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Tools Hub — 200+ Free Online Tools | Curious Assistant

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Discover 200+ free online tools for students, developers, designers, and professionals. Calculate, convert, generate, and optimize—all in one place.

200+

Free Tools

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Popular Tools

Trending

Password Generator

Image Compressor

Student & Education

20 tools

Calculate Grade Point Average with precision tracking.

CGPA Calculator

Cumulative GPA for semester-wise academic tracking.

Predict future CGPA based on expected grades.

Semester Planner

Organize courses, assignments, and exams.

Attendance Calculator

Calculate required attendance percentage.

Credit Hour Calculator

Calculate total credit hours and course load.

Exam Score Predictor

Estimate exam scores based on preparation.

Result Percentage & Grade Calculator

Convert marks to percentage and letter grades.

GPA Improvement Calculator

Calculate how retaking exams improves GPA.

Professional Transcript Generator

Generate academic transcripts in PDF format.

Boost productivity with focused work sessions.

Student Budget Planner

Plan and track student expenses.

Expense Tracker

Track daily expenses and manage budget.

Create multiple choice questions for exams.

Exam Paper Maker

Generate printable exam papers and tests.

Kids Learning Corner

Educational tools and resources for children.

Research Title Generator

Generate academic research paper titles.

Timetable Maker

Create class schedules and timetables.

AI-powered resume and CV creator.

Format text for LinkedIn and professional use.

Developer & Code Tools

25 tools

JSON Formatter/Validator

Format, validate, and beautify JSON data.

XML ↔ JSON Converter

Convert between XML and JSON formats.

Encode/decode Base64 and preview images.

URL Encoder/Decoder

Encode and decode URLs for web transmission.

HTML Entity Encoder/Decoder

Convert special characters to HTML entities.

Markdown to HTML

Live preview editor for Markdown conversion.

CSS Minifier/Beautifier

Minify or beautify CSS code.

JavaScript Minifier

Compress JS code for faster loading.

Beautify and format SQL queries.

Code Diff Checker

Compare two code blocks and highlight differences.

Advanced Regex Tester

Test and debug regular expressions.

API Request Builder

Build and test HTTP API requests.

JWT Token Decoder

Decode and inspect JSON Web Tokens.

Cron Expression Parser

Parse cron expressions to human-readable format.

Lorem Ipsum Generator

Generate placeholder text for mockups.

Meta Tag Generator

Generate SEO-optimized meta tags.

robots.txt Generator

Create robots.txt files for crawlers.

Schema Markup Generator

Generate JSON-LD structured data.

Open Graph Generator

Generate social media preview meta tags.

IP Subnet Calculator

Calculate IP subnets and network ranges.

Basic Algorithm Visualizer

Visualize sorting and search algorithms.

Logic Gates Solver

Solve and visualize digital logic gates.

DNS Lookup Tool

Check domain DNS records.

SSL Certificate Checker

Check SSL certificate expiration.

HTTP Status Checker

Check bulk URL status codes.

Finance & Business

26 tools

EMI / Loan Calculator

Calculate Equated Monthly Installments.

Compound Interest Calculator

Calculate investment growth with compound interest.

Simple Interest Calculator

Basic loan math and simple interest.

Mortgage Refinance Calculator

Analyze break-even points for refinancing.

Rent vs Buy Calculator

Compare renting vs buying a home.

Car Loan Calculator

Calculate auto financing options.

Credit Card Payoff Calculator

Plan debt payoff strategy.

Retirement Savings Calculator

Plan 401k and IRA retirement goals.

Net Worth Calculator

Calculate total net worth.

Savings Goal Calculator

Calculate time to reach savings targets.

Break-Even Calculator

Find break-even point for business.

Crypto Profit Calculator

Calculate Bitcoin and altcoin gains.

Stock Average Calculator

Calculate average cost basis for stocks.

Dividend Calculator

Calculate dividend yield and income.

Calculate Net Present Value.

Calculate Internal Rate of Return.

Business Name Generator

Generate creative business names.

Invoice Number Generator

Generate professional invoice numbers.

Create printable receipt templates.

CAPM Calculator

Calculate expected returns using CAPM.

Payback Period Calc

Calculate investment recovery time.

Burn Rate Calculator

Calculate startup runway and burn rate.

Calculate Customer Acquisition Cost.

