Top Most Popular Free Online Tools

Calculate your Cumulative Grade Point Average (CGPA) across all semesters with weighted credits and instant percentage conversion.

Calculate semester Grade Point Average (GPA) using letter grades (A+, A, B, etc.) or 4.0 scale with custom course credits.

Perform all standard percentage calculations: what is X% of Y, X is what percent of Y, and percentage difference.

Track your college or school attendance percentage and find out how many classes you can bunk or need to attend to maintain target attendance.

Calculate your current course grade and determine the exact score needed on your final exam to achieve your desired target grade.

Boost focus and productivity with an interactive Pomodoro timer featuring custom focus intervals, short breaks, and long breaks.

Calculate your exact age in years, months, weeks, days, hours, and minutes from your date of birth, with countdown to your next birthday.

Calculate your actual monthly take-home salary from your gross CTC, factoring in Basic salary, HRA, EPF deductions, and Professional Tax.

Calculate your new salary and exact monthly pay increase based on your current salary and offered hike percentage or increment amount.

Calculate your total professional work experience in years, months, and days across multiple jobs with gap detection.

Calculate your official last working day (LWD) from your resignation date and notice period length in days or months.

Analyze your resume text for word count, character count, page length estimation (1-page vs 2-page rule), and action verb density.

Compare your resume against a job description to calculate keyword match percentage and identify missing critical skills.

Draft tailored, impactful cover letter templates by inputting your target company, role, key achievements, and skills.

Track and organize your job applications, interview stages, follow-up dates, and salary offers with browser localStorage persistence.

Calculate the exact number of business working days between two dates, excluding Saturdays, Sundays, and custom holidays.

Convert hourly wage to annual salary, monthly earnings, bi-weekly paychecks, and daily income with paid time off adjustments.

Format, beautify, and inspect messy or minified JSON data with 2-space or 4-space indentation, syntax highlighting, and download option.

Validate JSON syntax in real time, locate parsing errors with exact line and column numbers, and view detailed diagnostics.

Beautify and format messy SQL queries with standardized keyword capitalization, clause indentation, and clean line breaks.

Convert plain text, strings, and UTF-8 characters into standard Base64 encoding with optional URL-safe mode.

Decode Base64 encoded strings back into clean, readable plain text with UTF-8 character support and error detection.

Test regular expressions in real time with syntax highlighting, flag toggles (g, i, m, s), capture group breakdowns, and quick cheatsheet.

Generate cryptographically secure RFC 4122 Version 4 UUIDs (Universally Unique Identifiers) in bulk with case and hyphen controls.

Generate secure, randomized passwords with custom length, symbols, numbers, character exclusion, and entropy strength meter.

Generate cryptographic message digests in SHA-256, SHA-512, SHA-1, and MD5 using native Web Crypto APIs.

Convert human-readable dates to Unix timestamps (seconds and milliseconds) and timestamps back to ISO 8601, UTC, and local date formats.

Decode and inspect JSON Web Tokens (JWT) into Header and Payload JSON without transmitting your token over the internet.

Convert color codes between HEX, RGB, HSL, and CMYK formats with interactive color picker and palette preview.

Count words, characters, sentences, paragraphs, and estimate reading and speaking time in real time as you type.

Calculate character counts with spaces, characters without spaces, letter count, digit count, and special symbols.

Calculate estimated silent reading time and spoken presentation duration based on average human reading speeds.

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case, and PascalCase with one click.

Deduplicate lines from lists, emails, keywords, or CSV exports with case sensitivity and empty line controls.

Sort lists alphabetically (A to Z or Z to A), numerically, by line length, or in randomized shuffle order.

Convert article headlines and titles into clean, SEO-friendly URL slugs with lowercase formatting and accent removal.

Generate customizable dummy placeholder text by paragraphs, sentences, words, or lists for UI layouts and wireframes.

A fast, sleek standard calculator for everyday arithmetic with keyboard support, operation memory, and calculation history.

Advanced scientific calculator with trigonometry (sin, cos, tan), logarithms, powers, roots, factorials, and mathematical constants (π, e).

Add, subtract, multiply, and divide fractions and mixed numbers with step-by-step simplification to lowest terms.

Solve equivalent ratios (A:B = C:D), simplify complex ratios to lowest terms, and scale proportions up or down.

Calculate arithmetic mean, geometric mean, harmonic mean, and sum from any set of comma or space-separated numbers.

Calculate sample standard deviation, population standard deviation, variance, and mean with step-by-step deviation tables.

Find the Least Common Multiple (LCM) of two or more numbers with prime factorization steps.

Find the Greatest Common Divisor (GCD / HCF) of two or more numbers using the Euclidean algorithm with step-by-step working.

Check whether a number is prime or composite, discover its complete prime factorization, and find adjacent prime numbers.

Generate cryptographically random numbers within custom ranges, generate unique non-repeating sets, or roll virtual dice.

Calculate your exact age in years, months, weeks, days, hours, and minutes from your date of birth, with countdown to your next birthday.

Calculate the exact number of days, weeks, months, and years between any two calendar dates.

Quickly count the exact total number of days between two dates with optional inclusive day count.

Add a number of calendar days or business days to any starting date to determine the exact future target date.

Calculate elapsed duration between two clock times (hours, minutes, seconds) with overnight 24-hour wrap-around support.

Create real-time countdown timers for custom events, holidays, product launches, and birthdays with full-screen mode and audio alert.

High-precision online stopwatch with millisecond accuracy, lap time split tracking, and CSV lap export.

Compare current times across global timezones (UTC, EST, PST, GMT, CET, IST, JST, AEST) with interactive time slider for meeting scheduling.

Convert between metric and imperial length units: meters, kilometers, centimeters, millimeters, inches, feet, yards, miles, and nautical miles.

