# PhuDuy Tools (phuduygroup.com)

> Universal Suite of 180+ In-Browser Micro-Tools. 100% Client-Side RAM Processing. Zero Server Uploads. Zero Data Leakage. Free forever.

PhuDuy Tools is an ultra-fast, privacy-first web utility platform offering over 180 developer tools, PDF utilities, graphic converters, text processors, calculators, and hardware diagnostics. Every tool runs entirely within the client's web browser using WebAssembly, Web Audio API, and HTML5 Canvas, ensuring complete data security.

- **Website:** https://phuduygroup.com/
- **Supported Locales:** English (/), Vietnamese (/vi/), Spanish (/es/), French (/fr/), Japanese (/ja/)
- **License / Privacy:** 100% Client-Side In-Memory Execution, No Tracking, No Server Storage

---

## Directory of Tools by Category

### Developer, Data & Code Tools

- [JSON to TypeScript & Zod](https://phuduygroup.com/json-to-typescript/): Convert JSON payloads into TypeScript interfaces, type aliases, and Zod runtime validation schemas with AST type inference 100% in-browser.
- [Text AES-256 Encrypt & Decrypt](https://phuduygroup.com/text-encryptor/): Military-grade AES-GCM 256 text encryption with PBKDF2 key derivation and zero server leaks.
- [JSON Formatter & Types](https://phuduygroup.com/json-formatter/): BigInt precision, 1-click auto-repair syntax & instant TypeScript/Go struct generator.
- [Semantic JSON Diff](https://phuduygroup.com/json-compare/): Order-independent semantic comparison, ignore volatile keys & RFC 6902 Patch export.
- [JSON Validator & Linter](https://phuduygroup.com/json-validator/): Precision line & column error locator, 1-click magic auto-fix and JSON Schema auditor.
- [Base64 Universal Studio](https://phuduygroup.com/base64-encode/): Lossless UTF-8, Base64URL safe mode, File to Data URI & binary Magic Bytes sniffer.
- [Base64 Decoder & Recovery](https://phuduygroup.com/base64-decode/): Decode UTF-8 text, automatic padding restore, binary Magic Bytes (PNG, PDF) sniffer.
- [URL Encoder Studio](https://phuduygroup.com/url-encode/): Strict RFC 3986 OAuth, component vs full URL, + or %20 spaces & visual query builder.
- [URL Decoder & UTM Cleaner](https://phuduygroup.com/url-decode/): Crash-proof lenient fallback, form + to space, multi-pass decode & 1-click UTM cleaner.
- [JWT Parser & Verifier](https://phuduygroup.com/jwt-parser/): Zero cloud leak, 3-color breakdown, live expiration countdown & offline HS256 signature verifier.
- [CSV to JSON Studio](https://phuduygroup.com/csv-to-json/): RFC 4180 quotes safe, smart type inference, auto-delimiter sniffer & 3 JSON formats.
- [JSON to CSV (Excel BOM)](https://phuduygroup.com/json-to-csv/): Recursive nested key flattening, authentic UTF-8 BOM for Microsoft Excel & live table grid.
- [XML Validator & Linter](https://phuduygroup.com/xml-validator/): Precision line/column locator, W3C well-formed linter, e-invoice auditor & XPath evaluator.
- [XML Formatter & Prettifier](https://phuduygroup.com/xml-formatter/): 2/4 space indentation, production minifier, tree hierarchy viewer & XML to JSON converter.
- [UUID v4 & v7 Studio](https://phuduygroup.com/uuid-generator/): CSPRNG cryptographic randomness, modern time-ordered UUID v7 for databases & bulk generator.
- [UUID Validator & Inspector](https://phuduygroup.com/uuid-validate/): Decode v1-v7 versions, extract embedded creation timestamps & normalize hyphen syntax.
- [Hash & Checksum Studio](https://phuduygroup.com/hash-generator/): Multi-hash SHA-256, SHA-512, MD5, SHA-1 grid, HMAC keyed-hash & instant file checksum matcher.
- [Regex Tester & Debugger](https://phuduygroup.com/regex-tester/): Rainbow group highlighting, auto syntax explainer, ReDoS guard & multi-language code generation.
- [Unix Timestamp Converter](https://phuduygroup.com/unix-timestamp/): Live ticking epoch clock with freeze mode, auto s/ms detection & JWT expiration date math.
- [YAML Formatter & Validator](https://phuduygroup.com/yaml-formatter/): Standard 2-space indentation, forbidden tab detector & 1-click fix, K8s multi-doc & YAML ⇄ JSON.
- [HTTP Status & Headers](https://phuduygroup.com/http-status/): Instant 1xx-5xx lookup, root cause diagnostics, Frontend/DevOps checklists & OWASP headers.
- [MIME Types & Magic Bytes](https://phuduygroup.com/mime-types/): Bidirectional Content-Type lookup, Nginx/Apache config generator & client-side binary Magic Bytes sniffer.
- [Cron Expression Studio](https://phuduygroup.com/cron-expression/): Visual crontab builder, natural language explainer, next 5 runs timeline (Local & UTC) & code generator.
- [SQL Formatter & Beautifier](https://phuduygroup.com/sql-formatter/): Auto-indent PostgreSQL, MySQL, T-SQL, Oracle; uppercase keywords, custom commas & 1-click minifier.
- [SEO Meta Tag & Social Studio](https://phuduygroup.com/meta-tag-generator/): Generate SEO meta tags, measure Google SERP pixel width, and preview live cards on Zalo, Facebook, and X.
- [Robots.txt Builder & AI Shield](https://phuduygroup.com/robots-txt-generator/): Visual RFC 9309 robots.txt generator: 1-click AI scraper firewall, live path sandbox tester, and UTF-8 file export.
- [Number Base & Bitwise Studio](https://phuduygroup.com/number-base-converter/): Arbitrary-precision BigInt base converter with 64-bit interactive bitboard toggler, Two's Complement, and bitwise operations.
- [Binary Converter](https://phuduygroup.com/binary-converter/): Convert binary strings to decimal, hexadecimal, and octal with BigInt precision, 64-bit interactive bitboard, and Two's Complement 100% Client-Side.
- [Bitwise Calculator](https://phuduygroup.com/bitwise-calculator/): Calculate AND, OR, XOR, NOT, Bit Shifts with 64-bit interactive bitboard toggler, Two's Complement, and BigInt precision 100% Client-Side.
- [Epoch Converter & Unix Timestamp Studio (Seconds, Millis, Microseconds)](https://phuduygroup.com/epoch-converter/): Convert Epoch to human-readable dates and back.
- [Hex Converter](https://phuduygroup.com/hex-converter/): Convert hexadecimal to decimal, binary, and octal with BigInt precision, 64-bit interactive bitboard, and Two's Complement 100% Client-Side.
- [Open Graph Generator](https://phuduygroup.com/open-graph-generator/): Generate Open Graph tags (og:title, og:image, og:description) with live visual previews for Facebook, Zalo, Twitter, and LinkedIn.
- [Visual Robots.txt Builder](https://phuduygroup.com/robots-txt-builder/): Build and customize your robots.
- [Robots.txt Tester](https://phuduygroup.com/robots-txt-tester/): Test whether URLs are allowed or blocked by robots.
- [Social Preview Tool](https://phuduygroup.com/social-preview/): Preview how your website link looks when shared on Facebook, Zalo, Twitter/X, and Google Search.