Calculate Customer Lifetime Value.

Markup Calculator

Calculate retail pricing markup.

Margin Calculator

Calculate profit margins.

Health & Fitness

18 tools

Calculate Body Mass Index with categories.

Calculate Basal Metabolic Rate.

TDEE Calculator

Calculate Total Daily Energy Expenditure.

Macro Calculator

Calculate protein, carb, and fat split.

Body Fat % Calculator

Estimate body fat using Navy method.

Ideal Weight Calculator

Calculate ideal weight using multiple formulas.

Calorie Burn Calculator

Calculate calories burned by activity.

Heart Rate Zone Calculator

Determine optimal training zones.

One Rep Max Calculator

Estimate maximum lift capacity.

Sleep Cycle Calculator

Calculate optimal wake times.

Water Intake Calculator

Calculate daily hydration needs.

Protein Intake Calculator

Calculate daily protein requirements.

Carb Cycling Calculator

Plan high and low carbohydrate days.

Medication Dosage Calc

Calculate medication dosages.

IV Drip Rate Calculator

Calculate intravenous drip rates.

Target Heart Rate

Calculate target heart rate for cardio.

VO2 Max Estimator

Estimate cardiovascular fitness level.

Lean Body Mass Calc

Calculate muscle weight and lean mass.

Utilities & Productivity

28 tools

Count words, characters, and sentences.

Text to Speech Maker

Convert text to speech with word count.

Image Compressor

Reduce image file size without quality loss.

Enhance image resolution using AI.

PDF to Image Converter

Convert PDF pages to images.

QR Code Scanner / Creator

Generate and scan QR codes.

Time Zone Converter

Convert times across time zones.

View time in multiple timezones.

Calculate exact age to the second.

Countdown Timer

Track time remaining for events.

Precision stopwatch with lap timing.

Auto-saving text editor.

Checklist Maker

Create and print customizable checklists.

Typing Speed Test

Test WPM typing speed with accuracy.

Reading Speed Calculator

Measure reading speed in WPM.

Random Number Generator

Generate random numbers in ranges.

Random Name Picker

Perfect for teachers and group activities.

Random team selection generator.

Virtual coin flip with best of 3 option.

List Randomizer

Shuffle and randomize list items.

Email Spam Inspector

Analyze emails for spam score.

Screen Resolution Checker

Detect display specs and resolution.

Browser Info Detector

Parse user agent and browser info.

Website Speed Tester

Analyze website performance.

Edit and modify PDF documents.

Pet Age Calculator

Convert pet age to human years.

Fuel Cost Calculator

Calculate trip fuel costs.

Paperless Calculator

Calculate environmental impact of going paperless.

Design & Creative

14 tools

Color Palette Generator

Generate palettes from images or randomly.

CSS Gradient Generator

Create beautiful CSS gradients.

Flexbox Generator

Interactive CSS Flexbox layout builder.

Grid Layout Generator

Visual CSS Grid designer with interactive controls.

Favicon Generator

Generate multi-size favicon.ico files from images.

App Icon Generator

Generate iOS and Android app icon sizes automatically.

Color Contrast Checker

Check WCAG accessibility compliance for colors.

Color Blind Simulator

Preview designs through color blindness types.

Image Collage Maker

Create photo collages with grid layouts.

Quote Image Generator

Generate social media graphics with quotes.

Bar Chart Maker

Create simple bar charts for data visualization.

Line Graph Maker

Visualize trends with line graphs.

Instagram Post Maker

Create square templates for Instagram posts.

Wedding Planner Tools

Budget and timeline planning for weddings.

Math & Science

20 tools

Scientific Calculator

Advanced calculator with functions and trigonometry.

Percentage Calculator

Calculate percentages, increases & differences.

Fraction Calculator

Add, subtract, multiply, divide fractions with steps.

Ratio Calculator

Calculate and simplify ratios and proportions.

Percentage Change Calc

Calculate percentage increase and decrease.

Standard Deviation Calc

Calculate sample and population standard deviation.

Statistics Calculator

Descriptive statistics and data analysis.

Statistics Calculator (Advanced)

Regression analysis and advanced statistics.

Math Matrix Calculator

Matrix operations, multiplication, inverse, determinant.

Number System Converter

Convert binary, decimal, octal, hexadecimal.

