Tools Directory
All our free online tools for calculations, conversions, and useful tasks. No signup, everything runs in your browser.
Calculators
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Percentage Calculator
Calculate percentages online free. Find percentage of a number, what percent is X of Y, and percentage increase/decrease.
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Rule of Three Calculator
Calculate proportions with the rule of three. Free online calculator for direct and inverse proportionality problems.
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Average Calculator
Calculate the average (arithmetic mean) of any set of numbers instantly. Free online calculator for grades, expenses, statistics, and data analysis.
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Fraction to Decimal Converter
Convert fractions to decimals instantly. Free online converter for math homework, engineering, and everyday use.
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Percentage Change Calculator
Calculate the percentage change between two values to see how much something has increased or decreased.
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BMI Calculator
Calculate your Body Mass Index (BMI) instantly with our free online calculator. Supports metric (kg, cm) and imperial (lb, ft/in) units. Get your BMI value and WHO classification for adults—underweight, normal, overweight, or obese—in one click.
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GCD / LCM Calculator
Calculate the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of two or more numbers. Our free online calculator uses Euclid's algorithm for GCD and supports 2 to 6 numbers. Enter your values and get instant results for GCD, LCM, or both.
Converters
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Temperature Converter
Convert temperatures between Celsius and Fahrenheit instantly. Free online converter for cooking, weather, and science.
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Distance Converter
Convert distances between kilometers and miles instantly. Free online converter for travel planning and navigation.
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Weight Converter
Convert weights between kilograms and pounds instantly. Free online converter for cooking, fitness, and shipping.
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Bytes Converter
Convert digital storage units between bytes, KB, MB, and GB instantly. Free online converter for file sizes and storage capacity.
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Time Unit Converter
Convert time units between seconds, minutes, and hours instantly. Free online converter for time calculations and scheduling.
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Markdown to HTML Converter
Convert Markdown to HTML instantly. Free online converter with real-time preview. Supports headers, lists, bold, italic, code blocks, and links. All processing runs locally in your browser.
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HTML to Markdown Converter
Convert HTML to Markdown instantly. Free online converter for migrating content, documentation, and CMS export. Supports p, h1–h6, ul/ol, a, strong, em, code. Input is sanitized before conversion. All processing runs locally.
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CSV to JSON Converter
Convert CSV to JSON instantly. Paste CSV or upload a file. Choose delimiter (comma, semicolon, tab) and whether the first row is headers. Supports UTF-8 and BOM. All processing runs locally.
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JSON to CSV Converter
Convert JSON to CSV instantly. Paste JSON or upload a file. Choose delimiter (comma, semicolon, tab) and how to handle nested objects (flatten or stringify). All processing runs locally.
Developer Tools
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IBAN Generator
Generate valid IBANs for testing and development. Free online IBAN generator with correct checksum validation (MOD 97-10) for all countries.
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JSON Formatter & Minifier
Format JSON with proper indentation or minify to reduce file size. Free online tool. All processing runs locally in your browser.
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URL Encode & Decode
Encode special characters in URLs or decode encoded URLs. Free online URL encoder/decoder. All processing runs locally in your browser.
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Base64 Encode & Decode
Encode text or binary data to Base64 or decode Base64 strings. Free online tool with UTF-8 Unicode support. All processing runs locally.
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SHA-256 / MD5 Hash Generator
Generate cryptographic hashes from text using SHA-256, SHA-384, SHA-512, or MD5. Free online hash generator. All processing runs locally in your browser—your data never leaves your device.
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QR Code Generator
Create QR codes from any text or URL. Choose size (128–512 px), error correction level (L, M, Q, H), and output format (PNG or SVG). Download your QR code for printing or embedding. All processing runs locally in your browser—no data is sent to any server.
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UUID v4 Generator
Generate cryptographically secure UUID v4 identifiers for databases, APIs, and applications. Generate single or multiple UUIDs. All processing is local.
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JSON-LD Validator
Validate JSON-LD structured data against Schema.org. Check syntax and structure for WebPage, FAQPage, and BreadcrumbList. Free online validator with clear error and warning messages. All validation runs locally in your browser.
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Unix Timestamp Converter
Convert Unix timestamps to readable dates or dates to timestamps. Supports seconds and milliseconds. Shows UTC and local time. Free online tool.
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Password Generator
Generate secure random passwords for your accounts and applications. Configure length (8–128 characters), character types (uppercase, lowercase, numbers, symbols), and optionally exclude ambiguous characters. All generation happens in your browser—no data is sent to any server.
Text Tools
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Case Converter
Convert text between different case styles instantly. Adapt variable names, object keys, and identifiers to camelCase, PascalCase, snake_case, kebab-case, UPPER_CASE or lower case with one click.
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Text Counter
Get accurate word count, character count, and other text statistics for your content. Perfect for essays, articles, social media posts, and any writing project.