### PDF, Image & Multimedia Tools

- [Universal Image Converter](https://phuduygroup.com/image-converter/): Batch convert images between WebP, PNG, JPG, and BMP in local browser memory with size savings calculation.
- [Batch Image Resizer Studio](https://phuduygroup.com/image-resizer/): Batch resize images by exact pixels, percentage scale, or social media dimensions in local browser RAM with bicubic interpolation.
- [PDF Page Rotator & Reorder Studio](https://phuduygroup.com/pdf-page-rotator/): Rotate PDF pages 90° or 180°, rearrange page sequences, and delete unwanted pages client-side with zero server uploads.
- [PDF Watermark Studio](https://phuduygroup.com/pdf-watermark/): Stamp confidential, draft, or copyright watermarks across PDF pages in local RAM via pdf-lib. 100% private.
- [Batch Image Watermark Studio](https://phuduygroup.com/image-watermark/): Batch watermark photos with custom text or transparent logos in local RAM. Anti-crop tiled patterns and 9-grid anchors.
- [Voice to Text Studio (STT)](https://phuduygroup.com/speech-to-text/): Transcribe spoken words into text in real time with multilingual speech recognition, live streaming, and quick punctuation.
- [Text to Speech Studio (TTS)](https://phuduygroup.com/text-to-speech/): Convert text into natural speech with real-time word tracking, multilingual voices, and tuning directly in your browser.
- [SVG to PNG & WebP Converter](https://phuduygroup.com/svg-to-png/): Rasterize SVG vector files to crisp transparent PNG, WebP, or JPEG up to 8x resolution in local RAM.
- [Color Palette Extractor](https://phuduygroup.com/palette-extractor/): Extract dominant color schemes from images with 4x loupe eyedropper and CSS/Tailwind export.
- [Photo Filter & Color Grading](https://phuduygroup.com/image-filter/): Apply 12+ cinematic photo filters with live Before/After comparison and high-res Canvas export.
- [Voice Recorder & Audio Memo](https://phuduygroup.com/voice-recorder/): Studio microphone voice recorder with live waveform visualizer, noise suppression, and lossless WAV export.
- [Screen & Audio Recorder](https://phuduygroup.com/screen-recorder/): Record desktop screens, app windows, and tabs with microphone voiceover and zero watermarks.
- [Photo EXIF & GPS Metadata Remover](https://phuduygroup.com/exif-remover/): Scrub sensitive GPS geolocation coordinates, camera serials, and hidden tags from photos in local RAM.
- [Audio Trimmer & Ringtone Maker](https://phuduygroup.com/audio-trimmer/): Trim MP3, WAV, AAC audio with millisecond waveform precision and lossless local export.
- [Image Crop & Social Resize](https://phuduygroup.com/image-cropper/): Crop photos to 1:1, 16:9, 9:16, 4:5 social media aspect ratios with loss-free Canvas export.
- [Images to PDF Converter](https://phuduygroup.com/images-to-pdf/): Convert bulk JPG, PNG, and WebP images into a consolidated professional PDF document.
- [PDF Splitter & Page Extractor](https://phuduygroup.com/pdf-splitter/): Extract custom page ranges, split multi-page PDFs, or isolate pages 100% in-browser memory.
- [QR Code Generator](https://phuduygroup.com/qr-code-generator/): 100% permanent static QR codes with custom styling, center logo overlay, and vector SVG export.
- [QR Generator Online](https://phuduygroup.com/qr-generator/): Create styled QR codes for websites, WiFi networks, VCard contacts, and emails 100% free.
- [Barcode Generator](https://phuduygroup.com/barcode-generator/): Generate CODE128, EAN-13, and UPC barcodes with automated GS1 modulo-10 checksum calculations and SVG export.
