19 free toolsno accountnothing stored
Validate XML.
Find the fix.
Validate, format, convert, and compare XML. Look up parser errors with broken examples and their fixes, or explore 322 reference entries.
Up to 2 MB per document. Processed on our server; document contents are not stored by the tools.
<channel><item><title>First</title></channel>
Opening and ending tag mismatch: item line 2 and channel (line 4)
- Xerces (Java)
- The element type "item" must be terminated by the matching end-tag "</item>".
- expat (Python)
- mismatched tag: line 4, column 2
The toolbox
19 free tools. No account required.
Paste a document, get an answer. Each tool parses in memory on the server and returns a result — no document, fragment, or filename is written to a database or a log.
Validate
Is this document acceptable — and if not, where exactly.
Convert
Move between XML and the shapes the rest of the stack speaks.
Inspect & clean
Read the structure, compare two versions, normalise the text.
The reference
A tool tells you it failed. This tells you why.
Browse parser messages, schema rules, namespaces, and formats. Error entries include a failing document, the cause, and a corrected example.
- 58
Glossary
The words the specs assume you know
- 24
Formats
Root element, namespaces, what breaks
- 49
Elements
Per-element rules, broken and fixed
- 33
Namespaces
URIs and their conventional prefixes
- 40
XPath 1.0
Functions, axes and operators that ran
- 39
XSD datatypes
What validates, and what only looks like it
- 29
Parse errors
Keyed by the message you were given
- 10
Schema errors
The ones only validation surfaces
- 31
Public endpoints
Real XML, re-fetched daily
- 9
Comparisons
XML or JSON, RSS or Atom, XSD or RNG
Practical guides
From the error message to the working document.
Focused walkthroughs for parser failures, feeds, sitemap incidents, namespace-aware XPath, XSD contracts, and SOAP faults.
- 6 min
XML
How to fix an invalid XML entity reference
Find the unescaped ampersand, distinguish named entities from character references, and repair the value without hiding malformed input.
- 7 min
Sitemaps
How to fix “Sitemap could not be read”
A deterministic checklist for separating fetch failures, HTTP problems, malformed XML, namespace mistakes, and invalid sitemap entries.
- 8 min
Languages
Validate XML in JavaScript and TypeScript
Build a layered JavaScript validation path that separates XML syntax, namespace and vocabulary diagnostics, XSD validation, and application rules.
- 12 min
Security
Prevent SAML XML signature wrapping
Validate SAML structure, signatures, destination, audience, time, request correlation, and replay without consuming an unsigned sibling assertion.
- 7 min
XSLT
Make XSLT match a default namespace
Fix XSLT templates that never fire when source elements use a default namespace, with patterns that work across XSLT versions.
- 9 min
Integrations
Validate XML in GitHub Actions with SARIF
Call the XMLDir validation API from a workflow, preserve filenames, fail the job on errors, and upload SARIF for pull-request annotations.
In practice
Feeds, sitemaps, and integrations.
Sitemap operations
Track sitemap freshness, broken URL patterns, missing lastmod values, oversized files, and indexability regressions.
Keep sitemap.xml healthy at scaleVendor integrations
Map the payloads partners actually send and catch contract drift before it breaks orders, claims, listings, or reports.
Catch contract drift before it breaks ordersXML to data workflows
Extract repeatable XPath maps and prepare XML for JSON, CSV, SQL, warehouse, or Postgres ingestion, with field mappings that survive upstream schema changes.
Turn XML into clean, repeatable pipelinesSample payload vault
Keep redacted examples, test fixtures, validation notes, and known quirks in a workspace teams can search, instead of in one person's inbox.
A searchable memory for tricky XML
The workspace
Keep versions. Track what changes.
Save documents in a free workspace to search their structure, compare versions, and re-check monitored URLs on a schedule.
No card. The guest workspace needs no account at all.
Search the structure
Find paths, attributes, sample values, and schema references in each document.
Compare versions
See which elements, attributes, and values changed between saved versions.
Monitor sources
Re-check feeds, sitemaps, and partner URLs for errors and structural changes.