All 252+ Online Developer & AI Utilities
Explore our complete suite of 252+ high-performance developer, AI, SEO, cryptography, math, and finance tools. Zero telemetry, instant in-memory execution.
JSON Formatter, Validator & Tree Viewer
Beautify, validate, minify, inspect AST hierarchies, and fix malformed JSON payloads in real time.
JWT Debugger & Token Signature Inspector
Decode, inspect, and verify JSON Web Tokens (JWT) headers, payloads, claims, and expiration timestamps in real time.
SQL Formatter, Beautifier & Query Optimizer
Format, uppercase keywords, and restructure complex SQL queries for MySQL, PostgreSQL, BigQuery, and SQLite.
RegEx Tester, Debugger & Pattern Matcher
Test, validate, extract match groups, and debug regular expressions with instant real-time highlighting.
UUID, ULID & Cryptographic GUID Generator
Generate cryptographically secure UUID v4, UUID v7 (Time-Ordered), ULID, and GUIDs in bulk.
Base64 & URL-Safe Base64 Encoder / Decoder
Encode and decode standard and URL-safe Base64 strings, binary payloads, and UTF-8 multibyte characters.
HTML, CSS & JavaScript Code Minifier
Minify and compress HTML, CSS, and JS code by stripping comments, whitespace, and redundant tokens.
Crontab Schedule Generator & Human Translator
Build POSIX cron expressions visually, translate syntax into plain English, and view upcoming run times.
cURL to JavaScript Fetch, Python & Go Converter
Instantly convert raw cURL command lines into executable JavaScript Fetch, Node.js, Python Requests, and Go code.
Markdown to Clean HTML Converter & Live Preview
Transform GitHub Flavored Markdown (GFM) into clean, semantic, SEO-ready HTML with code syntax styling.
Word, Character & Reading Time Analyzer
Real-time word count, character count, syllable count, sentence complexity, and estimated reading/speaking time.
Case Converter & URL Slug Generator
Convert text into camelCase, PascalCase, snake_case, kebab-case, Title Case, UPPERCASE, and SEO URL slugs.
Diff & Text Comparison Engine
Compare two code snippets or text blocks side-by-side to highlight added, removed, and modified lines.
AI Prompt Optimizer & LLM Token Cost Estimator
Refine raw prompts into structured few-shot templates and calculate exact token counts and API costs across top LLMs.
Meta Tags, Open Graph & Live SERP Preview Generator
Generate SEO meta tags, Open Graph cards, Twitter cards, and preview live Google and Bing search snippets.
Password Entropy & Brute-Force Time Analyzer
Analyze password strength, calculate Shannon entropy in bits, and estimate time required to crack via GPU clusters.
HEX, RGB, HSL, OKLCH Converter & WCAG Contrast Checker
Convert between HEX, RGB, HSL, and modern OKLCH color spaces, and calculate WCAG 2.2 accessibility contrast ratios.
Scientific Expression & Unit Converter Engine
Evaluate complex scientific math expressions, trigonometry, logarithms, and convert unit systems.
Compound Interest & Investment Growth Calculator
Calculate compound growth, future value, total interest accrued, and periodic contribution projections.
CIDR Subnet Mask & IP Range Calculator
Calculate network address, broadcast address, usable IP range, wildcard mask, and total usable hosts.
QR Code & Digital Barcode Generator
Generate high-resolution custom QR codes for URLs, WiFi credentials, vCards, text, and barcodes.
JSON to TypeScript Interface Generator
Convert raw JSON schemas into strict TypeScript types and interfaces.
JSON to Python Dataclass / Pydantic Converter
Generate type-safe Python dataclasses and Pydantic models from JSON.
YAML to JSON & JSON to YAML Converter
Bidirectional clean conversion between YAML configuration and JSON.
XML to JSON & JSON to XML Converter
Parse XML documents and convert to hierarchical JSON structures.
HTML Entity Encoder & Decoder
Encode and decode special HTML characters and named entities.
URL Parameter Parser & Query Builder
Parse complex URL query parameters into editable JSON structures.
String Escaper & Unescaper (JSON, Java, C#)
Escape and unescape quotes, newlines, and special characters.
Chmod Permissions Calculator
Calculate Linux file permissions in octal (755, 644) and symbolic formats.
Docker Compose YAML Validator
Validate and lint Docker Compose definitions for syntax errors.
Dockerfile Optimizer & Linter
Optimize Dockerfile instructions to minimize image layers and size.