- [Online Barcode Maker](https://phuduygroup.com/barcode-maker/): Create thermal sticker barcodes for retail goods, warehouse assets, and logistics waybills.
- [Image Compressor & WebP Studio Pro](https://phuduygroup.com/image-compressor/): Reduce JPG, PNG, and WebP file size up to 85% with 100% Client-Side privacy and interactive split-view comparison.
- [Merge PDF Documents Studio Pro](https://phuduygroup.com/pdf-merger/): Combine multiple PDF files into one consolidated document with flexible page ranges and rotation, 100% private in-browser.

### CSS, SVG & Design Tools

- [Universal Color Converter & WCAG](https://phuduygroup.com/color-converter/): Bidirectional conversion between HEX, RGB, HSL, CMYK, and modern OKLCH with real-time WCAG 2.1 contrast audits and EyeDropper.
- [Aspect Ratio & Dimension Studio](https://phuduygroup.com/aspect-ratio/): Calculate aspect ratios, resize with ratio lock, preview TikTok/Reels safe zones, and export modern CSS code.
- [Box Shadow & Glass Studio](https://phuduygroup.com/box-shadow/): Smooth multi-layer shadows (Stripe style), frosted glassmorphism backdrop blur, and Tailwind arbitrary classes.
- [CSS Visual Effects Studio](https://phuduygroup.com/css-effects/): Multi-stop Gradient generator, 8-value organic border-radius blob morpher, and precision clip-path polygon cutter with Tailwind export.
- [CSS Grid & Flexbox Studio](https://phuduygroup.com/css-grid-generator/): Visual CSS Grid & Flexbox layout builder: paint grid-template-areas, customize gap, simulate mobile widths, and export Tailwind.
- [Universal Favicon & App Icon Studio](https://phuduygroup.com/favicon-generator/): Multi-layer binary ICO packer, Apple Touch Icon, Android PWA icons, site.webmanifest, and 1-click ZIP package download.
- [SVG Optimizer & React JSX Studio Pro](https://phuduygroup.com/svg-optimizer/): Strip metadata bloat, precision-round coordinates, compress file size up to 70%, and generate React JSX components.
- [Aspect Ratio Calculator](https://phuduygroup.com/aspect-ratio-calculator/): Free Aspect Ratio Calculator: Calculate 16:9, 4:3, 9:16 proportions, find missing width or height, preview live canvas boxes, and export CSS aspect-ratio code.
- [8-Value Border Radius Generator](https://phuduygroup.com/border-radius-generator/): Sculpt organic blobs, fluid pebbles, and teardrops with full 8-value CSS border-radius, morphing @keyframes animation, and Tailwind export 100% Client-Side.
- [CSS Clip-Path Generator](https://phuduygroup.com/css-clip-path/): Create custom CSS clip-path polygon masks with precision percentage vertices, curated geometric presets, and 1-click Tailwind export 100% Client-Side.
- [CSS Flexbox Generator](https://phuduygroup.com/css-flex-generator/): Build CSS Flexbox layouts with interactive justify-content, align-items, flex-wrap controls, mobile width resizer, and 1-click Tailwind export 100% Client-Side.
- [CSS Layout Studio](https://phuduygroup.com/css-layout/): Design modern CSS Grid and Flexbox layouts with interactive visual painting, pre-built templates, responsive mobile simulation, and Tailwind export 100% Client-Side.
- [CSS Gradient Generator](https://phuduygroup.com/gradient-generator/): Design multi-stop Linear, Radial, and Conic CSS gradients with live Sandbox preview, curated palettes, and 1-click Tailwind export 100% Client-Side.
- [CSS Shadow Generator](https://phuduygroup.com/shadow-generator/): Free online CSS shadow generator: Generate realistic multi-layer shadows, neon glow auras, and frosted glassmorphism cards.