Roman Numeral Converter

Convert between Roman numerals and Arabic numbers.

Geometry Calculator

Calculate area, volume, perimeter for shapes.

Trigonometry Solver

Calculate sin, cos, tan and solve triangles.

Calculus Calculator

Calculate derivatives and integrals with steps.

Quadratic Equation Solver

Find roots with detailed steps.

Periodic Table Explorer

Interactive periodic table with element details.

Molecular Mass Calculator

Calculate molar mass of chemical compounds.

Chemical Equation Balancer

Balance chemical equations automatically.

Equation Balancer (Upgrade)

Step-by-step chemical equation balancing.

Atomic Mass Calculator

Calculate atomic mass based on elements.

Converters

18 tools

Unit Master (Unit Converter)

Convert length, weight, temperature, and more.

Temperature Converter

Convert Fahrenheit, Celsius, Kelvin, Rankine.

Speed Converter

Convert mph, km/h, knots, mach, and more.

Pressure Converter

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

Energy Converter

Convert joules, calories, BTU, kWh, and more.

Power Converter

Convert watts, horsepower, kilowatts, and more.

Volume Converter

Convert liters, gallons, cups, and cooking measurements.

Cooking Converter

Convert cups to grams and cooking measurements.

Data Storage Converter

Convert bits, bytes, KB, MB, GB, TB, to yottabytes.

Angle Converter

Convert degrees, radians, grads, and more.

Coordinate Converter

Convert DMS to decimal degrees and coordinate formats.

Paper Size Converter

Convert between A4, letter, legal, and paper sizes.

Morse Code Translator

Translate text to Morse code with audio.

Binary/Hex/Octal Calc

Convert between binary, hexadecimal, octal.

Convert ASCII codes to text characters.

Epoch Time Converter

Convert Unix timestamps to readable dates.

Time Duration Calculator

Calculate duration between two times or dates.

Working Days Calculator

Calculate business days excluding weekends.

Security & Privacy

12 tools

Random Strong Password Generator

Generate cryptographically secure passwords.

Password Generator

Create memorable yet secure passphrases.

Password Strength Checker

Analyze password entropy and security.

Hash Generator (MD5/SHA)

Generate MD5, SHA-1, SHA-256, SHA-512 hashes.

Generate HMAC signatures for API authentication.

Password Hash Checker

Verify bcrypt, Argon2, and other password hashes.

SSL Certificate Checker

Check SSL certificate expiration and validity.

HTTP Status Checker

Check bulk URL status codes and responses.

Open Graph Generator

Generate social media preview meta tags.

Email Spam Inspector

Analyze email content for spam triggers.

Sales Tax Calculator

Calculate sales tax for multiple states.

Discount Calculator

Calculate discounts and sale prices.

Data & Analysis

9 tools

Statistics Calculator

Descriptive statistics and analysis tools.

Bar Chart Maker

Create simple bar charts for visualization.

Line Graph Maker

Visualize trends with line graphs.

Image Details Analyser

Analyze image metadata and EXIF data.

Analyze video codec, bitrate, and metadata.

Audio Inspector Pro

Analyze audio waveform and frequency.

Calculate Return on Investment.

Calculate tips and split bills.

Significant Figures Calc

Calculate with proper significant figures.

Physics Tools

12 tools

Force Calculator (Newton's Law)

Calculate force using Newton's laws.

Velocity Calculator

Calculate velocity, speed, distance, time.

Acceleration Calculator

Calculate acceleration in motion physics.

Projectile Motion Calculator

Calculate trajectory and projectile motion.

Wave Frequency Calculator

Calculate wave frequency and wavelength.

Pendulum Time Period Calculator

Calculate simple harmonic motion period.

Centripetal Force Calculator

Calculate circular motion forces.

Free Fall Calculator

Calculate free fall physics and gravity.

Ohm's Law & Power Calculator

Calculate voltage, current, resistance, power.

Physics Formula Solver

Solve physics formulas and equations.

Physics Problem Solver

Solve mechanics and thermodynamics problems.

Half-life Calculator (Radioactivity)

Calculate radioactive decay half-life.

Productivity & Lifestyle

3 tools

Scientific Notation Calc

Calculate with E-notation and scientific notation.

Calculate acidity and alkalinity pH levels.

Bill Tip Calculator

Calculate tips and split bills among friends.

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