AST Syntax Explorer for JavaScript
Inspect abstract syntax tree node representations of JavaScript code.
Code Screenshot & Snippet Card Maker
Generate beautiful code snippet cards for social media and docs.
Git Command Generator & Cheat Sheet
Generate advanced Git commands for branching, rebasing, and stashing.
HTTP Status Codes Reference & Lookup
Comprehensive dictionary of 1xx, 2xx, 3xx, 4xx, and 5xx HTTP codes.
Bash Script Syntax Checker & Formatter
Format and lint shell and bash scripts for Linux environments.
CSS to SCSS / SASS Converter
Convert standard CSS syntax into nested SCSS format.
SVG Path Optimizer & Clean Engine
Minify SVG path coordinate precision and remove metadata bloat.
Duplicate Line Remover & Deduplicator
Remove duplicate lines from text lists while preserving ordering.
Text Sorter & Alphabetical List Reverser
Sort lists alphabetically, by length, or reverse order.
Lorem Ipsum & Dummy Text Generator
Generate customized placeholder paragraphs, sentences, and words.
Text to Binary & Binary to Text Converter
Convert ASCII text to binary 0s and 1s and decode back to text.
Text to Morse Code & Audio Simulator
Translate text to Morse code dots and dashes with visual timing.
Markdown Table Builder & Generator
Create formatted Markdown tables with column alignments.
Subtitle SRT & VTT Time Shifter
Offset subtitle timestamps forward or backward by milliseconds.
Text Obfuscator & Character Scrambler
Obfuscate email addresses and text to prevent bot scraping.
Invisible & Hidden Character Detector
Find hidden zero-width spaces and non-breaking spaces in text.
NATO Phonetic Alphabet Converter
Translate words into Alfa, Bravo, Charlie phonetic radiotelephony code.
Text Reverser & Flip Upside Down
Reverse characters, words, or flip text upside down for fun.
Text Repeater & Multiplier
Repeat text strings N times with custom separators and line breaks.
Random String & String Array Shuffler
Shuffle lines of text and generate randomized character sequences.
Email & URL Extractor from Text
Extract all valid email addresses and hyperlinks from raw content.
Line Break Remover & Text Joiner
Remove annoying newline breaks from copied PDF text.
Number to Words & Currency Converter
Convert numerical values into spelled-out English words and currency.
Text Frequency & N-Gram Analyzer
Analyze top keyword frequencies, unigrams, bigrams, and trigrams.
Palindrome & Anagram Checker
Check if words or phrases are valid palindromes or anagrams.
Text to Hexadecimal & Hex to Text
Convert text strings to hex byte values and vice versa.
Sentence & Paragraph Counter
Detailed counts of sentences, paragraphs, and reading metrics.
Zalgo Glitch Text Generator
Generate chaotic glitched Zalgo text overlays with custom intensity.
ROT13 & Caesar Cipher Decoder
Encode and decode classic ROT13 and Caesar shift ciphers.
System Prompt Architect for Chatbots
Create structured persona, safety guardrails, and role prompts.
Few-Shot Example Prompt Generator
Build few-shot input/output demonstration pairs for AI models.
Regex to Plain Natural Language Explainer
Translate complex regex expressions into simple English explanations.
AI Hallucination & Consistency Validator
Check prompt instructions for logical contradictions and ambiguities.
Synthetic Data & Mock JSON Generator
Generate realistic synthetic datasets for AI testing and fine-tuning.
Vector Search Cosine Distance Calculator
Calculate cosine similarity and Euclidean distance between embeddings.
Embeddings Dimension & Cost Estimator
Estimate memory requirements and indexing costs for vector databases.
LLM Temperature & Top-P Behavior Simulator
Visualize how sampling parameters impact LLM response randomness.
AI Safety & Toxicity Guardrail Filter
Simulate safety policy checks against prompt injections and jailbreaks.
Chain-of-Thought (CoT) Prompt Builder
Format complex multi-step reasoning instructions for frontier models.
AI Content Paraphraser & Humanizer
Rewrite prompts to enhance clarity, flow, and human resonance.
JSON-LD Schema Builder for AI Search
Create structured knowledge graph schemas for Perplexity and ChatGPT.
Negative Prompt Generator for Image Models
Generate negative prompts for Stable Diffusion, Midjourney, and Flux.