### Text, Typography & Content Tools

- [Case Converter](https://phuduygroup.com/case-converter/): Instantly transform text to UPPERCASE, lowercase, Title Case, camelCase & snake_case.
- [Word Counter Pro](https://phuduygroup.com/word-counter/): Real-time word, character, sentence counter with reading & speaking time estimation.
- [Reading Time Calculator](https://phuduygroup.com/reading-time/): Accurately calculate silent reading (200 WPM) and speech delivery (130 WPM) duration.
- [Remove Duplicate Lines](https://phuduygroup.com/remove-duplicate-lines/): Clean raw data lists, deduplicate text entries and sort lines in zero milliseconds.
- [Character & Byte Counter](https://phuduygroup.com/character-counter/): Count total UTF-8 bytes, characters with and without whitespace for SEO & social limits.
- [Line Counter & SLOC](https://phuduygroup.com/line-counter/): Count empty lines, code vs comments (SLOC), longest line position, and Clean Code standards.
- [Remove Empty Lines](https://phuduygroup.com/remove-empty-lines/): Strip blank lines or collapse multiple empty spaces into clean single breaks.
- [Sort Lines Studio](https://phuduygroup.com/sort-lines/): Sort text lines A-Z, natural numbers, line length, or CSV columns with zero tracking.
- [Reverse Text & 180° Flip](https://phuduygroup.com/reverse-text/): Reverse characters, words, flip upside down 180°, and generate mirror text safely.
- [Reverse Lines Order](https://phuduygroup.com/reverse-lines/): Invert lines bottom-to-top for server logs and lists without modifying text within rows.
- [Text & Code Diff Checker](https://phuduygroup.com/text-compare/): Compare two texts side-by-side or unified, highlight word-level diffs, and export audit reports.
- [Find & Replace Studio](https://phuduygroup.com/find-replace/): Smart case-preserving, live match highlight, regex capture groups, and multi-rule batch replacements.
- [SEO Slug Generator](https://phuduygroup.com/slug-generator/): Generate clean URL slugs with accurate Vietnamese diacritic removal, stop-words filter & batch CSV export.
- [Lorem Ipsum & Dummy Text](https://phuduygroup.com/lorem-ipsum/): Classical Cicero Latin, natural Vietnamese dummy text, Tech buzzwords, and automatic HTML wrappers.
- [Markdown Live Preview](https://phuduygroup.com/markdown-preview/): Real-time GFM preview, synchronized scrolling, 1-click rich text copy to Word and PDF export.
- [Markdown Live Editor](https://phuduygroup.com/markdown-editor/): Professional Markdown editor with Ctrl+B/I shortcuts, soft Tab indents, Zen focus mode and HTML export.
- [HTML Entity Escape](https://phuduygroup.com/html-escape/): Escape special characters to Named, Decimal & Hex entities with live XSS security vector inspection.
- [HTML Entity Unescape](https://phuduygroup.com/html-unescape/): Decode HTML entities, restore original UTF-8 characters from decimal/hex tokens, and clean scraped feeds.
- [Sentence Counter](https://phuduygroup.com/sentence-counter/): Smart sentence boundary detector, abbreviation filtering & sentence rhythm inspector.
- [Word Frequency & N-Gram](https://phuduygroup.com/word-frequency/): 1-word, 2-word, 3-word phrase clustering, Vietnamese stop words filter & Panda alerts.
- [Remove Extra Spaces](https://phuduygroup.com/remove-extra-spaces/): Collapse consecutive spaces, trim lines, convert tabs to spaces & clean NBSP characters.
- [Text to Binary Converter](https://phuduygroup.com/text-to-binary/): Convert text to 8-bit binary, hexadecimal & decimal with lossless UTF-8 Vietnamese & Emoji support.
- [Binary to Text Decoder](https://phuduygroup.com/binary-to-text/): Translate binary 0s and 1s to plain text with UTF-8 support and continuous bitstream parser.
- [Fun Typography & ASCII Art Studio](https://phuduygroup.com/fancy-text/): Aesthetic Unicode fonts, upside-down 180° text, Zalgo glitch chaos, 200+ Japanese Kaomoji, and ASCII big text banners.
- [ASCII Art & Big Text Generator](https://phuduygroup.com/ascii-art/): Convert words into giant 3D block ASCII text banners: copy for GitHub READMEs, Discord codeblocks, and terminal headers 100% Client-Side.
- [Emoji Picker & Bilingual Unicode Search Engine](https://phuduygroup.com/emoji-picker/): Search and copy emojis instantly: bilingual English & Vietnamese keyword search, categorized icons, and pop audio feedback 100% Client-Side.
- [Japanese Kaomoji & Text Emoticons](https://phuduygroup.com/kaomoji/): Discover 200+ Japanese Kaomoji emoticons: shrugs, table flips, cute hugs, happy anime smiles, and animals with 1-click audio copy 100% Client-Side.
- [Zalgo Glitch Text Generator](https://phuduygroup.com/text-glitch/): Generate scary Zalgo glitch text with customizable chaos sliders: spooky Halloween fonts, cyberpunk hacker distortion, and 1-click copy 100% Client-Side.
- [Upside Down & Mirror Text Generator](https://phuduygroup.com/upside-down-text/): Flip text 180 degrees upside down or backwards: create riddles, cool social handles, and inverted messages with 1-click copy 100% Client-Side.

