ultraquick.tools

120 free tools · AI-ready API

Free Online Tools

120 free online tools — calculators, converters, and generators. Fast, private, no sign-up. Every tool has a free JSON API for AI agents.

Time

Age Calculator

Calculate exact age in years, months, days from a birth date.

Date Difference Calculator

Calculate the number of days, weeks, and months between two dates.

Time Zone Converter

Convert a date and time between any two time zones.

Leap Year Checker

Check whether any year is a leap year.

Time Duration Calculator

Find the duration between two dates and times.

Week Number Calculator

Find the ISO 8601 week number for any date.

Day of Week Calculator

Find the day of the week for any date.

Date Adder

Add or subtract days, weeks, months, and years from a date.

Health

BMI Calculator

Body Mass Index calculator with metric & imperial units.

BMR Calculator

Basal Metabolic Rate calculator using Mifflin-St Jeor or Harris-Benedict.

Calorie Calculator

Daily calorie needs and TDEE calculator with activity levels and goals.

Ideal Weight Calculator

Ideal body weight calculator from four medical formulas.

Water Intake Calculator

Estimate your daily water intake from weight and activity.

Body Fat Calculator

Estimate body fat percentage with the US Navy method.

Calories Burned Calculator

Estimate calories burned by activity and duration.

Pace Calculator

Calculate running pace, speed, and finish time from distance and time.

Math

Percentage Calculator

Percentage of a number, percent change, increase/decrease.

Fraction to Decimal Calculator

Convert fractions to decimals and simplify fractions instantly.

GCD Calculator

Find the Greatest Common Divisor of two or more integers.

Prime Number Checker

Check if a number is prime and find its smallest factor if not.

Average Calculator

Calculate mean, median, and mode of any set of numbers.

LCM Calculator

Find the Least Common Multiple of two or more integers.

Factorial Calculator

Calculate the factorial of any non-negative integer up to 170.

Exponent Calculator

Calculate powers and exponents: base raised to any exponent.

Ratio Calculator

Calculate and simplify ratios between two numbers.

Circle Calculator

Calculate the area, circumference, or diameter of a circle.

Standard Deviation Calculator

Standard deviation, variance, mean, and median of a dataset.

Permutation and Combination Calculator

Calculate permutations (nPr) and combinations (nCr).

Quadratic Equation Solver

Solve ax² + bx + c = 0 and find roots, discriminant, and nature.

Triangle Calculator

Solve a triangle from its three sides: area, perimeter, and angles.

Decimal to Fraction Converter

Convert any decimal to a simplified fraction.

Fraction Simplifier

Reduce a fraction to its simplest form.

LCM Calculator

Find the least common multiple of two or more numbers.

Slope Calculator

Find the slope, intercept, angle, and length of a line.

Logarithm Calculator

Compute logarithms with any base, plus ln and log10.

Probability Calculator

Compute probabilities for coins, dice, and drawing without replacement.

GPA Calculator

Calculate your grade point average on a 4.0 scale from courses and credit hours.

Text

Word Counter

Count words, characters, sentences and reading time.

Case Converter

Convert text to uppercase, lowercase, title case, camelCase, and more.

Number to Words

Convert any integer to its English word representation.

Text Reverser

Reverse text by characters, words, or lines instantly.

Character Counter

Count total characters, unique characters, and frequency of each character.

Morse Code Translator

Translate text to Morse code and Morse code back to text.

Pig Latin Translator

Translate English text into Pig Latin.

Remove Duplicate Lines

Remove duplicate lines from a list, keeping the first.

Find and Replace Text

Find and replace text with literal or regex matching.

HTML to Text Converter

Strip HTML tags and convert to plain text.

Word Frequency Counter

Count how often each word appears in text.

Line Sorter

Sort lines of text alphabetically, ascending or descending.

Reverse Words

Reverse the order of words in a sentence.

Trim Whitespace

Normalize, trim, or remove whitespace from text.

Generators

QR Code Generator

Create QR codes for links, text, Wi-Fi and more.

Lorem Ipsum Generator

Generate placeholder Lorem Ipsum text for designs and mockups.

Random Number Generator

Generate random numbers within a range using cryptographic randomness.

UUID Generator

Generate random UUID v4 identifiers instantly in your browser.

Hashtag Generator

Generate relevant hashtags from your text for social media posts.

Dice Roller

Roll any number of dice with any number of sides.

Lottery Number Generator

Generate random lottery numbers from a range.

Converters

Length Converter

Convert meters, feet, inches, miles, km and more.

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin instantly.

Weight Converter

Convert between kilograms, pounds, ounces, grams, and more.

Data Size Converter

Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes.

Volume Converter

Convert between liters, gallons, cups, milliliters, and more.

Area Converter

Convert between square meters, square feet, acres, hectares, and more.

Speed Converter

Convert between mph, km/h, knots, meters per second, and more.