Midjourney & DALL-E Prompt Enhancer
Add cinematic lighting, camera angles, and rendering keywords.
Function Calling JSON Schema Generator
Generate OpenAI and Anthropic compatible tool/function schemas.
AI Agent Memory & Context Window Estimator
Calculate token limits and memory utilization across agent loops.
Prompt Diff & Version Comparison
Track prompt iterations and benchmark token differences over time.
Multilingual Translation Prompt Formatter
Generate high-accuracy localization prompts with cultural context.
RAG Chunk Size & Overlap Calculator
Optimize document chunking parameters for retrieval augmented generation.
AI Sentiment & Emotion Tone Analyzer
Analyze the emotional tone and sentiment polarity of written text.
Perplexity & Search AI Snippet Previewer
Preview how your content appears when summarized by AI search engines.
XML Sitemap Generator & Validator
Generate search engine compliant sitemap.xml files with priority tags.
Robots.txt Generator & Directives Tester
Build robots.txt rules for Googlebot, Bingbot, and AI search bots.
Schema.org JSON-LD Structured Data Builder
Generate Article, Organization, Product, and FAQ JSON-LD schemas.
Canonical URL Tag Generator & Validator
Avoid duplicate content penalties with proper rel=canonical markup.
Hreflang Multi-Language Tag Builder
Create international SEO hreflang tags for multi-regional websites.
Keyword Density & Frequency Checker
Analyze keyword prominence and avoid search engine keyword stuffing.
UTM Campaign URL Builder & Tracker
Generate campaign tracking links with source, medium, and campaign tags.
Nginx & Apache 301 Redirect Generator
Generate server redirect rules for domain migrations and URL updates.
OpenGraph Social Card Image Previewer
Preview how Facebook, LinkedIn, and Discord render your social cards.
Twitter Card / X Summary Card Generator
Create summary_large_image tags optimized for X / Twitter feeds.
Google Search Console Crawl Error Explainer
Understand and fix 404, soft 404, redirect loops, and crawl anomalies.
Geo-Targeting Coordinates to Lat/Long Lookup
Format geographical coordinates for local business SEO schemas.
BreadcrumbList Schema.org Generator
Create structured breadcrumb navigation schemas for rich SERP snippets.
FAQ Schema Markup Generator
Build interactive FAQPage JSON-LD schemas to win rich snippet accordions.
LocalBusiness Schema Builder with GeoCoordinates
Generate complete local business schemas with opening hours and geo data.
HTTP Security Headers Analyzer (CSP, HSTS)
Generate recommended Content-Security-Policy and HSTS headers.
AI Search Citation & GEO Optimizer
Audit content structure for Perplexity and Google AI Overview citations.
Site Speed TTFB & Core Web Vitals Estimator
Understand LCP, FID, INP, and CLS performance metrics.
Structured Data Rich Results Linter
Validate JSON-LD against Google's official Rich Results guidelines.
Bing Webmaster URL Submission Helper
Format bulk URL lists for instant submission to Bing IndexNow API.
Meta Robots Directives Builder (noindex, nofollow)
Create fine-grained robot meta directives for private pages.
Favicon Link Tag Generator
Generate all HTML link tags for apple-touch-icon, favicon.ico, and SVG icons.
Google Search Snippet Pixel Width Calculator
Calculate exact pixel width to prevent title truncation in Google SERPs.
SHA-256 / SHA-512 Hash Checksum Generator
Calculate cryptographic SHA-256 and SHA-512 hashes for text and files.
MD5 & SHA-1 Hash Generator (Legacy Checksum)
Generate MD5 and SHA-1 checksums for legacy file validation.
HMAC Signature Generator (SHA-256 / SHA-512)
Calculate keyed-hash message authentication codes (HMAC).
AES-GCM 256-Bit Encryptor & Decryptor
Client-side authenticated symmetric encryption with 256-bit keys.
RSA 2048/4096-Bit Public & Private Key Generator
Generate PEM-encoded RSA key pairs in your browser via WebCrypto.
Secure Passphrase Generator (Diceware CSPRNG)
Generate memorable, high-entropy multi-word Diceware passphrases.
Bcrypt Hash Cost & Salt Simulator
Calculate Bcrypt work factor iterations and salt configurations.
SSL / TLS Certificate CSR Decoder
Inspect and decode Certificate Signing Requests (CSR) and X.509 certs.
Random Hex & Base64 Secret Key Generator
Generate 128-bit, 256-bit, and 512-bit cryptographically random keys.