### Math, Finance & Converters

- [GPA & Grade Calculator](https://phuduygroup.com/gpa-calculator/): Cumulative 4.0 & 10.0 scale GPA, letter grades, course weights, and Target GPA What-If simulator.
- [Weighted Grade Calculator](https://phuduygroup.com/grade-calculator/): Calculate course final scores from syllabus component percentages with letter grade conversion.
- [Online Calculator](https://phuduygroup.com/calculator/): Standard & scientific online calculator with strict PEMDAS precedence, calculation tape, and numpad support.
- [Scientific Calculator](https://phuduygroup.com/scientific-calculator/): Advanced scientific functions: trigonometry, logarithms, powers, roots, DEG/RAD angle modes & memory tape.
- [Calculator Online Studio](https://phuduygroup.com/calculator-online/): Professional browser calculator with hardware numpad support, haptic sound, and 100% client-side privacy.
- [Percentage & Margin Calculator](https://phuduygroup.com/percentage-calculator/): Solve 5 core percentage problems, convert Profit Margin vs Markup, and calculate stacked discounts 100% Client-Side.
- [Online Percent Calculator](https://phuduygroup.com/percent-calculator/): Instant proportion calculator, growth rate analyzer, and reverse tax calculator with step-by-step math breakdowns.
- [Universal Unit Converter](https://phuduygroup.com/unit-converter/): Universal converter across 9 measurement systems: Length, Weight, Temperature, Area, Volume, Speed, Pressure, and Data.
- [Length & Distance Converter](https://phuduygroup.com/length-converter/): Convert meters, feet, inches, centimeters, kilometers, yards, miles, and nautical miles with live multi-unit matrix.
- [Weight & Mass Converter](https://phuduygroup.com/weight-converter/): Convert kg, pounds (lbs), ounces, grams, metric tons, carats, and traditional Vietnamese gold units (luong, chi).
- [Temperature Converter](https://phuduygroup.com/temperature-converter/): Instant temperature conversion between Celsius (°C), Fahrenheit (°F), and Kelvin (K) with zero latency.
- [Currency Converter & Card Fee](https://phuduygroup.com/currency-converter/): Live foreign exchange rates, international bank card fee simulation (+2.5%), custom rates, and 100% Offline mode.
- [Exchange Rate Calculator](https://phuduygroup.com/exchange-rate-calculator/): Multi-currency live comparison grid with custom cash rates and Vietnamese numbers-to-words translation.
- [BMI & Body Health Calculator](https://phuduygroup.com/bmi-calculator/): Dual Asian (IDI & WPRO) and WHO standards, ideal body weight bracket, BMR, and daily calorie burn TDEE.
- [TDEE Calorie Calculator](https://phuduygroup.com/tdee-calculator/): Calculate Total Daily Energy Expenditure and resting BMR with tailored deficit/surplus meal planning.
- [Fuel & Trip Cost Calculator](https://phuduygroup.com/fuel-calculator/): Calculate gas/petrol consumption, roundtrip travel budget, highway tolls, and split costs evenly among passengers.
- [Tip & Bill Splitter Studio](https://phuduygroup.com/tip-calculator/): Calculate tip percentages, restaurant sales taxes, and split dining bills evenly per diner with auto rounding.
- [Statistical & Average Studio](https://phuduygroup.com/average-calculator/): Descriptive statistics calculator: compute Mean, Median, Mode, StDev, Variance, IQR, and interactive SVG Box-Plot.
- [Area & Land Measurement Converter](https://phuduygroup.com/area-converter/): Accurately convert traditional Vietnamese land units (Sao Bac, Sao Trung, Cong Nam), Hectares, Acres, and apartment Square Feet.
- [Volume & Kitchen Converter](https://phuduygroup.com/volume-converter/): Convert culinary cups, tablespoons, teaspoons, fluid ounces, liters, m³ water, and gallons with fraction input support.
- [Speed & Running Pace Converter](https://phuduygroup.com/speed-converter/): Convert treadmill km/h to running pace min/km, predict 5K/10K/HM/FM finish times, and convert km/h, mph, knot, Mach.
- [Pressure & Tire PSI Converter](https://phuduygroup.com/pressure-converter/): Convert tire pressure between Bar, PSI, and kg/cm² with dynamic gauge dial, plus 10-unit engineering and medical matrix.
- [Data Size & Storage Decoder](https://phuduygroup.com/data-size-converter/): Decode why 1TB drives show 931GB on Windows, estimate download times from ISP Mbps, and convert SI 1000 vs IEC 1024.
- [Angle & Unit Circle Studio](https://phuduygroup.com/angle-converter/): Convert degrees to exact reduced Pi radians, gradians, and MOA with interactive SVG unit circle and live sin/cos/tan.
- [VAT & Sales Tax Calculator](https://phuduygroup.com/vat-calculator/): Add sales tax (+VAT) or reverse extract net price (-VAT) with 100% accounting accuracy, 8%, 10%, 5% rates, and words conversion.
- [Loan & Mortgage Amortization Studio Pro](https://phuduygroup.com/loan-calculator/): Professional bank loan and mortgage calculator: reducing balance, fixed EMI, floating interest simulator, and full amortization schedule.
- [Time Duration & Timesheet Studio Pro](https://phuduygroup.com/time-difference/): Accurately measure duration between timestamps, handle overnight shifts, deduct lunch breaks, and convert to payroll decimal hours.
- [Compound Interest & DCA Wealth Studio Pro](https://phuduygroup.com/compound-interest/): Model exponential wealth growth: recurring monthly contributions (DCA), inflation purchasing power, and Rule of 72 doubling time.
- [Date Difference & Business Days Studio Pro](https://phuduygroup.com/date-difference/): Calculate calendar duration, business working days (excluding weekends & holidays), Y-M-D conversion, and project deadline forecasting.
- [Statistics Calculator Online](https://phuduygroup.com/statistics-calculator/): Free descriptive statistics calculator: compute Mean, Median, Mode, Standard Deviation, Variance, Quartiles, and render interactive SVG Box-Plots 100% Client-Side.
- [Trip Cost Calculator](https://phuduygroup.com/trip-cost/): Plan and budget your road trip costs online: Gas consumption, highway tolls, parking expenses, and instant per-person splitting for cars & motorcycles.

