HTML Headings Outline Generator - Online From Webpage
Enter a URL and see a nested list of all headings (h1‑h6). Check your document structure for SEO and accessibility. Pure fetch.
UD5 Toolkit
Instantly generate ready-to-use Playwright test boilerplate. Choose your language, template, and preferences — get clean, production-ready spec files in seconds.
npm init playwright@latest. Then save the generated .spec.ts (or .spec.js) file into your project's test directory. Run it with: npx playwright test path/to/your-test.spec.ts. For headed mode (seeing the browser), use npx playwright test --headed. You can also run a single test with -g "test name" flag.
mcr.microsoft.com/playwright) makes this straightforward. Enable trace recording for better debugging of CI failures.
Enter a URL and see a nested list of all headings (h1‑h6). Check your document structure for SEO and accessibility. Pure fetch.
Create a breadcrumb schema for your website. Fill in the pages and get the ready‑to‑paste JSON‑LD snippet for rich results.
Simulate different cache strategies (Cache First, Network First, Stale‑While‑Revalidate) and see responses. Learn offline patterns.
Use SSML <mark> tags to fire events during TTS. See text highlighted as it is spoken. Understand speech synthesis timing. local.
Lay down a beat on a grid sequencer for kick, snare, and hi-hat. Play, loop, and adjust tempo. All sound via Web Audio API.
Enjoy classic Tetris in your browser. Rotate, move, and drop tetrominoes. Clear lines and score. Fully local JavaScript.
Answer questions and see typical milestones for 0-5 years. Educational reference for parents. Not a diagnostic tool.
Paste an URL or HTML and see the h1‑h6 hierarchy as a tree. Detect skipped levels and improve accessibility. Client‑side.
Play the classic Connect Four in your browser against a friend or CPU. Drop discs to get four in a row. Clean SVG board, local logic.
Generate a CSS background that shows a baseline grid. Adjust line‑height and offset. Perfect for aligning text.
Practice aligning grid items and tracks with the place‑items, align‑content, and justify‑content properties. Visual guide.
Scroll a container and see how sticky elements behave. Adjust top, bottom, and scroll margins. Copy the code.
Place multiple grid items into the same cells to create overlapping layouts. Learn the technique visually. Copy code.
See how align‑items: baseline works in grid to align different font sizes on the same baseline. Visual guide.
Practice CSS selectors by targeting plates on a virtual restaurant table. 30+ levels. Perfect for beginners.
Paste CSV and get a beautiful HTML table with sortable headers (optional). Copy the full HTML/CSS snippet. Local.
Randomly generated subnetting questions. Calculate network address, broadcast, and usable range. For CCNA prep.
Register a one‑off background sync and see it fire when connectivity returns. Debug service worker sync logic.
Paste an SVG path d string and parse it into an array of commands and coordinates. Useful for animations.
Keep track of stitches and rows for your knitting projects. Multiple counters with increase/decrease shortcuts. Data saved in your browser.
Encode or decode data to/from Base58 (Bitcoin alphabet). Useful for cryptocurrency address generation testing. Fully local, no data sent.
Create colorful digital sticky notes on a corkboard. Drag, edit, and delete. Notes persist in local storage. No login.
Structure your episode with timed segments. Includes call to action notes. Export as text.
Paste CSV and get a list of SQL INSERT statements. Define table name and column mapping. All local conversion.
Enter a domain and see public WHOIS info via a free API with rate limiting. Quick domain check.
Searchable table of well‑known TCP and UDP ports with their services. Check 80, 443, 3306, and many more.
Convert a simple black and white image into an SVG path using edge detection. Extract vector outlines. Local canvas processing.
Paste a SQL CREATE TABLE statement and extract just the column names as a CSV header row. For data migration.
Start/stop timer per project to log hours. See daily and weekly totals. Data stays in localStorage. Export summary as CSV. No account needed.
Test the modern File System Access API. Open a file, modify it, and save back to disk. All sandboxed in browser.