Content Security Policy (CSP) Builder
Build strict Content-Security-Policy directives to eliminate XSS risks.
Subresource Integrity (SRI) Hash Generator
Generate sha384 and sha512 integrity attributes for CDN scripts.
Bcrypt / Argon2 Entropy Comparison
Compare memory and CPU resistance against GPU cracking attacks.
Port Number Lookup & Protocol Reference
Search common and registered TCP/UDP port numbers and vulnerabilities.
Private IP Range & Bogon IP Filter
Identify RFC 1918 private IP addresses and loopback ranges.
File Checksum Verifier (SHA-256)
Compute and verify cryptographic SHA-256 checksums of local files.
HTPasswd Password Hash Generator
Generate Apache htpasswd compatible MD5, SHA1, and Bcrypt hashes.
OTP / TOTP Secret Key & QR Code Builder
Generate 2FA TOTP authenticator secrets and QR code URIs.
DNSSEC Record Validator & Key Visualizer
Understand DS, DNSKEY, and RRSIG records in DNSSEC security.
Credit Card Luhn Algorithm Validator
Test numerical validity of payment card numbers via Luhn formula.
CSS Glassmorphism Generator
Create modern frosted glass UI components with backdrop-filter blur.
CSS Neumorphism & Soft UI Generator
Build extruded soft neumorphic buttons, cards, and inset shadows.
CSS Box Shadow & Layered Glow Studio
Generate ultra-smooth multi-layered box shadows and glowing borders.
Mesh & Multi-Stop CSS Gradient Studio
Design vibrant multi-stop linear, radial, and conic gradients.
OKLCH & HSL Color Palette Harmony Maker
Generate complementary, triadic, and analogous color palettes in OKLCH.
CSS Clip-Path Shape Maker
Create geometric clip-path polygons, triangles, circles, and stars.
CSS Border-Radius & Blob Morphism Generator
Create organic blob shapes using 8-value border-radius syntax.
Fluid Typography Clamp() Calculator
Calculate responsive font sizes using CSS clamp(min, preferred, max).
Aspect Ratio & Screen Dimension Calculator
Calculate 16:9, 4:3, 21:9 aspect ratios and scale dimensions.
Image to Base64 Data URI Converter
Convert small PNG, JPEG, and SVG images into inline Base64 data URIs.
SVG to Clean Data URI / CSS Background
Convert raw SVG code into URL-encoded CSS background-image strings.
CSS Animation & Keyframe Studio
Design smooth CSS keyframe animations with custom cubic-bezier easing.
Color Blindness Simulator (Protanopia, Deuteranopia)
Simulate how UI color palettes appear across all color vision deficiencies.
RGB to CMYK Print Color Converter
Convert digital screen RGB values into print-ready CMYK percentages.
HEX to Android / Flutter Color Code
Convert HEX colors to 0xFF format for Flutter and XML Android layouts.
Font Pairing & Visual Typography Previewer
Preview Google Font pairings (Headings + Body) with live text controls.
CSS Triangle & Arrow Generator
Generate pure CSS border triangles and tooltip arrow pointers.
Favicon Generator & App Icon Sizer
Resize images into standard 16x16, 32x32, 180x180, and 512x512 icons.
CSS Grid Layout Generator
Visually build CSS grid template columns, rows, and gap layouts.
CSS Flexbox Playground & Alignment Guide
Experiment with flex-direction, justify-content, and align-items.
Dark / Light Theme Color Contrast Matrix
Audit background and text contrast pairs across entire design systems.
SVG Gradient & Pattern Generator
Generate reusable SVG gradient defs and repeating vector patterns.
Golden Ratio & Fibonacci Scale Calculator
Calculate layout spacing and typography scales using the Golden Ratio.
Image Pixel Dimensions & DPI Calculator
Calculate print dimensions in inches and centimeters from DPI and pixels.
Epoch Unix Timestamp Converter & Formatter
Convert Unix epoch timestamps (seconds/ms) to human dates and ISO 8601.
Base Number Converter (Binary, Octal, Decimal, Hex)
Convert numbers between any radix base from Base-2 up to Base-36.
Unit Converter (Length, Weight, Temp, Speed, Area)
Convert between metric and imperial measurement systems seamlessly.
Data Storage & Bandwidth Transfer Converter
Convert KB, MB, GB, TB, and calculate file download times across speeds.
