Venn Diagram Builder - Online 2‑ & 3‑Set Overlap Visualizer
Create simple 2‑ or 3‑set Venn diagrams by entering comma‑separated lists. Shareable via URL fragment. No account.
UD5 Toolkit
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Create simple 2‑ or 3‑set Venn diagrams by entering comma‑separated lists. Shareable via URL fragment. No account.
Type JavaScript expressions and see output like a real browser console. Supports console.log, error, warn. Use for quick testing without DevTools.
Add player names and tap +/- to track scores. Custom starting points. Works for any game.
Enter frame size and image size to calculate mat borders. Visual preview. Precise framing.
Test overscroll‑behavior: contain to prevent background scroll or pull‑to‑refresh. See the effect in a live demo.
Play the classic Snake game inside your browser. Arrow keys to move, eat the apple, grow longer. High score tracked locally.
A big button that triggers a colourful confetti cannon full‑screen. Use it to celebrate small wins. Pure joy.
A visual guide to common copy‑editing and proofreading symbols. Click a mark to see its meaning. For writers.
Enter L*a*b* values and see the corresponding RGB and hex color. Useful for advanced color manipulation.
Convert numbers to Roman numerals and decode Roman numerals back to numbers. Supports up to large values. A fun educational tool running entirely in your browser.
Write a JavaScript snippet and get a ready‑to‑drag bookmarklet link. With minification and encoding. Easy browser tools.
Design a fully styled scrollbar with colors, width, and border radius. Get the CSS for Chrome and Firefox.
Find equivalent colors across DMC, Anchor, and Madeira embroidery floss brands. Enter a code to see matches. Local reference database.
Explore the new two‑value display syntax like `display: block flex`. See what each inner/outer pair does visually.
Paste long text and split it into 2, 3, or 4 balanced CSS columns. Preview and copy HTML/CSS. For magazine layouts.
Make your JavaScript code more readable with this online beautifier. Format and indent JS automatically. Works entirely in your browser, protecting your code privacy.
Load a video file and grab any frame as a still image. Navigate frame by frame. Download the snapshot. All done on your device.
Animate elements as they enter and exit the viewport using view() timeline. Parallax and reveal effects without JS.
Define min and max font sizes and viewport widths. Generate a complete fluid type scale using CSS clamp() for all headings.
Select your racquet head size, string type, and play style to get a recommended tension range. Find your sweet spot.
Convert any integer up to 3999 into its Roman numeral representation and vice versa. Quick and accurate. Local.
Design a pure CSS tooltip with custom text, position (top/bottom/left/right), and arrow. Copy the clean code.
Write expressions with clamp(), min(), max(), abs(), sign(), round() and see the computed value. Modern CSS calculations.
Calculate resistor values for transistor fixed bias or voltage divider configuration. Quick quiescent point analysis.
Calculate tips and split bills easily. Adjust tip percentage and number of people. Perfect for dining out. All computations happen on your device.
Test the new HTML popover attribute for creating accessible tooltips, menus, and dialogs without JavaScript. Copy code snippets.
Paste any JavaScript snippet and get a ready‑to‑drag bookmarklet link. Minify and encode automatically. Pure client.
Generate a horizontal Code‑128 barcode from any string. Download as PNG or SVG. Works offline. For inventory.
Write a message and set a future date. It will be hidden until that day. All stored locally with countdown.
Set a short timer with a themed emoji animation (e.g., pizza cooking). A playful visual countdown.