XML Formatter Online
Turn a flat block of XML into clean, indented markup you can actually read — and find out at once whether it is well-formed — free in your browser, with no app and no upload. This xml formatter online beautifies your XML with proper nesting and flags any tag that does not parse.
Size
Nothing formatted yet.
Paste your XML, then press Format XML. Nothing is uploaded.
Validation checks well-formedness only, not against a schema or DTD.
Why Use This XML Formatter Online?
XML arrives in many shapes: sitemaps, RSS feeds, config files, API responses, and data exports. Much of it comes minified or generated, with no line breaks and no indentation, so reading it means counting angle brackets by eye. An xml formatter online puts every element on its own line and indents each level of nesting, so the structure of the document is visible at a glance and a misplaced tag is usually obvious.
The other half of the job is knowing whether the document is valid at all. XML is strict: one unclosed tag, one mismatched pair, or one stray character, and the whole document refuses to parse. A feed reader will not read it, a sitemap will not be accepted, and a config file will not load. This tool checks well-formedness as it formats, so you find out about the broken tag before you hand the file to anything else.
Privacy matters here too: this xml formatter online runs entirely in your browser, so your data never leaves your device — handy when the XML holds config details or records that are not yours to share. There is no account, no sign-in, and nothing to upload. It sits in our Developer Tools collection for every data job, from a quick sitemap check to a full feed rebuild.
How to Use This XML Formatter Online in 4 Steps
- Paste your XML. Copy your document into the input box in this xml formatter online — a whole file, or just the part you want to tidy.
- Press Format. The tool parses the document with the browser's own XML parser, then reprints it with two-space indentation at every level of nesting.
- Read the result. If the document is well-formed, the formatted XML appears at once. If it is not, the parser's error message tells you the line and column of the problem.
- Copy or download. Copy the formatted XML to paste into your editor, or download it as an .xml file.
XML Formatter Online: How Formatting Actually Works
Formatting starts with parsing. The browser's XML parser reads the document the same way any XML reader would: it checks that there is exactly one root element, that every opening tag has a matching closing tag, that tags nest in the right order, and that attribute values are quoted. If any of those rules fails, the parser stops and reports the error. This xml formatter online shows you that error, with its line and column, so the broken tag is easy to find.
Once the document parses, the formatter walks the tree node by node. Each element goes on its own line at the indent of its depth, with its attributes kept in place. An element that holds only text is printed on one line, so a short value such as a title or a price stays compact. Comments, CDATA sections, and processing instructions are kept as they are, because they carry meaning the formatter must not change. This xml formatter online follows those rules for the whole document, so a sitemap with hundreds of URLs comes out as a clean, readable list.
The XML declaration at the top, if there is one, is kept exactly as it was written, and the formatted output is plain text you can save anywhere. What the tool does not do is check your document against a schema or a DTD — that is a different job, and it needs the schema file as well as the document. For an introduction to the rules XML follows, see the MDN introduction to XML.
XML Formatter Online vs Other Ways to Read XML
| Method | Needs installing | Beautifies | Checks well-formed | Best for |
|---|---|---|---|---|
| This xml formatter online | No | Yes | Yes | A quick check in the browser |
| A code editor | Yes | Yes | With a plugin | Editing XML every day |
| An online formatter that uploads | No | Yes | Yes | Nothing — it uploads your data |
| Reading raw XML by eye | No | No | No | Tiny snippets only |
For a document you want readable right now, without installing anything or uploading your data, this xml formatter online is the simplest choice.
Everyday Scenarios for This XML Formatter Online
Reading a sitemap file with this xml formatter online
Your sitemap is generated as one long line, and you want to check that a new page is actually listed. Paste it in, format it, and every URL sits on its own indented line — you can search the list at a glance instead of scrolling sideways through a single line of markup.
Checking a config file before a deploy with an xml formatter online
You edited a config file by hand and the app now refuses to start. Format the file here: if the parser reports an error, it names the line and column, so you can fix the unclosed tag in seconds instead of reading the whole file tag by tag.
Cleaning up an RSS feed with this xml formatter online
A feed you subscribe to stopped updating, and you suspect the XML is broken. Paste the feed in and format it: a well-formedness error points straight at the bad item, and a clean format shows you the titles and dates in a readable list. Either way, this xml formatter online shows you what is wrong in seconds.
Common Mistakes When Using an XML Formatter Online
The biggest mistake is assuming that formatted XML is valid XML. Formatting only changes the whitespace — it does not add a missing closing tag, and it cannot fix a document that does not parse. If the tool reports an error, the document is broken, and no amount of formatting will make it readable to a feed reader or a sitemap crawler. An xml formatter online shows you the error; fixing it is still your job.
The second mistake is confusing well-formed with valid. A document can be perfectly well-formed — every tag balanced, every attribute quoted — and still be wrong for its purpose, because it is missing a required element or uses a value the receiving system does not accept. That check needs a schema or a DTD, which this tool does not do. The third mistake is pasting in a fragment with no root element: XML needs exactly one root, so a bare list of items will not parse until you wrap it.
XML Formatter Online: Frequently Asked Questions
No. This xml formatter online runs entirely in your browser. The XML you paste is used only on your own device and is never uploaded, stored, or sent to a server.
Well-formed means the XML follows the basic rules: one root element, every opening tag has a matching closing tag, tags nest properly, and attribute values are quoted. A well-formed document can be parsed; one that is not well-formed cannot be read at all.
No. Validation here checks well-formedness only — that the tags are balanced and the document parses. It does not check your XML against a schema, a DTD, or a set of required elements. For that, use a dedicated schema validator.
The tool shows the browser parser's error message, including the line and column where the problem is, so you can find the bad tag and fix it. Nothing is formatted until the document parses cleanly.
It contains the same formatted XML shown in the output box, saved as an .xml file, ready to upload to your site or open in an editor.
In short, this xml formatter online is the fast, private way to make any XML readable — paste it in, format it, and take the tidy document away.