Percentage, Increase & Discount Calculator
Calculate percentage differences, markups, margins, and sales discounts.
Matrix Math Calculator (Multiply, Transpose, Det)
Perform 2x2, 3x3 matrix multiplication, determinants, and inversion.
Prime Number Factorizer & Sieve Tester
Find prime factors of numbers and test primality via sieve algorithms.
Statistics Engine (Mean, Median, Mode, Std Dev)
Calculate descriptive statistics, variance, and standard deviation.
Quadratic & Linear Equation Solver
Solve polynomials ax² + bx + c = 0 with real and complex roots.
Roman Numerals to Arabic & Arabic to Roman
Convert ancient Roman numerals to modern decimal numbers and back.
Geometry & 3D Volume Area Solver
Calculate perimeter, surface area, and volume for spheres, cylinders, cones.
Trigonometry Functions (Sin, Cos, Tan, Rad/Deg)
Calculate trigonometric values in radians, degrees, and gradians.
Logarithm & Exponential Calculator (log10, ln, log2)
Calculate natural logs, binary logs, and exponential powers.
Greatest Common Divisor (GCD) & LCM Finder
Calculate GCD and LCM for multiple integers via Euclidean algorithm.
Date & Time Duration Difference Calculator
Calculate exact days, hours, minutes, and workdays between two dates.
Age Calculator & Milestone Timeline
Calculate exact age in years, months, days, hours, and next birthday.
Random Number & Gaussian Distribution Generator
Generate random numbers from uniform or Gaussian normal distributions.
Speed, Distance & Travel Time Calculator
Calculate speed, distance, or travel duration for transit and racing.
Bitwise Operations Visualizer (AND, OR, XOR, NOT)
Visualize 32-bit binary bitwise operations with interactive bit toggles.
Fractions Simplifier & Mixed Fraction Arithmetic
Add, subtract, multiply, and reduce fractions to simplest form.
Standard Deviation & Z-Score Calculator
Compute population and sample standard deviation and normal z-scores.
Temperature Converter (Celsius, Fahrenheit, Kelvin)
Convert temperature values across Celsius, Fahrenheit, Kelvin, and Rankine.
Fuel Consumption & Mileage Calculator (MPG, L/100km)
Calculate fuel economy, trip cost, and mileage conversions.
Loan & Mortgage Monthly EMI Calculator
Calculate monthly payments, total interest, and loan amortization schedule.
Crypto Profit / Loss & DCA Growth Calculator
Calculate crypto investment returns, Dollar Cost Averaging (DCA), and profit.
Freelance Hourly Rate & Project Estimator
Calculate ideal hourly billing rates based on expenses, taxes, and target profit.
ROI & Return on Investment Calculator
Calculate Net ROI, annualized returns, and capital gain percentages.
Break-Even Point & Margin of Safety Calculator
Find fixed cost break-even unit sales volume and revenue targets.
Salary Tax & Take-Home Pay Estimator
Estimate net salary take-home pay after taxes and standard deductions.
Net Present Value (NPV) & IRR Calculator
Calculate NPV and internal rate of return for multi-year cash flows.
Sales Tax & Value Added Tax (VAT) Calculator
Calculate gross and net prices with sales tax and VAT rates.
Discount, Sale Price & Savings Calculator
Calculate final discounted prices and total dollar savings during sales.
Tip & Split Bill Calculator with Rounding
Calculate restaurant tip amounts and split totals evenly across guests.
401(k) & Retirement Growth Planner
Plan retirement savings with employer matching contributions and growth.
Inflation & Purchasing Power Calculator
Calculate historical and future inflation impact on purchasing power.
Gross Profit Margin & Markup Calculator
Calculate gross profit margins, markups, and cost of goods sold.
Auto Loan & Vehicle Lease Calculator
Compare buying vs leasing a vehicle with interest rates and depreciation.
Stock Dividend Yield & Reinvestment (DRIP) Calc
Calculate annual dividend yields and compounded DRIP growth.
Capital Gains Tax Calculator
Estimate short-term vs long-term capital gains taxes on asset sales.
Customer Lifetime Value (LTV) & CAC Ratio Calc
Calculate SaaS customer lifetime value and CAC payback periods.
Monthly Budget & 50/30/20 Rule Planner
Organize income into Needs (50%), Wants (30%), and Savings (20%).
Credit Card Minimum Payment Payoff Planner
See how long credit card balances take to pay off with interest.
