All Online Tools
Browse our complete directory of free web utilities. Filter by category or explore all tools below.
Calculators8
Age Calculator
Calculate your exact age in years, months, days, hours, minutes, and seconds based on your date of birth.
Percentage Calculator
Solve percentage calculations easily: find percentages, percentage differences, and percentage increases/decreases.
Discount Calculator
Calculate final price after discount, total savings, and optional sales tax additions.
Simple Interest Calculator
Calculate simple interest earnings or loan interest payments quickly with principal, rate, and tenure inputs.
Compound Interest Calculator
Calculate compound interest growth over time with customizable compounding frequencies and yearly breakdown charts.
Date Calculator
Calculate the exact number of days between two dates or add/subtract days, weeks, months, and years from any starting date.
Loan Calculator
Estimate monthly loan payments, total interest, and total repayment.
Mortgage Calculator
Estimate mortgage principal and interest payments with optional property costs.
Converters6
Unit Converter
Convert measurement units across length, weight/mass, temperature, area, and volume accurately.
Currency Converter
Convert amounts using recent reference exchange rates for popular currencies.
Time Zone Converter
Compare local dates and times between cities with daylight-saving adjustments.
Data Storage Converter
Convert storage sizes across decimal and binary byte units.
Number Base Converter
Convert signed integers between binary, octal, decimal, and hexadecimal.
Roman Numeral Converter
Convert standard Roman numerals to numbers and numbers to Roman numerals.
Text Tools6
Word Counter
Count words, characters, sentences, paragraphs, reading time, and analyze top keyword density in real-time.
Character Counter
Count exact characters with and without spaces, bytes, and monitor character limit progress for social media platforms.
Case Converter
Convert text instantly between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, kebab-case, and snake_case.
Text Formatter
Clean whitespace, change letter case, and normalize line breaks in text.
Lorem Ipsum Generator
Generate placeholder text by paragraph, sentence, or word count.
Text Diff Checker
Compare two text blocks and inspect added, removed, and unchanged lines.
Developer Tools6
JSON Formatter & Validator
Format, beautify, minify, and validate JSON data with syntax error detection and line highlighting.
Base64 Encoder / Decoder
Encode text strings into Base64 format or decode Base64 back into readable plain text with URL-safe options.
URL Encoder / Decoder
Encode string parameters into percent-encoded valid URLs or decode URL-encoded strings back to human-readable format.
Markdown to HTML
Convert common Markdown headings, lists, links, and emphasis into HTML.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, or SHA-512 hashes locally with the Web Crypto API.
QR Code Generator
Create and download a QR code for text, links, or other short content.
Productivity & Security6
Password Generator
Generate strong, cryptographically secure passwords and memorable passphrases with custom character rules.
Passphrase Generator
Generate a memorable 12- or 24-word passphrase using cryptographic randomness.
Password Strength Checker
Estimate password strength locally from length and character variety.
UUID Generator
Generate random version 4 UUID values in your browser.
File Checksum Verifier
Calculate a file hash and compare it with a trusted expected checksum.
Secret Scanner
Scan pasted text locally for common API token and private-key patterns.
Health & Fitness6
BMI Calculator
Calculate your Body Mass Index (BMI), WHO weight classification, and healthy weight range for adults.
Calorie Needs Calculator
Estimate daily energy needs using the Mifflin–St Jeor equation and activity level.
Body Fat Estimator
Estimate body fat percentage from height and circumference measurements.
Ideal Weight Range Calculator
Show the adult weight range corresponding to standard BMI reference values.
Pace Calculator
Calculate running or walking pace, or estimate finish time from distance and pace.
Water Intake Estimator
Estimate a broad daily fluid range from body weight.
Math & Numbers6
Scientific Calculator
Evaluate arithmetic, powers, trigonometry, logarithms, and roots.
Fraction Calculator
Add, subtract, multiply, divide, and simplify fractions.
Ratio and Proportion Calculator
Solve the missing value in an equivalent-ratio proportion.
Statistics Calculator
Calculate mean, median, mode, range, and standard deviation.
GCD and LCM Calculator
Find the greatest common divisor and least common multiple of two integers.
Random Number Generator
Generate random integers in a range, with an option to avoid repeats.
SEO & Web Tools6
Meta Tag Generator
Generate title, description, canonical, robots, and social-sharing metadata.
SERP Snippet Preview
Preview an approximate search result title, URL, and description snippet.
Robots.txt Generator
Create and download a robots.txt file from common crawler rules.
Open Graph Preview
Preview a social-sharing card using a page title, description, and image URL.
UTM Link Builder
Add campaign tracking parameters to a URL and copy the tagged link.
Slug Generator
Turn a title into a clean lowercase URL slug.
Image Tools6
Image Compressor
Reduce image file size by adjusting output format and quality in your browser.
Image Converter
Convert images between PNG, JPEG, and WebP formats.
Image Resizer
Resize an image to custom dimensions while preserving its aspect ratio when desired.
Background Remover
Remove a solid-color image background with an adjustable color-key tolerance.
Image Cropper
Crop an image by entering a precise rectangular selection.
Image Filter
Adjust brightness, contrast, saturation, grayscale, and sepia before downloading.
PDF Tools6
PDF Merger
Combine multiple PDF documents into one file in the selected order.
PDF Splitter
Extract selected pages or page ranges from a PDF into a new document.
PDF Compressor
Reduce PDF size by rendering pages to optimized images; this trades selectable text for smaller output.
PDF to Image
Render PDF pages as downloadable PNG images in your browser.
Image to PDF
Place one or more images into a downloadable PDF document.
PDF Editor
Add a text note to a chosen PDF page and download the edited copy.
Design Tools7
Color Picker
Choose a color and view its HEX, RGB, and HSL values.
Gradient Generator
Build a CSS linear gradient, adjust its angle and colors, and copy the CSS.
Shadow Generator
Adjust a CSS box shadow and preview the result before copying its code.
Border Radius Generator
Preview and copy CSS border-radius values for rounded shapes and cards.
Color Palette Generator
Create a coordinated five-color palette from a chosen base color.
SVG to PNG
Render an SVG file to a PNG image using the browser canvas.
Favicon Generator
Create a PNG favicon from an image or a text symbol.