Time Converter

Convert between seconds, minutes, hours, days, weeks, months, and years.

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals to numbers.

Binary Converter

Convert between binary, octal, decimal, and hex.

Scientific Notation Converter

Convert between decimal and scientific notation.

Decimal to Percent Converter

Convert between decimals and percentages.

Fraction to Decimal Converter

Convert a fraction to a decimal and detect repeating cycles.

Pressure Converter

Convert between pascal, bar, atm, psi, mmHg and more.

Angle Converter

Convert between degrees, radians, gradians, and turns.

Cooking Converter

Convert between cups, tablespoons, teaspoons, ml, fl oz, pints, quarts, liters and gallons.

Finance

Loan Calculator

Calculate monthly payments, total interest, and total cost for any loan.

Tip Calculator

Calculate tips and split bills between any number of people.

Compound Interest Calculator

Calculate compound interest with optional regular contributions.

Discount Calculator

Calculate sale prices, discounts, and savings instantly.

Sales Tax Calculator

Calculate sales tax on any purchase, before or after tax.

Savings Goal Calculator

Calculate how long it takes to reach your savings goal.

Net Worth Calculator

Calculate your net worth: total assets minus total liabilities.

Simple Interest Calculator

Simple interest calculator for loans, deposits, and investments.

ROI Calculator

Return on Investment calculator with annualized ROI.

Mortgage Calculator

Mortgage calculator with monthly payment, total paid, and interest.

Inflation Calculator

Inflation calculator: see how money loses value over time.

Salary Calculator

Convert hourly wage to annual, monthly, weekly, and daily salary.

Retirement Calculator

Project your retirement savings and check a target.

Unit Price Calculator

Compare prices by computing the cost per unit.

Fuel Cost Calculator

Estimate fuel cost for a trip from distance, fuel efficiency, and fuel price.

Design

Color Converter

Convert between hex, RGB, and HSL color formats instantly.

CSS Gradient Generator

Create CSS gradients (linear, radial, conic) with live preview.

Hex to RGB Converter

Convert hex colors to RGB and HSL with a live swatch.

CSS Box Shadow Generator

Generate CSS box-shadow with a live preview.

Color Contrast Checker

Check WCAG color contrast between two colors.

Aspect Ratio Calculator

Reduce width and height to a simple aspect ratio.

Color Palette Generator

Generate complementary, analogous, triadic, tetradic, and monochromatic palettes from a base color.

Security

Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 back to text instantly.

Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly.

JWT Decoder

Decode JSON Web Tokens and inspect header, payload, and expiry.

Caesar Cipher

Encrypt and decrypt text with a Caesar (shift) cipher.

Password Generator

Generate strong, random passwords with custom length and character sets.

Developer

JSON Formatter

Format, validate, and beautify JSON with custom indentation.

URL Encoder & Decoder

Encode text for URLs or decode URL-encoded strings instantly.

Markdown to HTML Converter

Convert Markdown text to clean HTML instantly in your browser.

Slug Generator

Convert text to URL-friendly slugs for web pages and blog posts.

HTML Entity Encoder & Decoder

Encode HTML entities or decode entity-encoded text instantly.

Token Counter

Estimate token count for LLM prompts (GPT-4, Claude, Llama, Mistral).

Regex Tester

Test regular expressions with live match highlighting and groups.

Cron Expression Generator

Generate cron expressions for scheduled tasks with human-readable descriptions.

Meta Tag Generator

Generate SEO meta tags, Open Graph, Twitter Cards, and JSON-LD schema.

Email Validator

Check if an email address is valid and well-formed.

URL Parser

Break a URL into protocol, host, path, query, and fragment.

JSON to CSV Converter

Convert a JSON array of objects to CSV.

CSV to JSON Converter

Convert CSV data to a JSON array of objects.

CSS Minifier

Minify CSS by removing comments and whitespace.

JavaScript Minifier

Minify JavaScript by removing comments and whitespace.

HTML Minifier

Minify HTML by removing comments and whitespace.

SQL Formatter

Format and beautify SQL queries with indentation.

ASCII Text Converter

Convert text to ASCII codes and back.

Markdown Table Generator

Convert CSV, tab, pipe, or whitespace data into a GitHub-flavored markdown table.

About ultraquick.tools

ultraquick.tools is a growing collection of free online utilities — calculators, converters and generators. Everything runs locally in your browser, so your data never leaves your device. No accounts, no tracking-heavy ads, no clutter.

Why use our tools?

Private by design — all calculations happen in your browser, nothing is uploaded.
No sign-up — every tool is free and instantly usable.
Fast & lightweight — pages load in a blink, even on slow connections.
AI-ready — each tool has a free JSON API and copy-paste prompts for AI assistants.
Mobile friendly — works perfectly on phones, tablets and desktops.

Support us

These tools are free to use. If they save you time, tap the Tip Us button (bottom right) to buy us a coffee — it helps keep new tools coming.