Free Online Tools
Simple, fast, and free tools for everyday tasks. No signup required.
BMI Calculator
Calculate your Body Mass Index and find your healthy weight range
Mortgage Calculator
Calculate monthly payments, total interest, and amortization schedule
Investment Calculator
Compound interest calculator with DCA simulation and growth projection
US Income Tax Calculator
Estimate 2025 US federal income tax, take-home pay, and effective and marginal rates
China Income Tax Calculator
Estimate China individual income tax (IIT) on comprehensive income, monthly and annually
Taiwan Income Tax Calculator
Estimate Taiwan consolidated income tax with exemptions and the salary special deduction
Hong Kong Salaries Tax Calculator
Estimate Hong Kong salaries tax — the lower of progressive and two-tiered standard rates
Timezone Converter
Convert time between timezones with meeting planner
Sleep Calculator
Find the best time to sleep or wake up based on sleep cycles
Currency Converter
Convert between 150+ currencies with real-time exchange rates
IP Address Lookup
Find your IP address, location, ISP, and more
Image Compressor
Compress images in your browser — JPEG, PNG, WebP supported
Percentage Calculator
Calculate percentages easily — find percentage of a number, percentage change, and more
QR Code Generator
Generate QR codes for URLs, text, Wi-Fi, and more — download as PNG or SVG
Invoice Generator
Create professional invoices with line items, taxes, and PDF export
Password Generator
Generate strong, secure passwords with customizable length and character options
JSON Formatter
Format, validate, and minify JSON data with syntax highlighting
JSON / YAML / TOML Converter
Convert between JSON, YAML, and TOML — validate, format, minify, and download in your browser
Color Scheme Generator
Generate harmonious color palettes — complementary, triadic, analogous, and more
Linux Commands Cheat Sheet
Quick reference for essential Linux commands — files, permissions, networking, and more
Git Cheat Sheet
Quick reference for Git commands — branching, merging, rebasing, and workflows
Docker Cheat Sheet
Quick reference for Docker commands — containers, images, volumes, and compose
Tmux Cheat Sheet
Quick reference for Tmux — sessions, windows, panes, and key bindings
Claude Code Cheat Sheet
Quick reference for Claude Code CLI — slash commands, skills, MCP, and session management
Codex CLI Cheat Sheet
Quick reference for OpenAI Codex CLI — sandbox modes, approvals, exec, and git workflows
Gemini CLI Cheat Sheet
Quick reference for Google Gemini CLI — checkpoints, MCP, custom commands, and extensions
Hangman Game
Guess the hidden word letter by letter — a classic word guessing game to improve your English vocabulary
Word Guessing Game
Guess the 5-letter word in 6 tries — green means correct position, yellow means wrong position
Word Scramble
Unscramble the letters to form the correct English word — test your vocabulary and spelling skills
Word Search
Find hidden English words in the letter grid — drag to select words horizontally, vertically, or diagonally
Memory Match
Flip cards to match English words with their definitions — train vocabulary and memory
Fill in the Blanks
Complete English sentences by choosing the correct missing word — build vocabulary in context
Letter Grid Finder
Find words hidden in a grid of letters — connect adjacent letters to form English words, Boggle-style
Mini Crossword
Solve themed crossword puzzles — fill in words from clues to improve vocabulary and spelling
Free AI Models & Tokens
Directory of free AI models, GPU computing, and API tokens — use top LLMs without paying