All Tools
Browse all tools organized by category.
Calculators
Percentage Calculator
Calculate percentages, percentage change, and more.
Age Calculator
Find your exact age and compare ages between two people.
BMI Calculator
Calculate your Body Mass Index with metric or imperial units.
Tip Calculator
Calculate tips and split bills easily.
Date Calculator
Calculate days, weeks, and months between two dates.
Loan Calculator
Monthly payment, total interest, and amortization schedule.
Discount Calculator
Find sale prices, savings, and original prices instantly.
Unit Converter
Convert length, weight, temperature, volume, speed, and more.
GPA & Grade Calculator
Calculate semester GPA from course credits and letter grades.
Scientific Calculator
Calculate expressions, powers, roots, and common functions locally.
Color Contrast Checker
Check WCAG contrast ratios for text and backgrounds.
Aspect Ratio Calculator
Solve missing width or height for common aspect ratios.
Finance
Compound Growth
See how investments grow with compound interest over time.
Net Worth Calculator
Track assets and liabilities to calculate your net worth.
Retirement Calculator
Project your retirement savings and see if you're on track.
Mortgage Affordability
Find out how much home you can afford based on income.
Mortgage Payoff
See how extra payments reduce interest and payoff time.
Salary Calculator
Calculate take-home pay after federal, state, and local taxes.
Generators
Printable Generator
Create lined, graph, dotted, planner, and other printable PDFs — free, private, browser-only.
QR Code Generator
Generate downloadable QR codes from text, URL, WiFi, and more.
Password Generator
Generate random secure passwords with customizable options.
UUID / ULID Generator
Generate cryptographically secure UUIDs and ULIDs in bulk.
Hash Generator
Compute SHA-256, SHA-512, and other hashes for text or files.
Logo Creator
Create simple logos with custom text, fonts, shapes, and colors.
ASCII Art Generator
Convert text to figlet banners or images to character art. 14 fonts.
Random Number Generator
Generate secure random integers with optional unique values.
Image Tools
Developer Tools
JSON Formatter
Format, validate, and syntax-highlight JSON instantly.
Color Converter
Convert between HEX, RGB, and HSL with a live color picker.
Regex Tester
Test regex patterns with live highlighting and match details.
Markdown Previewer
Write Markdown and see a live rendered preview side by side.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings. Supports UTF-8.
URL Encoder / Decoder
Percent-encode URLs and query strings, or decode them back.
Text Case Converter
Convert text to camelCase, snake_case, UPPER, Title Case, and more.
Timestamp Converter
Convert Unix timestamps to dates and back. Live clock included.
Time Zone Converter
Schedule across time zones. Find meeting windows with a live heatmap.
JWT Decoder
Decode JWT headers and payload claims locally without verification.
Text Diff Checker
Compare two text blocks line by line in your browser.
HTML Entity Encoder
Encode or decode HTML entities and escaped characters.
Number Base Converter
Convert binary, octal, decimal, and hexadecimal integers.
URL Parser
Inspect URL protocol, host, path, query, and hash parts.
Cron Expression Builder
Build and explain common five-field cron schedules.
CSS Gradient Generator
Create linear, radial, and conic gradients with CSS output.
HTTP Status Code Reference
Search common HTTP response codes and practical meanings.
MIME Type Lookup
Find common MIME types by file extension.
Chmod Calculator
Convert Unix numeric permissions to symbolic notation.
JSON Diff Checker
Compare JSON documents structurally and show changes.
JSON to CSV Converter
Convert arrays of JSON objects into CSV locally.
CSV to JSON Converter
Convert header-based CSV data into JSON objects.
CSS Unit Converter
Convert px, rem, em, and pt values with a clear root-size assumption.
SVG Previewer
Preview SVG markup locally with a safe-input warning.
Color Palette Generator
Generate a tonal palette from a base color.
Slug Generator
Convert titles into clean URL-friendly slugs.
.gitignore Generator
Create a starter .gitignore for common project files.
Meta Tag Generator
Generate basic SEO, Open Graph, and Twitter tags.
Open Graph Preview
Preview a simple social share card locally.
Python Dictionary Linter
Check Python dictionary literals for common syntax mistakes locally.