Flexbox Playground - Online CSS Flex Layout Generator
Visually experiment with Flexbox container and item properties. See the layout update in real time and copy the CSS. Learn by doing, fully interactive.
UD5 Toolkit
Scaffold reusable React hooks with useState in seconds. Choose state types, auto‑generate handlers like increment, toggle, reset, and copy clean code.
use and which can call other React hooks. It allows you to extract and reuse stateful logic across multiple components..js file inside a React project (e.g., useCounter.js). It imports only React hooks, so no extra dependencies are needed.Visually experiment with Flexbox container and item properties. See the layout update in real time and copy the CSS. Learn by doing, fully interactive.
Enter spring constant and displacement to find force and stored energy. Visual compression.
Create a simple 4-shaft weaving draft by clicking warp/weft threads. See plain weave, twill, satin. Educational for weavers. Local only.
Build a .editorconfig file by setting indentation, charset, and end‑of‑line rules for your project. Keep all contributors aligned.
Fill in your details and instantly get a clean, printable one-page resume. No sign up, no data leaves your browser.
Visually configure scroll‑snap containers and items. Adjust alignment, stop behavior, and padding. Copy the clean CSS instantly.
Follow along with animated crease patterns to fold a paper crane. Pause and rewind steps.
Fill in a form to generate a clean, ATS‑friendly one‑page resume. Customize sections, colors, and export as print‑ready PDF. Personal data stays in your browser.
Create a 'SALE' or 'NEW' corner ribbon in pure CSS. Adjust colors, position, and text. Great for e‑commerce.
Generate Lorem Ipsum placeholder text for your designs and mockups. Specify paragraphs, words, or bytes. Produce classic or custom dummy content instantly.
Set up a Shared Worker that shares state across multiple browser tabs. Counter and messaging demo. Advanced web.
Enter container width, number of items, gap, and flex‑basis. See the resulting sizes instantly. Plan your flex layout.
Set width, height, depth, and colors to generate an isometric box using CSS transforms. Copy to your project.
Design a tooltip that appears on hover without JavaScript. Choose positioning, arrow, and animation. Copy the clean HTML/CSS.
Generate the Koch snowflake fractal to a desired iteration level. See how the perimeter grows. Interactive geometric art.
Select character sets (Latin, Cyrillic, Greek) and generate the exact unicode‑range descriptor for your fonts. Improve performance.
Enter an amount and see a virtual stack of $100 bills with height comparison to everyday objects.
Create outlined text with the text‑stroke property. Adjust width and color. Preview and copy the CSS.
Convert TOML configuration files to equivalent YAML with perfect structure preservation. Fast and local.
Define password rules and see a live checklist that updates as you type. Design better password UX for your app.
Convert torque units between Newton-meter, foot-pound, inch-pound, and more. Essential for mechanics and engineers. Instant local conversion.
Enter dependencies in a simple text format and see a force‑directed graph of the project's dependency tree. For planning architectures.
Generate standard 1D barcodes including CODE128, EAN-13, and UPC-A. Download as image for product labeling or inventory. All processing happens locally.
Paste code and generate a beautiful, syntax‑highlighted PNG image. Choose theme and window style. Shareable code pics.
Create beautiful, syntax-highlighted screenshots of your code snippets. Choose themes and export as PNG. All client-side canvas rendering.
Create colorful digital sticky notes on a corkboard. Drag, edit, and delete. Notes persist in local storage. No login.
Visually design a custom :focus‑visible outline style. Copy the CSS. Better than the default.
Project your retirement savings growth with monthly contributions, employer match, and CAGR. Interactive chart. Financial data stays on your device.
Paste HTML/CSS snippets or enter properties to test how z‑index and stacking contexts interact. Real‑time example.
Generate a random HTML/CSS card with different box model properties. Inspect and guess the size. For learners.