Browser Feature Support Detector - Online Check Your Device
See a comprehensive table of which modern web APIs your current browser supports. Includes WebGPU, AVIF, and more.
UD5 Toolkit
Paste your HTML, and instantly compare original vs. minified code. See how many bytes you save in real‑time.
<pre>, <textarea>, <script>, and <style> tags. It safely removes comments and unnecessary whitespace.<pre>, <textarea>, <script>, and <style>. White space inside those tags is kept exactly as provided. All other unnecessary spaces and comments are safely removed.
See a comprehensive table of which modern web APIs your current browser supports. Includes WebGPU, AVIF, and more.
Enter a URL and generate a responsive iframe embed code with correct aspect ratio. Supports YouTube, maps, and more.
Count total DOM nodes on the current page and show warnings if limits exceed best practices. Keep the DOM lean.
Drag a virtual ruler across your screen to measure pixel distances. Horizontal and vertical guides. Useful for UI designers checking alignment.
Tune your guitar using the browser microphone. Detects pitch and shows deviation from standard tuning. No installation, pure client-side audio processing.
Create a reflection effect for images or text using box‑reflect. Adjust direction and offset. Copy the CSS.
Record your screen, window, or tab with audio directly in the browser. Download as WebM. No extension required.
Record your screen, window, or tab with audio directly in the browser. Download the recording as a WebM file. No upload.
Paste robots.txt content and parse it to check validity, find disallowed paths. Educational SEO tool. Local processing.
See your website inside iframes at multiple breakpoints simultaneously. Side‑by‑side responsive testing.
Combine TTS with text highlighting. See each word colored as it is spoken. For e‑learning content creation. Local.
Compare :focus and :focus‑visible styling. See which one applies when using mouse vs. keyboard. Accessible focus management.
Convert pixel values to em and rem units based on a base font size. Bidirectional. Must‑have for front‑end developers.
Test your browser's built‑in speech recognition. Speak and see the transcribed text appear live. Must‑have for voice app devs.
Paste a robots.txt file and validate its syntax. See if a specific user‑agent can access a path. Essential for webmasters.
Generate a Lit Element web component skeleton with styles and properties. Copy and start coding immediately.
Create a custom element with named slots and see content projection in action. Learn Web Components basics.
Select any HTML element on a page and capture its screenshot. Download as PNG. Perfect for bug reports. JavaScript API demo.
Change the text input cursor color. See the effect live. Copy the minimal CSS. Simple but delightful.
Paste a user agent string to get a human-readable breakdown of browser, operating system, and device. See your own current agent info automatically.
Convert pixel values to viewport‑relative units (vw, vh, vmax, vmin) for a specified breakpoint. Includes DVH and SVH. Essential for fluid layouts.
Measure your browser's GPU compute power using a simple WebGPU matrix multiplication. See raw FLOPS and compare with peers. Fully client‑side.
Track attendance for multiple subjects. Mark present/absent and see percentage. Data in localStorage. Simple student tool.
Convert pixel values to viewport‑relative units (vw, vh, vmin, vmax) based on a selected breakpoint. Precise responsive design.
Turn your browser screen into a full‑color flashlight or strobe. Adjust brightness and color. Simple utility.
Play an audio file or use mic to see real‑time frequency bars. Choose colors. Great for music videos. Canvas.
Build a properly formatted robots.txt file with user-agent rules and sitemap location. Validate syntax in real time. Essential for webmasters.
Tap a glass icon each time you drink a cup of water. See your daily intake. Reminders optional. Local storage.
Adjust opacity visually with a slider and see the different CSS representations (opacity property vs RGBA/HSLA). Copy best option.
Enter two dates and see the exact number of days, weeks, and workdays between them. Also shows the countdown or days since.