All Tools
48 free tools — all running 100% in your browser.
Base64 Encoder & Decoder
Encode text to Base64, or decode Base64 back to plain text. Supports full UTF-8.
Color Picker
Pick colors and convert between HEX, RGB, HSL, CMYK. Check WCAG contrast ratios.
Compound Interest Calculator
Calculate compound interest growth and compare it with simple interest and total contributions.
FIRE Calculator (Financial Independence, Retire Early)
Calculate your path to financial independence with the 4% rule, portfolio projections, and withdrawal planning.
JSON Formatter & Validator
Format, validate, and minify JSON data instantly.
JSON to CSV Converter
Convert JSON arrays to CSV format with one click. Supports nested objects.
Life Progress Bar — 4000 Weeks
Visualize how much of your life has passed with the 4000 Weeks grid. Enter your age and see your weeks.
Password Generator
Generate secure passwords with crypto.getRandomValues(). Length slider, character sets, entropy meter.
QR Code Generator
Generate QR codes for URLs, text, emails, phone numbers, and WiFi credentials. Download as PNG.
Regex Tester
Test regular expressions in real-time with match highlighting and capture group display.
UUID v4 Generator
Generate random UUIDs (v4) in bulk with one click.
Weather Widget
Real-time weather conditions with temperature, humidity, wind speed, and precipitation.
Age Calculator
Calculate exact age in years, months, days, hours, and minutes from any date.
Air Quality Monitor (PM2.5)
Real-time air quality index (AQI) and PM2.5 levels for your location.
App Logo Generator (iOS & Android)
Generate all required icon sizes and formats for iOS and Android mobile applications.
Aspect Ratio Calculator
Calculate and convert aspect ratios for images, video, and responsive design.
Background Remover
Remove backgrounds from images automatically using AI. 100% client-side processing.
BMI Calculator
Calculate your Body Mass Index (BMI) with both metric and imperial units.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.
Cron Expression Parser
Parse and explain cron expressions in plain English. See the next scheduled run times.
CSS Box Shadow Generator
Create CSS box shadows visually with sliders for offset, blur, spread, and color.
CSS Gradient Generator
Create beautiful CSS linear and radial gradients with a visual editor and copy the code.
CSS Unit Converter
Convert between px, rem, em, pt, and other CSS units with a configurable base font size.
Date Difference Calculator
Calculate the exact difference between two dates in years, months, days, weeks, hours, and more.
Discount Calculator
Calculate sale prices, savings, and discount percentages for any amount.
Favicon Generator
Convert any image into standard web favicons (16x16, 32x32, 180x180, etc).
Hash Generator
Generate MD5, SHA-1, and SHA-256 hashes from any text using your browser's built-in crypto.
HTML Entity Encoder & Decoder
Encode special characters to HTML entities or decode entities back to text.
Image Compressor & Resizer
Compress and resize images with before/after comparison. Reduce file size while maintaining quality.
Image to Base64 Converter
Convert images to Base64 data URLs for embedding directly in HTML or CSS.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) — view header, payload, and expiration.
Loan Calculator
Calculate monthly payments, total interest, and amortization for any loan.
Lorem Ipsum Generator
Generate lorem ipsum placeholder text by paragraphs, sentences, or words.
Markdown File Preview
Upload a .md file and instantly preview it as formatted HTML.
Markdown Preview
Write Markdown and see a live HTML preview side-by-side.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases instantly.
Online Clock
Real-time digital clock with 12/24 hour format toggle and date display.
PDF to Markdown Converter
Extract text from PDF files and convert to clean Markdown format.
Percentage Calculator
Calculate percentages: what is X% of Y, X is what % of Y, and percentage change.
Pomodoro Timer
A simple Pomodoro technique timer — 25 min work, 5 min break. Customizable intervals.
Sakura Bloom Forecast
Interactive Japan map showing cherry blossom bloom forecasts across all regions.
Text Diff Checker
Compare two texts side-by-side and highlight the differences between them.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports UTC and local time.
Tip Calculator
Calculate tips and split bills between any number of people.
Unit Price Calculator
Compare products by unit price (e.g. per oz, per ml) to find the best value.
URL Encoder & Decoder
Encode or decode URL components and query strings.
URL Slug Generator
Convert titles and text into clean, SEO-friendly URL slugs.
Word Counter & Text Analyzer
Count words, characters, sentences, and paragraphs. Estimate reading and speaking time.