / Diff / XPath / Namespaces / Size — result tabs for text, outline, compare report, queries, and stats.
Actions — Format/Convert/Compare, Minify, Validate, utilities, Download.

4. Format, minify & validate

Use Format to pretty-print well-formed XML with your chosen indent. Use Minify for compact one-line output. Validate confirms the document parses and surfaces parser errors with line hints when available.

Fix unclosed tags, mismatched quotes, and entity issues first.
Format mode expects well-formed XML input.
See also XML formatter online , validate XML online , and minify XML online .

Pretty-printed XML after using Format in the XML formatter — Format — pretty-print XML and catch parser errors

5. Converters (JSON, CSV, TSV, YAML, string & code)

Open Convert, keep From as XML, pick a To format, then run Convert. Built-in converters include:

XML to JSON — structured object from the element tree.
XML to JSON-LD — context-friendly object export.
XML to CSV / TSV — tabular rows for spreadsheet-friendly shapes.
XML to YAML — indented YAML document.
XML to String — escaped string literal.

Extra outputs: TypeScript, C#, Java, JS, Python, and Lua helpers, plus reformatted XML and plain text. Longer walkthrough: convert XML to JSON and XML to YAML / CSV .

XML converter with JSON CSV TSV YAML and string outputs — Convert — XML to JSON, CSV, TSV, YAML, string, and more

6. XPath & namespaces

Open the XPath tab, enter an expression (for example //item/@sku or count(//customer/*)), and run it against your XML. Results appear as serialized nodes or scalar values.

The Namespaces tab lists declared prefixes and URIs with occurrence counts — useful for SOAP envelopes, WSDL, and namespaced config. Load SOAP or WSDL samples from the Samples menu to try these panels quickly. See XML XPath tester and SOAP / WSDL XML formatter .

XPath tester panel evaluating an expression against XML — XPath — evaluate expressions and inspect matching nodes

Namespace inventory listing XML prefixes and URIs — Namespaces — prefix and URI inventory for SOAP/WSDL docs

7. Compare, tree & unique extras

Compare mode places XML A on the left and XML B on the right. Run Compare to open the Diff tab with a path-level report of structural differences.

Use the Tree tab for a collapsible outline. Utility actions include Strip comments, Sort attributes, Escape / Unescape, Base64, and URL encode / decode. See also compare XML online .

XML compare mode with structural diff report — Compare — structural differences between two XML documents

XML tree outline viewer in the results panel — Tree — collapsible outline of elements and attributes

8. Import URL & download

Import URL fetches a public http(s) XML or text resource from your browser. The remote host must allow CORS; private or blocked APIs will fail in the browser for security reasons. Tools Viewer does not proxy or store that content on our servers.

After formatting or converting, use Download to save a file locally (XML or the selected output extension such as .json, .csv, .tsv, .yml, .ts, or .cs).

Import XML from URL control in the XML formatter — Import URL — fetch a public resource from your browser (CORS required)

9. Size calculator

The size panel reports characters, UTF-8 bytes, pretty vs minified size, element depth, attribute counts, comments, and CDATA sections for the current document. Use it to see how much space Minify saves before you ship a payload.

XML size calculator panel with byte and minify stats — Size panel — characters, UTF-8 bytes, pretty vs minified

10. Privacy

Formatting, validation, XPath, conversion, compare, and tree browsing run in your browser. No signup is required. Import from URL contacts the remote host from your browser subject to CORS — that fetch is not proxied through Tools Viewer servers.

XML Formatter Guide — Format & Convert Online