All Free Online Tools

Calculate your exact age in years, months, weeks, days, hours, and minutes. Discover your zodiac sign, generation label, birth day of the week, and countdown to your next birthday — all instantly.

Convert between Square Meters, Square Feet, Acres, Hectares, and 10 area units with instant results, formula display, and multi-unit reference table.

Encode and decode Base64 strings instantly online. Convert text to Base64, decode Base64 to text with full UTF-8 and emoji support. Free and fast.

Calculate your Body Mass Index with a visual gradient scale, healthy weight range for your height, weight-to-target guidance, and detailed health category breakdown — in Metric or Imperial units.

Convert text between 12 case formats: UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, dot.case, path/case, and Inverse Case — with live preview and text stats.

Beautify or minify JSON, JavaScript, CSS, and HTML code online for free. Instant code formatter, beautifier, and minifier with syntax highlighting.

Generate beautiful color palettes, check WCAG contrast, simulate color blindness, and extract colors from images — free online color scheme generator.

Free online PDF compressor with image recompression, metadata removal, and adjustable quality slider. 100% client-side — your files never leave your device.

Free online currency converter with live ECB exchange rates. Convert USD to INR, EUR, GBP, JPY and 30+ currencies instantly. Compare up to 10 currencies simultaneously with real-time rates.

Convert between Bytes, KB, MB, GB, TB, PB, and binary units (KiB, MiB, GiB, TiB) with instant results and formula display.

Free online diff checker & code comparison tool. Compare text, code, JSON, XML, and more with syntax highlighting, side-by-side view, and detailed diff statistics. 100% client-side.

Free online image compressor with quality slider, target size mode, format conversion (JPEG/PNG/WebP), batch processing, and before/after comparison. 100% client-side — your images never leave your device.

Free online JSON formatter, validator, and beautifier with tree view, auto-repair, TypeScript generator, and statistics dashboard. 100% client-side.

Free online JWT decoder and parser. Decode JSON Web Tokens instantly, inspect headers, payloads, and claims with color-coded visualization, token timeline, security warnings, and claim-level copy — all 100% client-side.

Convert between Meters, Feet, Inches, Miles, Kilometers, Yards, and 12 length units with instant results, formula display, and multi-unit reference table.

Free online Markdown editor with live preview, syntax-highlighted code blocks, formatting toolbar, rich text copy, and export to HTML & MD. 100% client-side.

Free online PDF merger with drag-to-reorder, page count preview, and instant merging. 100% client-side — your files never leave your device.

Generate cryptographically secure random passwords with a visual strength meter, crack-time estimate, entropy calculation, and one-click presets for PINs, passphrases, and maximum-security keys.

Three instant percentage calculators in one: find X% of a number, calculate what percent X is of Y, and compute percentage change between two values — with formula display, quick presets, and copy-to-clipboard.

Create beautiful, branded QR codes with custom colors, dot styles, logo embedding, and multiple content types — URL, Wi-Fi, vCard, email, SMS. Export as PNG or SVG, 100% free, no sign-up.

Build, test, and debug regular expressions with real-time match highlighting, a token-by-token pattern explainer, 30+ ready-to-use templates, find & replace, and code generation in JavaScript, Python, Go, and PHP.

Convert between km/h, mph, m/s, knots, Mach, and the speed of light with instant results and formula display.

Free online PDF splitter with 4 split modes — custom page ranges, every N pages, equal parts, or extract each page. ZIP download, 100% client-side.

Convert accurately between Celsius, Fahrenheit, Kelvin, and Rankine with instant results, conversion formula display, and visual temperature scale.

Convert between Liters, Gallons, Cups, Fluid Ounces, and 12 volume units with instant results, formula display, and multi-unit reference table.

Convert instantly between Kilograms, Pounds, Ounces, Grams, Stone, Carats, and 12 weight units with real-time results, formula display, and multi-unit reference table.

Count words, characters, sentences, paragraphs, and reading time in real time. Set writing goals with progress tracking, analyze keyword density, and check readability — all instantly in your browser.