### Device, Hardware & Network Diagnostics

- [Hardware Diagnostics Studio](https://phuduygroup.com/hardware-test/): All-in-one browser hardware benchmark: Test keyboard NKRO, mouse polling rate, stereo speakers, webcam, and mic.
- [Device & Privacy Inspector](https://phuduygroup.com/device-info/): Inspect device specs, unmask true WebGL GPU, dynamic viewport meter, battery monitor, and WebRTC IP leak audit.
- [Clipboard Inspector & Security Shield](https://phuduygroup.com/clipboard-test/): Inspect multi-MIME clipboard payloads (Text, HTML, Screenshot Image), detect zero-width characters and pastejacking traps.
- [Battery Status Checker Online](https://phuduygroup.com/battery-info/): Check laptop and mobile battery percentage, charging state, and AC power status online 100% Client-Side with real-time browser Battery API support.
- [Browser Info & User Agent Checker](https://phuduygroup.com/browser-info/): Inspect browser engine, operating system, raw User-Agent string, system timezone, and privacy headers (DNT/GPC) online 100% Client-Side.
- [Webcam Tester Online](https://phuduygroup.com/camera-test/): Test webcam online: live resolution, framerate, autofocus check, and fullscreen monitor dead pixel audit 100% Client-Side with zero server recording.
- [WebRTC IP Leak Checker](https://phuduygroup.com/ip-webrtc-check/): Audit WebRTC IP leaks online: discover whether active VPN tunnels are leaking real ISP IP addresses via browser STUN candidates 100% Client-Side.
- [Keyboard Tester Online](https://phuduygroup.com/keyboard-tester/): Test every key on your physical keyboard online.
- [Microphone Tester Online](https://phuduygroup.com/microphone-test/): Test microphone online: live volume VU decibel meter, assess background noise floor, and record a 5-second voice loopback 100% Client-Side.
- [Mouse Tester Online](https://phuduygroup.com/mouse-tester/): Test mouse left, right, middle, side buttons, scroll wheel, sensor jitter, and measure real-time polling rate (Hz) online 100% Client-Side.
- [Screen Resolution Checker](https://phuduygroup.com/screen-resolution/): Check your monitor resolution, real-time responsive viewport dimensions, Retina Device Pixel Ratio (DPR), and color depth online 100% Client-Side.
- [Speaker Tester Online](https://phuduygroup.com/speaker-test/): Test laptop and desktop speakers online: Stereo Left/Right separation, 20Hz-20,000Hz frequency tone sweeper to detect rattling and blown cones 100% Client-Side.