IPv4 to IPv6 & IPv6 to IPv4 Converter
Convert IPv4 addresses to IPv6 6to4, IPv4-mapped, and hex formats.
User-Agent Header Parser & Device Inspector
Parse browser, operating system, device family, and bot identities.
DNS Record Type Reference & Query Builder
Lookup A, AAAA, CNAME, MX, TXT, NS, SOA, and SRV record formats.
WebSocket Test Frame & Payload Generator
Format JSON and binary WebSocket ping/pong and text data frames.
HTTP Header Generator & CORS Configurator
Build CORS Access-Control-Allow-Origin headers and preflight rules.
MIME Type Lookup & File Extension Reference
Search over 1,000 standard IANA MIME types by file extension.
Bandwidth & Download Time Calculator
Calculate transfer times for files across 5G, Fiber, Wi-Fi, and 4G.
MAC Address Formatter & Vendor OUI Lookup
Format MAC addresses in colon, hyphen, or dot notations.
IP Geolocation Coordinates Simulator
Understand how IP addresses map to autonomous system numbers (ASN).
Ping Latency & Network Jitter Calculator
Calculate round-trip time (RTT), packet loss impact, and bufferbloat.
Kubernetes Resource YAML Generator (Pods, Services)
Generate clean K8s deployment, service, and ingress YAML definitions.
AWS S3 Bucket Policy & IAM JSON Builder
Build secure Amazon S3 bucket policies with least-privilege rules.
Nginx Reverse Proxy Config Generator
Generate production-grade Nginx reverse proxy blocks with SSL.
Apache .htaccess Security Rules Generator
Generate .htaccess rules for HTTPS redirection, hotlink protection.
TCP Three-Way Handshake Visualizer
Interactive guide to SYN, SYN-ACK, and ACK network state transitions.
SSL Cipher Suite Security Evaluator
Review TLS 1.2 and TLS 1.3 cipher suites for forward secrecy.
SSH Key Fingerprint & Format Converter
Convert OpenSSH public keys into RFC 4716 and PKCS#8 formats.
JSON Web Key (JWK) & JWKS Generator
Create JWKS endpoints and public key sets for OAuth 2.0 authorization.
Cloud Cost & Virtual Machine Sizer
Compare cloud compute instances across AWS, GCP, and Azure.
Pomodoro Focus Timer & Task Flow
Customizable 25/5 focus and break timer with audio notifications.
Decision Wheel & Random Item Picker
Spin a customizable decision wheel to randomly pick options or names.
Stopwatch & Split Lap Time Tracker
Millisecond-precision online stopwatch with split lap recording.
Countdown Timer to Any Future Event / Date
Live animated countdown timer to product launches, holidays, or events.
Calorie, BMR & Macro Nutrition Calculator
Calculate Basal Metabolic Rate (BMR) and daily protein/carb/fat targets.
Typing Speed Test & WPM Tracker
Test words-per-minute (WPM) typing speed with accuracy tracking.
Habit Streak & Consistency Tracker
Calculate habit formation milestones and visualize streak statistics.
Daily Planner & Time-Blocking Sheet Maker
Build printable daily schedules using 30-minute time-blocking grids.
Scratchpad & Persistent Local Notes
Fast auto-saving notepad stored securely in your browser's localStorage.
Random Password & PIN Code Generator
Generate random 4-digit, 6-digit PIN codes or complex 32-char passwords.
World Clock & Global Meeting Planner
Compare time zones across London, New York, Tokyo, and Sydney.
Water Intake & Hydration Calculator
Calculate recommended daily water intake based on body weight.
Unit Price & Best Value Deal Comparator
Compare prices per ounce or gram across different store packaging.
Event Budget & Expense Splitter
Track group expenses, calculate who owes whom, and settle balances.
Flashcard & Spaced Repetition Study Engine
Create digital study cards with spaced repetition intervals.
Morse Code Audio & Visual Transmitter
Play audible Morse code tones and flash visual beacon signals.
Barcode EAN-13 & UPC-A Generator
Generate standard retail barcode SVGs with checksum validation.
CBOR Hex Decoder, Encoder & Inspector
Decode Concise Binary Object Representation (CBOR) hex strings into readable JSON and encode JSON to CBOR hex.
Ed25519 Keypair Generator & Signature Tester
Generate Ed25519 Edwards-curve keypairs, sign arbitrary payloads, and cryptographically verify digital signatures.
