XML Validator
Paste XML and see live well-formedness checks with line and column errors. Parsing runs entirely in your browser — ideal before formatting configs or shipping feeds.
Developer notes
• Validation runs automatically after you pause typing (debounced) — no server round-trip.
• Parsing uses the browser DOMParser with text/xml — the message is the parser text.
• DTD or XSD hints in the file do not trigger schema validation on this page.
• Use Beautify XML to format; this route checks well-formedness only.
When teams pick this route
• Confirm feeds and config snippets parse before CI or deploy. • Debug copy-paste accidents with precise line numbers. • Quick check before prettifying with Beautify XML.
Related formatting tools
Format valid XML with Beautify XML, minify with Minify XML, or expand with Unminify XML.
XML validator FAQ
Well-formedness checking without leaving your browser
Does this beautify or minify XML?
No — this route validates well-formedness only. Use Beautify XML to indent documents or Minify XML to compress them.
Is XSD or DTD validation supported?
No — this page checks whether XML is well-formed. Schema validation is out of scope.
Is my XML uploaded?
Never — parsing and validation stay entirely inside your browser tab.
Does the encoding declaration change the verdict?
The tool judges the text you paste as Unicode in the editor. An encoding attribute alone does not flip a well-formed document to invalid.
Beautify
Make code readable with consistent indentation — beautify JavaScript, CSS, TypeScript, SCSS, LESS, Markdown, GraphQL, SQL, YAML and more in your browser.
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Minify
Shrink code and assets for production — minify JavaScript, CSS, HTML, JSON and XML before gzip or CDN deploy.
Unminify
Expand minified or compressed code — unminify JavaScript, CSS, TypeScript, SCSS, LESS, SQL, YAML and other formats when debugging or reviewing.
Conversion
Transform data between JSON, YAML, XML and CSV locally — no server uploads.
Encoding
Encode or decode Base64, URL components and HTML entities — client-side only.
Serialization
Serialize and deserialize PHP data structures beside JSON workflows.
JSON Tools
Validate, format, diff and explore JSON payloads — complementary to minifiers and converters.
SVG Tools
Preview, optimize with SVGO, export Data URI, resize, beautify, convert to JSX and validate SVG — all in your browser.
CSS preprocessors
Compile SCSS or LESS to standard CSS in the browser — pair with beautify or minify for a full stylesheet workflow.
Color & CSS Tools
Paste-local WCAG contrast checking with modern CSS color syntax — pair and matrix views, never uploaded.
DevOps & Infra
Terraform HCL format/validate/minify, Dockerfile format & lint, Docker Compose and .env validation.
CI/CD
GitHub Actions and GitLab CI — format YAML and check workflow/job structure in your browser.
Logs & observability
Line-oriented JSON/NDJSON and Nginx/Apache access logs — format, filter, validate, and CSV/TSV.
Kubernetes
Multi-doc manifests, structural validate, Ingress/Deployment starters, and Helm values formatting.
Networking / IP
CIDR, subnets, and IPv4/IPv6 helpers — in your browser.
Security & tokens
JWKS, X.509 certificates, and secrets scan — browser-local.
API & schemas
OpenAPI tools to format, validate, and lint your specs.
HTTP Tools
Paste-local cURL, HTTP messages, URLs, HAR files, and Cookie / Set-Cookie headers — format and inspect in your browser, never sent.
SEO / Web Tools
Generate meta tags, Open Graph, and Twitter Card output locally — previews simulated from your inputs, never fetched from your live site.
Developer utilities
Timestamps, UUID, ULID, Nanoid, cron, passwords, regex, slugify, number bases, case, text diff, and chmod — all client-side.
Text & Markdown
Count words, build Markdown TOCs, and clean line lists — all in your browser.
AI & LLM
Token counting, pricing estimates, and context-window fit — 100% browser-local.
Test Data
Synthetic field values for fixtures and DB seed — reserved-range phone numbers first.
Barcode labels
Draw Code 128, EAN-13, and UPC-A label images in the browser — PNG and SVG download, not a GS1 lookup.