### Productivity & Time Management

- [Pomodoro Timer Pro](https://phuduygroup.com/pomodoro-timer/): Focus timer with 25/5/15 cycles, soothing harmonic Zen chime, ambient rainfall noise & session tracker.
- [Countdown & Exam Timer](https://phuduygroup.com/countdown-timer/): Classroom exam timer with projector fullscreen mode, Screen Wake Lock API & 3-stage visual color warnings.
- [Quiz & Speed Game Timer](https://phuduygroup.com/quiz-timer/): Per-question quiz timer (15s-60s) with live question progress tracking and 5-second countdown beeps.
- [Typing Speed Test](https://phuduygroup.com/typing-test/): Precision WPM & accuracy test, IME-safe Vietnamese Telex/VNI engine, and mechanical ASMR sounds.
- [Touch Typing Practice](https://phuduygroup.com/typing-practice/): Master touch typing with interactive 10-finger visual keyboard guidance and Home Row drills.
- [Stopwatch & Lap Timer](https://phuduygroup.com/stopwatch/): High-precision millisecond stopwatch (1/100s), anti-drift background timing, fastest/slowest lap detection & CSV export.
- [Digital & World Clock](https://phuduygroup.com/digital-clock/): Aesthetic fullscreen desk clock, 12h/24h formats, Screen Wake Lock, 528Hz hourly chime & world time matrix.
- [Study Planner & Kanban](https://phuduygroup.com/study-planner/): Agile 3-column Kanban study board, Eisenhower priority matrix, subject task manager & JSON backup.
- [Flashcards & Spaced Repetition](https://phuduygroup.com/flashcards/): Fluid 3D card flips, Active Recall algorithm, 1-second Excel bulk import, and Spaced Repetition loop.
- [World Clock & Meeting Planner](https://phuduygroup.com/time-zone-converter/): Global timezone converter with 24-hour synchronized slider, working hours heatmap, DST-proof IANA engine, and Google Calendar export.
- [Productivity Desk & Sticky Notes](https://phuduygroup.com/productivity-workspace/): 4-in-1 personal desk: pastel sticky notes, prioritized To-Do planner, 14-day habit streak heatmap, and live meeting cost meter.
- [Interactive Desk Calendar & Lunar](https://phuduygroup.com/calendar/): Interactive monthly calendar with Vietnamese astronomical lunar dates (GMT+7), Can Chi zodiac, private event markers, and A4 print mode.
- [Daily Planner & Task Focus Studio](https://phuduygroup.com/daily-planner/): Plan your day with laser focus: Eisenhower priority to-do lists, habit tracker, sticky notes, and printable daily agendas 100% Client-Side.
- [Habit Tracker Matrix](https://phuduygroup.com/habit-tracker/): Build lasting personal habits with an interactive 14-day GitHub-style commit heatmap, streak counters, and zero-cloud privacy 100% Client-Side.
- [Interactive Desk Calendar & Lunar Studio Pro](https://phuduygroup.com/interactive-calendar/): Minimalist monthly calendar with Vietnamese astronomical lunar dates (GMT+7), Can Chi zodiac, private event markers, holiday countdowns, and A4 print mode 100% Client-Side.
- [International Meeting Planner](https://phuduygroup.com/meeting-planner/): Plan global team meetings with 24-hour interactive synchronized slider, overlapping working hours heatmap, DST-proof IANA engine, and 1-click Google Calendar invite export 100% Client-Side.
- [Meeting Timer & Real-Time Cost Meter](https://phuduygroup.com/meeting-timer/): Real-time meeting timer and cost counter: visualize corporate meeting expenses live by team headcount and hourly wages 100% Client-Side.
- [Sticky Notes Online](https://phuduygroup.com/sticky-notes/): Free online sticky notes: create pastel memos, pin important reminders, organize thoughts, and auto-save locally 100% Client-Side.
- [To-Do List & Task Manager](https://phuduygroup.com/todo-list/): Minimalist online to-do list: prioritize tasks, track progress percentages, enjoy crisp completion audio, and print checklists 100% Client-Side.
- [World Clock](https://phuduygroup.com/world-clock/): Track world clock times across major global cities with 24-hour interactive synchronized slider, automatic DST adjustment, and working hours visualizer 100% Client-Side.

