97+ tools. Pick one. Get it done.
Popular
Most-used tools, picked across categories
JSON Formatter
Format, validate & minify JSON in your browser
QR Code Generator
Create QR codes for URLs, text, WiFi or anything
Password Generator
Strong, random passwords — generated in your browser
Percentage Calculator
Calculate percentages, increases, decreases & more
Word Counter
Count words, characters, sentences & reading time instantly
Image Compressor
Reduce image file size without losing quality
Base64 Encoder / Decoder
Encode or decode Base64 instantly
5 tools
Image
5 tools
QR Code Generator
Create QR codes for URLs, text, WiFi or anything
Image Compressor
Reduce image file size without losing quality
Image Resizer
Resize images by pixels or percentage
Image Format Converter
Convert between JPG, PNG, WebP, AVIF
Image Cropper
Crop images to any aspect ratio
Developer
22 tools
JSON Formatter
Format, validate & minify JSON in your browser
Regex Tester
Test regular expressions in real-time
Base64 Encoder / Decoder
Encode or decode Base64 instantly
JWT Decoder
Decode JSON Web Tokens — 100% client-side
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
URL Encoder / Decoder
Encode or decode URL-safe strings instantly
UUID Generator
Generate v4 UUIDs — cryptographically random
Unix Timestamp Converter
Convert between Unix timestamps and human dates
Color Picker & Converter
Pick colors and convert HEX ↔ RGB ↔ HSL
Markdown Editor
Write Markdown with live HTML preview
SQL Formatter
Format and beautify SQL queries
CSS Gradient Generator
Design linear and radial CSS gradients visually
AI Text Detector
Detect AI-generated text with rule-based heuristics
AI Token Counter
Count tokens for GPT-4, Claude, Gemini — with cost estimates
Tiktoken Visualizer
See your text tokenized — colorful, instant, for GPT/Claude/Gemini
Multi-Model AI Comparator
Compare GPT-4, Claude, Gemini — tokens + costs side-by-side
PII Scrubber
Remove personal info before sending text to AI
API Key Leak Detector
Scan text or files for leaked API keys — 20+ providers
ChatGPT Export Viewer
View and search ChatGPT/Claude conversation exports
Regex Explainer
Explain any regular expression in plain English
Password Breach Checker
Check if your password has been in a data breach
AI Hallucination Checker
Flag likely hallucinations in AI-generated text
Calculator
55 tools
Percentage Calculator
Calculate percentages, increases, decreases & more
Age Calculator
Calculate exact age in years, months, days, hours
BMI Calculator
Body Mass Index — metric and imperial
Loan Calculator
Monthly payments, total interest & amortization
Currency Converter
Live exchange rates for 170+ currencies
Tip Calculator
Calculate tips and split bills between people
Temperature Converter
Celsius ↔ Fahrenheit ↔ Kelvin — instant
Length Converter
Meters, feet, inches, kilometers, miles and more
Weight Converter
Kilograms ↔ pounds ↔ ounces ↔ grams
Countdown Timer
Count down to any date or time — live
Calorie Calculator (TDEE)
Daily calorie needs using Mifflin-St Jeor formula
AI Team Cost Calculator
Estimate monthly AI API costs for teams of any size
Compound Interest Calculator
See how money grows over time — with monthly contributions
Paycheck Calculator
Net salary after taxes — Germany, USA, UK
Crypto Tax Calculator
Calculate crypto capital gains — FIFO or LIFO
Mortgage Stress Test
Can you still afford your mortgage if rates rise?
Solar Panel ROI Calculator
Payback period + lifetime savings of solar panels
EV vs Gas Cost Calculator
Compare 5-year total cost: electric vs gasoline car
Carbon Footprint Calculator
Estimate your annual CO2 emissions
Intermittent Fasting Timer
Track 16:8, 18:6, OMAD, 5:2 — all protocols
Macro Calculator
Protein, carbs, fat for your fitness goal
A/B Test Significance Calculator
Is your A/B test result statistically significant?
Decision Matrix
Weighted pros/cons for hard decisions
Timezone Meeting Finder
Find a time that works for global teams
Schengen 90/180 Calculator
Track Schengen Area stays for digital nomads
Scientific Calculator
Full scientific calculator — trig, log, exp, memory
Area Calculator (All Shapes)
Area of rectangle, circle, triangle, polygon + more
Cooking Conversion Calculator
Cups to ml to tbsp to oz — all cooking units
Pool Volume Calculator
Gallons or liters for any pool shape
Pythagorean Theorem Calculator
a squared plus b squared equals c squared
Circle Calculator
Radius, diameter, circumference, area from any input
Fraction Calculator
Add, subtract, multiply, divide fractions
Roman Numerals Converter
Convert numbers to Roman and back
Dog Age Calculator
Convert dog age to human years (breed-aware)
Running Pace Calculator
Pace, time, distance — all three connected
Concrete Volume Calculator
Cubic yards or meters plus bags of cement
Paint Calculator
Gallons or liters needed for any room
BTU Calculator (AC Heater Sizing)
AC or heater BTU needed for any room
Gross Margin Calculator
Revenue minus COGS over Revenue — business margin
CAGR Calculator
Compound Annual Growth Rate — investments and revenue
Wire Size AWG Calculator
AWG size for any current, distance, voltage drop
Voltage Drop Calculator
Voltage loss over wire length
Ohms Law Calculator
V = I times R — solve for any of the three
Fuel Economy Calculator
MPG, L per 100km, km per L + trip cost
Tire Size Calculator
Compare two tire sizes — diameter, speedo error
Periodic Table Interactive
Click any element — atomic data, properties, uses
Molar Mass Calculator
Molecular weight from any chemical formula
Chemical Equation Balancer
Auto-balance any chemical reaction
Volume Calculator (3D Shapes)
Cube, cylinder, sphere, cone, pyramid, prism
Trigonometry Calculator
sin, cos, tan + inverse functions
Pregnancy Due Date Calculator
Due date + week-by-week trimester
Quadratic Equation Solver
Solve ax squared + bx + c = 0
Right Triangle Solver
All sides and angles from any 2 inputs
Standard Deviation Calculator
sigma, variance, mean, median for any dataset
ABV Calculator (Brewing)
Alcohol by volume from OG and FG readings
Text
10 tools
Word Counter
Count words, characters, sentences & reading time instantly
Case Converter
UPPERCASE, lowercase, Title Case, camelCase & more
Password Generator
Strong, random passwords — generated in your browser
Lorem Ipsum Generator
Placeholder text in words, sentences or paragraphs
Text Diff Checker
Compare two texts and highlight the differences
Reverse Text
Reverse characters, words, or flip lines upside-down
URL Slug Generator
Convert titles to SEO-friendly URL slugs
AI Output Humanizer
Make AI-written text sound more human — rule-based, instant
Prompt Enhancer
Transform basic prompts into structured, high-quality prompts
Prompt Library
60+ curated AI prompt templates — ready to copy