UD5 Toolkit
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.
HTML Minifier Comparison - Online See Savings Live
HTML Minifier Comparison — See Savings Live
Paste your HTML, and instantly compare original vs. minified code. See how many bytes you save in real‑time.
Original Size
0 B
Minified Size
0 B
Savings
0 B
Reduction
0%
Original HTML
Minified Output
Minification preserves content inside
<pre>, <textarea>, <script>, and <style> tags. It safely removes comments and unnecessary whitespace.Frequently Asked Questions
HTML minification is the process of removing unnecessary characters from HTML code—such as whitespace, line breaks, and comments—without changing its functionality. This reduces file size, leading to faster page loads and bandwidth savings.
Simply paste your original HTML into the left editor. The tool instantly minifies it and displays the result on the right. Statistics above show the exact byte savings and percentage reduction, updated in real time as you edit.
Yes. Properly minified HTML remains perfectly valid and is understood by all browsers. Search engine crawlers can still parse it without issues. In fact, faster page speed can positively influence SEO rankings.
Absolutely. All processing happens inside your browser. Your HTML is never uploaded to any server, so your code remains completely private and secure.
To preserve functionality, this tool protects content inside
<pre>, <textarea>, <script>, and <style>. White space inside those tags is kept exactly as provided. All other unnecessary spaces and comments are safely removed.
This tool is specifically designed for HTML. For dedicated JavaScript or CSS minification, we recommend using specialized tools that handle syntax nuances correctly. However, inline scripts and styles within your HTML are preserved.
PX to EM/REM Converter - Online Responsive Unit Calculator
Convert pixel values to em and rem units based on a base font size. Bidirectional. Must‑have for front‑end developers.
:focus‑visible Tester - Online Keyboard‑Only Focus Ring
Compare :focus and :focus‑visible styling. See which one applies when using mouse vs. keyboard. Accessible focus management.
Speech Length Estimator – Online Words to Minutes
Paste your script and get an approximate speech duration based on slow/average/fast pace. Avoid overtime.
RSVP Speed Reading Trainer – Online Flash Words
Paste text and set display speed for Rapid Serial Visual Presentation. Train your reading speed.
Speech Recognition Tester - Online Web Speech API Demo
Test your browser's built‑in speech recognition. Speak and see the transcribed text appear live. Must‑have for voice app devs.
Robots.txt Validator & Parser - Online Check Syntax
Paste robots.txt content and parse it to check validity, find disallowed paths. Educational SEO tool. Local processing.
Sound Wave Extractor - Online Isolate Vocals or Instrumental
Simple phase cancellation tool: load a stereo track and attempt to remove center‑panned vocals. Not perfect, but fun to experiment.
Ovulation & Fertility Window Calculator - Online Cycle Tracker
Estimate ovulation day and fertility window from last menstrual period. Displays probable conception dates. Informational only; processes locally in browser.
caret‑color CSS Demo - Online Colorful Text Cursors
Change the text input cursor color. See the effect live. Copy the minimal CSS. Simple but delightful.
Simple Water Tracker - Online Click Glass Count
Tap a glass icon each time you drink a cup of water. See your daily intake. Reminders optional. Local storage.
Regex Catastrophic Backtracking Tester - Online Benchmark
Test a regex against long strings and measure execution time. Detect catastrophic backtracking patterns. Visual warning if slow.
Robots.txt Generator - Online Create & Validate Robots File
Build a properly formatted robots.txt file with user-agent rules and sitemap location. Validate syntax in real time. Essential for webmasters.
DOM Event Inspector - Online See All Event Listeners
Click any element on a demo page and see which events are attached. Visual debugger for event handling.
Speech Utterance Tester - Online Play Word by Word
Hear text spoken word by word with boundary events. See the exact index and character. Advanced TTS dev tool.
Reaction Time Test - Online Click & Sound
Measure your visual and auditory reaction speed. Average and best times shown. No data collected. Pure Javascript timing.
Speech Timer – Online Practice Presentations with WPM
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
Event Countdown Timer - Online Days Until Birthday Wedding Vacation
Set any future date and see a live countdown in days, hours, minutes, seconds. Fun animated display. Save multiple countdowns locally.
Meeting Speaker Timer - Online Countdown Per Agenda Item
Set a list of agenda items with allocated minutes. Advance through speakers and see remaining time visually. Keep meetings on track.
Sobriety Counter & Milestones - Online Recovery Tracker
Track days of sobriety with a motivational counter and milestone celebrations. Set quit date and see time elapsed in days, hours, minutes. Private & local.
Speech to Text Dictation - Online Transcribe Audio & Mic
Use your microphone to dictate text and see it appear live. Also upload an audio file for basic transcription. All local.
Speech to Text Dictation - Online Transcribe Audio & Mic
Use your microphone to dictate text and see it appear live. Also upload an audio file for transcription (limited). All local.
Voice Memo Recorder - Online Record & Download Audio
Record audio directly from your microphone and download it as a WAV file. Perfect for quick notes. No upload, fully offline support.
Virtual Flashlight - Online Color & Strobe Screen
Turn your browser screen into a full‑color flashlight or strobe. Adjust brightness and color. Simple utility.
Random User Agent String Generator - Online for Testing
Generate a realistic, random user‑agent string for desktop, mobile, or bot. Perfect for API testing and scraping.
Web USB Console - Online Claim & Talk to USB Device
Request a USB device and communicate with it using the Web USB API. See vendor and product IDs. Experimental.
Simple Invoice Generator - Online Create & Print Invoices Free
Fill in your details and generate a professional‑looking invoice ready to print or save as PDF. No sign‑up, all data stays on your device.
Simple Invoice Generator - Online Create & Print Invoices Free
Fill in your details and generate a professional-looking invoice ready to print or save as PDF. No sign-up, all data stays on your device. Great for freelancers.
Potty Training Log – Online Record Accidents & Successes
Simple tracker to record potty attempts, successes, accidents. See patterns. Data stays local. Aids in toilet training journey.
Spelling Test Practice - Online Audio Dictation & Typing
Hear a word spoken by browser TTS and type the spelling. Choose difficulty or paste your own list. Great for kids. Local only.