WebTransport Echo Client - Online QUIC Test
Connect to a WebTransport server and exchange data over QUIC. See latency and throughput. Perfect for exploring low‑latency real‑time APIs.
UD5 Toolkit
Connect to a WebTransport server and exchange data over QUIC. See latency and throughput. Perfect for exploring low‑latency real‑time APIs.
Enter the characters you need and generate a smaller font file from a TTF/OTF. Keep only the glyphs you use. Using harfbuzz WASM.
Create a custom cookie consent banner with text, button styles, and colors. Copy the ready‑to‑use HTML/CSS/JS snippet.
Generate random truth questions and dares for game night. Categories for kids, teens, and adults. No repeats, all client-side fun.
Get endless 'Never Have I Ever' statements for your group. Clean and spicy modes. No installation, just pick up and play.
A tiny tool that hooks into the console and lets you export all messages to a file. Helpful for non‑technical bug reporting.
Create CSS clamp() values for fluid typography. Enter min and max font sizes and viewport widths. Modern responsive design.
Generate a CSS background that shows a baseline grid. Adjust line‑height and offset. Perfect for aligning text.
Calculate the probability of exactly k successes in n independent Bernoulli trials. Step-by-step result. Local.
Estimate how long it takes to download/upload a file given bandwidth speed. Also convert between bits and bytes.
Explore the contents of the Cache Storage API for your domain. See cached requests and their sizes. Debug offline apps.
A completely black page to save battery on OLED devices. Click to go fullscreen. Simple utility.
Load any variable font from Google Fonts or local file and play with weight, width, slant, and custom axes. Download CSS.
See the current state of a Service Worker for your page: installing, waiting, active. Unregister or skip waiting. Developer utility.
Enter air and snow temperature plus humidity to get the right glide wax color (Swix/Toko). Perfect kick and glide.
Click for a curated motivational quote from famous figures. Share on social media with a single tap. Uplifting.
Rate symptoms severity daily and add notes. Visual pain map. Export for doctor visit. Private local storage.
Check how many pages a PDF has without uploading it (uses FileReader). Also shows file size and title if available. Simple and fast client-side tool.
Fetch a page and list all loaded assets (CSS, JS, images) with their sizes. See total page weight. Quick performance check.
Build a conic gradient with any number of color stops. Visual editor. Ideal for creating pie charts or colorful spinners.
Simulate memory page reference strings with FIFO, LRU, and Optimal algorithms. See page fault count. OS concept demo.
Generate a random developer‑themed motivational (or demotivational) poster image using pure CSS. Fresh inspiration for your coffee break.
Place two containers side by side to see how inline‑flex differs from flex. Understand block vs inline formatting.
Choose where page breaks should occur for printing. Get the break‑before, break‑after, and break‑inside CSS.
Adjust speed and see how dynamic pressure changes. Visualize how a pitot tube measures airspeed. Aviation & physics demo.
Plan a party or event budget by category (venue, food, decorations). See total and cost per guest. Export summary.
Create circular and elliptical clip paths visually. Adjust radius and position. Copy the CSS. For avatars and masks.
Count total DOM nodes on the current page and show warnings if limits exceed best practices. Keep the DOM lean.
Paste a list of foreground/background color pairs and instantly see which pass AA/AAA. Perfect for checking entire style guides.
See how align‑items: baseline works in grid to align different font sizes on the same baseline. Visual guide.