Convert between mass and weight units: kilograms, grams, milligrams, pounds (lbs), ounces (oz), stones, and metric tons.

Convert temperatures between Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R) with step-by-step conversion formulas.

Convert between land and geometric area units: square meters, square feet, square yards, acres, hectares, and square kilometers.

Convert liquid and dry volume units: liters, milliliters, cubic meters, US gallons, UK gallons, fluid ounces, cups, and tablespoons.

Convert between speed and velocity units: km/h, mph, meters per second (m/s), knots, feet per second (ft/s), and Mach.

Convert digital storage units between Bytes, KB, MB, GB, TB, and PB in both decimal (1,000 bytes) and binary kibibytes (1,024 bytes).

Convert digits and numbers into spelled-out English words with support for currency check writing (Dollars & Cents, Rupees, Pounds).

Bidirectional converter between Roman numerals (I, V, X, L, C, D, M) and standard Arabic integers with syntax validation.

Convert SQMM to SQFT instantly (1 sq mm = 0.00001076 sq ft). Includes electrical cable wire size chart (1.5mm², 2.5mm², 4mm²), formula, and reverse converter.

Convert SQMM to SQFT instantly (1 sq mm = 0.00001076 sq ft). Includes electrical cable wire size chart (1.5mm², 2.5mm², 4mm²), formula, and reverse converter.

Convert SQFT to SQMM instantly (1 sq ft = 92,903.04 sq mm). Fast bidirectional calculation with formula and electrical wire table.

Convert Gaj to Square Feet instantly (1 Gaj = 9 Sq Ft). Free online land and plot area calculator for India with price estimator.

Convert Square Feet to Gaj instantly (1 Sq Ft = 0.1111 Gaj). Free online plot & land measurement converter.

Convert Sq M to Sq Ft instantly (1 Sq M = 10.7639 Sq Ft). Free online real estate and apartment area calculator.

Convert Square Feet to Square Meters instantly (1 Sq Ft = 0.092903 Sq M). Free online converter for RERA flat sizes and floor plans.

Convert Cent to Square Feet instantly (1 Cent = 435.6 Sq Ft). Essential land measurement calculator for Kerala, Tamil Nadu, Andhra Pradesh & Telangana.

Convert Guntha to Square Feet instantly (1 Guntha = 1,089 Sq Ft). Essential land calculator for Maharashtra, Karnataka, and Gujarat.

Convert Bigha to Square Feet instantly. Supports standard Uttar Pradesh, Bihar, Rajasthan, MP, and Punjab bigha variations.

Calculate Body Mass Index (BMI) using metric (cm/kg) or imperial (ft-in/lbs) units, with WHO weight categories and healthy weight range.

Calculate monthly loan EMI payments, total interest payable, and total payback for home loans, car loans, and personal loans with amortization schedule.

Calculate discounted sale prices, total money saved, and final checkout price with additional sales tax.

Calculate Goods and Services Tax (GST) or VAT for inclusive and exclusive prices with standard tax slabs (5%, 12%, 18%, 28%) and CGST/SGST breakdown.

Calculate restaurant gratuity tips quickly with one-click tip percentages (10%, 15%, 18%, 20%), custom amounts, and total bill tally.

Evenly divide group dining checks, bar tabs, or shared expenses among multiple people with customizable tip and rounding options.

Calculate investment growth and compound interest with compounding frequencies (annually, semi-annually, quarterly, monthly) and regular monthly deposits.

Calculate simple interest, maturity amount, and interest yield for bonds, promissory notes, and short-term loans.

Calculate gross profit, gross margin percentage, and markup percentage from item cost and selling revenue.

Determine the exact sales volume in units and revenue dollars required to cover all fixed and variable business costs.

Convert PDF documents to editable Microsoft Word (.docx) files 100% in your browser without uploading to any remote server.

Merge and combine multiple PDF documents into a single organized PDF file directly in your browser with zero data uploads.

Convert JPG, PNG, and WebP images into high-resolution, beautifully formatted PDF documents.

Create professional freelance and business invoices with itemized pricing, taxes, discounts, and one-click PDF download.

Generate high-resolution, custom-colored QR codes for URLs, text, Wi-Fi networks, and contact info with instant PNG/SVG download.

Compress and optimize photos and graphic images client-side to reduce file size without losing noticeable quality.

Evaluate password entropy, brute-force crack time estimates, and security resilience 100% privately without leaving your device.

Compress and reduce PDF file size online by up to 80% with zero quality loss. 100% private in-browser compression without uploading documents to remote servers.

Combine multiple PDF documents into a single organized PDF file with custom page ordering. Free, fast, and 100% private in-browser.

Separate, cut, and extract specific pages or custom ranges from any PDF document into a new standalone PDF file.

Permanently rotate upside-down or sideways PDF pages by 90°, 180°, or 270° degrees without losing visual quality.

Encrypt your PDF documents with a strong password to prevent unauthorized viewing, printing, and copying.

Add custom text watermarks ("CONFIDENTIAL", "DRAFT", your company name) across all pages of a PDF document with custom opacity and angle.

Insert clean, professional page numbers ("Page 1 of N" or "1, 2, 3") into the headers or footers of your PDF document.

Draw or create your digital signature and stamp it onto agreements, contracts, and PDF documents directly in your browser.

Convert JPG, PNG, and camera photos into clean, organized PDF documents with customizable page margins and orientation.

Resize photos and graphics by exact pixel width/height or percentage while preserving aspect ratio and crisp visual clarity.

Convert transparent PNG images into universal JPG format with clean white background fill and optimized file size.

Convert JPG photos into lossless PNG format with crisp sharpness for graphic design and web publishing.

Convert modern Google WebP images from web pages into standard JPG or PNG images compatible with older software and photo viewers.