Cron Expression Parser, Explainer & Next Runs Calculator
Parse Unix Crontab expressions into plain English explanations and calculate the exact next 5 execution timestamps.
cURL Command to Fetch, Python, Go & Rust Code Converter
Convert raw terminal cURL commands into clean JavaScript Fetch, Python Requests, Go http.NewRequest, and Rust Reqwest.
Docker Run to Docker Compose YAML Converter
Translate complex terminal docker run commands into clean, reproducible docker-compose.yml YAML specifications.
Protocol Buffers (Protobuf v3) to JSON Schema & TypeScript
Convert Protocol Buffers (.proto) message definitions into JSON Schema (Draft 2020-12) and TypeScript interfaces.
HTML5 Named & Numeric Entity Encoder / Decoder
Encode special characters to HTML5 entities (&, <, >, ") or decode entities back to plain text.
Base58 (Bitcoin & IPFS) Encoder & Decoder
Encode strings and binary hex to Base58 and Base58Check or decode Bitcoin addresses and IPFS multihashes.
BIP-39 Mnemonic Seed Phrase & Entropy Generator
Generate 12-word and 24-word cryptographically secure BIP-39 mnemonic seed recovery phrases with SHA-256 checksums.
Vector Embeddings Cosine Similarity & Distance Calculator
Compute Cosine Similarity, Dot Product, and Euclidean L2 distance between multi-dimensional vector embeddings.
Enterprise LLM System Prompt & Persona Architect
Compose structured, role-based system prompts with Chain-of-Thought directives, XML tags, guardrails, and JSON output constraints.
RAG Semantic Document Chunk Splitter & Token Estimator
Split long documents into semantic sliding-window overlapping chunks and calculate vector token counts and chunk statistics.
Robots.txt Rule Tester & Crawler Permission Validator
Test user-agents (Googlebot, Bingbot, GPTBot, ClaudeBot) against robots.txt directives and verify page crawl permissions.
HTTP Security Headers & CSP Level 3 Policy Builder
Generate hardened HTTP security headers: Content-Security-Policy (CSP Level 3), HSTS, Permissions-Policy, and X-Frame-Options.
UTM Campaign URL Builder & Link Tagging Studio
Generate tracking-ready URLs with utm_source, utm_medium, utm_campaign, utm_term, and utm_content parameters.
MAC Address OUI Vendor Lookup & Format Normalizer
Validate 48-bit MAC addresses, identify IEEE Organizationally Unique Identifier (OUI) vendors, and convert between colon, hyphen, and dot formats.
DNS SPF & DMARC Email Security Record Builder
Generate RFC-compliant DNS TXT records for SPF (Sender Policy Framework) and DMARC email spoofing protection.
HTTP Status Code Diagnostic Lookup & Troubleshooting Guide
Comprehensive RFC 9110 HTTP status code encyclopedia with cacheability rules, REST semantics, and root-cause fix procedures.
Tailwind CSS Utility to Vanilla CSS Transpiler
Transpile Tailwind CSS utility classes into clean, standard Vanilla CSS declarations.
Cubic Bézier CSS Animation Easing Generator
Generate cubic-bezier(x1, y1, x2, y2) timing functions with velocity curves, CSS transition rules, and SVG curve previews.
CSS Glassmorphism & Backdrop-Filter Generator
Generate cross-browser frosted glass effects using backdrop-filter blur, OKLCH translucent tints, and subtle borders.
Monte Carlo Investment Portfolio Risk Simulator
Run stochastic Monte Carlo simulations over investment portfolios with expected return, volatility, and percentile distributions.
Historical & Future Inflation Purchasing Power Calculator
Calculate the real purchasing power loss of cash over time and determine future required capital adjusted for compound inflation.
Matrix Determinant, Inverse & Multiplication Calculator
Compute determinants, matrix multiplication (A × B), matrix inverses (A⁻¹), transpose, and trace for 2×2 and 3×3 matrices.
Shannon Entropy & String Randomness Analyzer
Compute exact Shannon entropy in bits per character, character frequency distributions, and metric entropy ratios.
UUIDv7 Time-Sortable Identifier Generator & Inspector
Generate RFC 9562 UUIDv7 sortable identifiers with millisecond Unix epoch timestamps, batch generation, and binary inspection.
Pomodoro Interval Focus & Productivity Timer
Structured 25-minute deep work intervals with 5-minute short breaks, 15-minute long breaks, and daily completion logs.