XML Formatter & Validator - Free Online XML Beautifier
Easily format, validate, and beautify XML documents. Minify XML data with a single click. All processing happens locally in your browser for maximum privacy.
UD5 Toolkit
Validate JSON-LD, Microdata & preview Rich Results in real time.
Select an item to view its properties.
Preview appears here for supported types.
Easily format, validate, and beautify XML documents. Minify XML data with a single click. All processing happens locally in your browser for maximum privacy.
Paste prose and reformat so that each sentence starts on a new line. Helps with version control diffs.
Add, remove, push, pop items and watch the data structure change visually. Supports arrays, stacks, and queues. For CS students.
Type a simple sentence and see a rudimentary Reed‑Kellogg diagram. Educational.
Identify common grammar mistakes (subject-verb agreement, tense, articles) with simple rule-based analysis. Explanations provided. Not AI, purely rule-based and local.
Query a domain's DNS record against multiple public resolvers (Google, Cloudflare) and see how it propagates. Client‑side fetch.
See how a full paragraph looks with your chosen text and background colors. Not just a ratio; the real appearance.
Enter two names and get a whimsical compatibility score based on vowels, length, etc. Just for fun.
Create or solve logic grid puzzles (like Einstein's riddle). Enter clues and mark the grid. Practice logical deduction. Local only.
Check English spelling and get suggestions using the browser's built-in dictionary. Highlight errors instantly. No data leaves your machine.
Fill in a form and see the FormData object as JSON. Perfect for debugging multipart form submissions. Client-side.
Type a simple sentence and get guided prompts to add who, what, where, when, why. Build richer sentences.
Interpret your blood pressure reading based on American Heart Association and European Society of Cardiology categories. Visual gauge with actionable health insights.
See how WeakMap and WeakSet work. Add objects as keys and watch references. Understand memory‑efficient collections.
Search for any file extension to see its full name, MIME type, and description. Covers thousands of entries. Static data.
Adjust page characteristics (image size, server delay, layout shift) and see the simulated Core Web Vitals scores. Understand what impacts performance.
Enter a URL and get a quick simulation of First Contentful Paint, LCP, and CLS using browser metrics. Lightweight alternative.
Understand how !important behaves inside @layer vs unlayered styles. Interactive example. Avoid common pitfalls.
Create categorized shopping lists (produce, dairy, meat, etc.). Add items, check them off, and print. Data stored in your browser. Never lose a list.
Create a CAA DNS record to specify which certificate authorities can issue SSL certs for your domain. Prevent mis‑issuance.
Paste plain text and turn it into a nested outline using indent levels or Markdown headings. Great for planning.
Convert nested JSON translation files into a flat CSV table for translators. Also reverse back. Local only.
Type a word and see an animated semaphore figure spelling it out. Also enter flag positions to decode. Scouts and maritime fun.
Enter a regular expression and see a visual railroad diagram explaining the pattern. Learn and debug regex.
Paste two texts and see cosine and Jaccard similarity scores. Understand how close two documents are. All local math.
Enter a simple regular expression and see its equivalent Deterministic Finite Automaton diagram. Learn how regex engines work.
Upload multiple text files and concatenate them into one, with optional separators. No upload; processed instantly.
Estimate a child's potential adult height using the mid-parental height formula (adjusted for gender). Educational tool, not a medical prediction.
Enter terms and definitions and generate a clean `<dl>` HTML snippet. Great for glossaries and FAQs.
Patch the PerformanceObserver and show your page’s Core Web Vitals as you browse. See real‑time scores and suggestions.