XML Editor Online — Free Browser-Based XML Editor

Edit XML documents in-place with live formatting, syntax highlighting, and instant well-formedness checks. Paste, modify, and reformat any XML — config files, SOAP envelopes, RSS feeds — entirely in your browser.

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XML Editor

Formatted Output

What is an Online XML Editor?

An online XML editor is a browser-based text editor that understands XML markup. You paste a document, edit elements, attributes, and text inline, and reformat with one click. Unlike an XML viewer (read-only) or a one-shot formatter (paste, format, copy), the editor is built around an iterative edit-fix-edit workflow — modify a value, hit Format, see the well-formedness verdict, fix any reported error, and continue.

The OpenFormatter XML editor runs entirely in your browser. There is no signup, no upload, and no rate limit — paste a 5 MB SOAP envelope or a 12-line RSS feed, and the same DOMParser the browser uses for fetched XML documents handles the parsing. That privacy guarantee matters when the document contains API keys, customer PII, internal hostnames, or any data your security policy forbids from leaving the device.

How to edit XML online — 4 steps

Paste your XML. Drop a config file, SOAP request, RSS feed, or any XML document into the Input panel above. Click Load Sample to start with a working catalog example.
Edit inline. Modify tag names, attribute values, or text content directly in the textarea. The browser's native undo stack (Ctrl+Z / Cmd+Z) is fully supported.
Click Format. Pick 2 spaces, 4 spaces, or tabs and hit Format. The editor parses your XML, reports a Valid badge, and renders the indented document on the right.
Fix errors and copy. An Error badge surfaces unclosed tags, malformed attributes, or stray characters with the exact parser reason. Fix and re-run, then click Copy to grab the result.

Sample input vs. formatted output

Input (one-line, hard to read)

<?xml version="1.0"?><catalog><book id="bk101"><title>XML Guide</title><price>44.95</price></book></catalog>

Output (indented, editable)

<?xml version="1.0" encoding="UTF-8"?>
<catalog>
  <book id="bk101">
    <title>XML Guide</title>
    <price>44.95</price>
  </book>
</catalog>

In-Place Editing

Modify elements, attributes, and text directly in the textarea. Native undo (Ctrl+Z) and redo (Ctrl+Y) keep the cursor where you expect, so the workflow feels like a desktop editor.

Live Formatting

Click Format to canonicalise indentation, collapse extra whitespace, and self-close empty elements. Every format pass also runs a well-formedness check against the browser DOMParser.

Client-Side Only

Your XML never leaves the device. The editor uses the browser's built-in DOMParser and runs zero network requests on Format — open DevTools and verify it yourself.

Common use cases

check_circleEditing XML configuration files (web.config, log4j.xml, application.xml) from any device with a browser
check_circleModifying SOAP request payloads for API testing without spinning up Postman or SoapUI
check_circleTweaking RSS, Atom, and sitemap.xml feeds before pushing to a CDN
check_circleAdjusting XSD schema definitions in the browser when you don't have a desktop XML IDE handy
check_circleEditing SVG markup as XML — useful for changing viewBox, paths, or namespaced attributes
check_circleModifying Maven pom.xml, Gradle settings.xml, or Spring bean definitions during code review
check_circlePatching XLIFF localisation files exported from translation systems
check_circleQuick fixes to XML test fixtures and snapshot files in CI pipelines

XML editor vs. viewer vs. formatter

An XML viewer renders a document as a collapsible tree for read-only inspection. An XML formatter performs a one-shot transform — paste, beautify, copy — without exposing an edit surface. The editor sits between them: a real textarea you can type in, with a Format button to canonicalise on demand. Reach for the editor when you need to change XML; reach for the viewer when you need to read it; reach for the formatter when you just want a one-pass clean-up of an existing document.

Need more than editing?

Validate, view, parse, or convert XML with the rest of OpenFormatter's XML toolkit — all browser-side.

XML Validator XML Viewer XML to JSON

Frequently Asked Questions

How is the editor different from an XML viewer?

A viewer is read-only — it renders XML as a collapsible tree for inspection but does not let you change anything. The editor is read-write: paste a document, modify tags, attributes, and text inline, then click Format to reflow the indentation. Use the viewer to explore an unfamiliar payload, use the editor when you need to change one and copy the result.

Does it offer real-time validation?

The editor performs well-formedness validation each time you click Format. Errors surface in the output panel with the exact reason the parser rejected the document — usually an unclosed tag, malformed attribute, or stray character. For continuous as-you-type validation, consider VS Code with the Red Hat XML extension; the in-browser editor is optimised for paste-and-fix workflows.

Can I undo edits?

Yes. The textarea uses the browser's native undo stack, so Ctrl+Z (Cmd+Z on macOS) reverses any keystroke. You can also click Clear to wipe both panels and start over, or Load Sample to populate a working catalog.xml example.

Will it auto-close tags?

Auto-close is not currently active in the textarea — you write the closing tag yourself, then hit Format to confirm well-formedness. This keeps the editor predictable for paste-from-clipboard workflows where the document is already complete and you only need to reformat it.

Does the editor support large XML files?

It comfortably handles documents up to several megabytes. Beyond that, browser textareas slow noticeably — for files over ~5 MB use a desktop editor like VS Code or IntelliJ. For typical config files, SOAP envelopes, or RSS feeds, the editor is responsive.

Is my XML uploaded to a server?

No. All editing, formatting, and parsing run as JavaScript in your browser using the native DOMParser. No network request is made when you click Format. Open DevTools → Network and confirm the panel stays empty — useful when you're editing XML containing API keys, customer PII, or proprietary configuration.

Can I edit XSD or WSDL with this tool?

Yes. XSD schemas and WSDL contracts are XML documents, so the editor accepts and formats them. For WSDL specifically there is a dedicated WSDL formatter that highlights service, binding, and portType blocks.

Why does my edit produce slightly different formatting than the source?

The formatter normalises whitespace: it collapses multiple blank lines, re-indents using your chosen width, and self-closes empty elements (<tag/> instead of <tag></tag>). The semantic content is identical — every parser produces the same DOM either way — but the byte-level output is canonicalised for readability.