### Random Generators & Decision Utilities

- [Wheel of Names & Picker](https://phuduygroup.com/wheel-of-names/): 60 FPS Canvas physics wheel, acoustic ticker audio, no-repeat winner mode & team splitter.
- [Random Student Picker](https://phuduygroup.com/random-student/): Unbiased classroom student caller with no-repeat mode, winner history, and zero ads.
- [Random Group Generator](https://phuduygroup.com/random-group/): Split students and coworkers into balanced teams using Fisher-Yates shuffle algorithm.
- [Strong Password Generator](https://phuduygroup.com/password-generator/): Hardware Web Crypto CSPRNG generator, memorable XKCD passphrases, and brute-force crack time estimator.
- [Random Password Generator](https://phuduygroup.com/random-password/): Generate random passwords with custom lengths, character sets, and cryptographic hardware entropy.
- [Password Strength Checker](https://phuduygroup.com/password-strength-checker/): Calculate cryptographic entropy bits, simulate brute-force GPU crack time, and audit security criteria.
- [Random String & Voucher Generator](https://phuduygroup.com/random-string/): Generate random strings, coupon voucher patterns, and API tokens with guaranteed deduplication and hardware CSPRNG.
- [Random Token & API Key Maker](https://phuduygroup.com/random-token/): Generate cryptographically secure API keys, Bearer tokens, and Hex 256/512-bit secrets for backend development.
- [3D Coin Flip & Dice Studio](https://phuduygroup.com/coin-flip/): 3D virtual coin toss and polyhedral dice roller (D4-D100) with realistic Web Audio physics and CSPRNG fairness.
- [Lucky Draw & Decision Studio Pro](https://phuduygroup.com/random-generator/): 5-in-1 random suite: lottery numbers, 60FPS wheel of fortune, balanced team splitter, name picker, and 52-card deck with CSPRNG.
- [3D Random Playing Card Drawer](https://phuduygroup.com/random-card/): Draw playing cards from a 52-card deck without duplicate draws, smooth 60fps 3D flips, shuffle audio, and King's Cup rules.
- [Random Color & Palette Studio](https://phuduygroup.com/random-color/): Generate aesthetic colors with Pastel, Neon, Vintage filters, auto WCAG contrast, Spacebar shortcuts, and OKLCH / CSS export.
- [Random Emoji & Story Prompts](https://phuduygroup.com/random-emoji/): Generate random Unicode emojis across 8 categories, create party movie-guessing challenges, and export transparent PNGs.
- [Dice Roller 3D](https://phuduygroup.com/dice-roller/): Roll virtual 3D dice online with authentic physics and cup rattle sounds.
- [Lucky Draw Online](https://phuduygroup.com/lucky-draw/): Host exciting corporate lucky draws: high-speed number rolls, fullscreen stage projector view, CSPRNG fairness, and confetti celebrations 100% Client-Side.
- [3D Random Playing Card Drawer & King's Cup Party Game Pro](https://phuduygroup.com/random-card-drawer/): Draw random playing cards from an authentic 52-card deck without duplicate draws, smooth 60fps 3D flips, shuffle audio, and King's Cup rules 100% Client-Side.
- [Random Dice Roller](https://phuduygroup.com/random-dice/): Generate random dice rolls with realistic 3D tumbling physics and sound effects.
- [Random Name Picker](https://phuduygroup.com/random-name/): Pick fair random names from any roster: spotlight text animations, multiple winners, exclude drawn candidates, and confetti 100% Client-Side.
- [Random Number Generator](https://phuduygroup.com/random-number/): Generate truly fair random numbers within any range: slot rolling animations, non-repeating draws, zero padding, and confetti 100% Client-Side.
- [Random Team Splitter & Fair Group Generator](https://phuduygroup.com/random-team/): Divide students and colleagues into balanced teams in one click: Fisher-Yates cryptographic shuffling, instant team cards, and chat export 100% Client-Side.
- [Wheel of Fortune Online](https://phuduygroup.com/wheel-of-fortune/): Customizable online wheel of fortune: 60FPS canvas rotation, mechanical peg ticks, customizable prize slices, and confetti celebrations 100% Client-Side.

---

## Multilingual URL Architecture
For any tool URL (e.g. `https://phuduygroup.com/{slug}/`), localized versions are available at:
- **English (Default):** `https://phuduygroup.com/{slug}/`
- **Vietnamese:** `https://phuduygroup.com/vi/{slug}/`
- **Spanish:** `https://phuduygroup.com/es/{slug}/`
- **French:** `https://phuduygroup.com/fr/{slug}/`
- **Japanese:** `https://phuduygroup.com/ja/{slug}/`

## Key Capabilities & Technical Specifications
- **No Server Processing:** All operations execute inside the user's browser runtime.
- **Offline / Zero Latency:** No API network overhead.
- **Formats Supported:** JSON, TypeScript, Zod, YAML, XML, CSV, SQL, Markdown, PDF, PNG, JPG, WebP, SVG, MP3, WAV, WebM.