All tools

Calculate your exact age in years, months, days, hours, and minutes from any birthdate — instantly.

Free percentage calculator — find X% of Y, percentage change, increase, decrease, and what % one number is of another.

Free BMI calculator — find your Body Mass Index in metric or imperial units with WHO health category interpretation.

Free loan EMI calculator — calculate monthly payment, total interest, and amortization for any loan amount, rate, and tenure.

Free tip calculator — split the bill, add a custom tip percentage, and round per person for fair restaurant payments.

Free discount calculator — work out final sale price, savings, and effective discount on multiple offers.

Free GST calculator — add or remove GST (5%, 12%, 18%, 28%) and split into CGST/SGST for any invoice amount.

Free compound interest calculator — project savings or investment growth with custom rate, frequency, and contributions.

Free mortgage calculator — monthly payment, total interest, and full amortization for home loans in any currency.

Free unit price calculator — compare which grocery pack is the cheapest per gram, kg, liter, or unit.

Free word counter and character counter with sentences, paragraphs, and reading time — for essays, blog posts, and SEO.

Free case converter — change text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, and more.

Free text reverser — reverse a string character-by-character, by word, or by line. Great for puzzles and palindromes.

Free Lorem Ipsum generator — generate placeholder text in paragraphs, sentences, or words for designs and prototypes.

Free small text generator — turn normal text into tiny Unicode small caps for Instagram bios, captions, and Twitter/X.

Free subscript text generator — turn letters and numbers into tiny Unicode subscripts for chemistry, math, and social bios.

Free bold text generator — turn normal text into bold Unicode for Instagram bios, captions, LinkedIn, Twitter/X.

Free italic text generator — convert text into italic Unicode for Instagram, LinkedIn, Twitter/X, and Discord.

Free cursive text generator — turn text into elegant Unicode script and handwriting fonts for bios and captions.

Free strikethrough text generator — add a line through any text for crossed-out promos, edits, and creative posts.

Free underline text generator — add a Unicode underline to any text for emphasis on Instagram, TikTok, and X.

Free strong password generator — cryptographically random passwords with custom length, character sets, and exclusions.

Free password strength checker — entropy-based scoring with crack-time estimates and concrete improvement suggestions.

Free hash generator — produce MD5, SHA-1, SHA-256, and SHA-512 hashes of any text or file in your browser.

Free UUID generator — produce RFC 4122 v4 UUIDs in bulk for databases, APIs, primary keys, and tests.

Free Base64 encoder & decoder — encode or decode text and binary safely with Unicode support and URL-safe option.

Free URL encoder & decoder — percent-encode query strings, paths, and form data safely for HTTP requests.

Free JSON formatter & validator — pretty-print, minify, and catch JSON syntax errors with clear messages.

Free HTML entity encoder & decoder — escape <, >, &, ", and Unicode for safe rendering in HTML and XML.

Free JWT decoder — decode and inspect JSON Web Token header, payload, and signature without verification.

Free regex tester — build and debug JavaScript-compatible regular expressions with live matches and capture groups.

Free Unicode escape converter — convert text to \uXXXX escapes or decode escapes back to readable text.

Free YAML to JSON converter (and back) — switch between configuration formats in one click with full validation.

Free length converter — meters, kilometers, miles, feet, inches, yards, centimeters, millimeters, and more.

Free weight converter — kilograms, pounds, ounces, grams, stones, and tons with two-way live conversion.

Free temperature converter — Celsius, Fahrenheit, Kelvin, and Rankine with live two-way conversion.

Free volume converter — liters, gallons, cups, milliliters, pints, fluid ounces, and more.

Free area converter — square meters, square feet, acres, hectares, square miles, and more.

Free speed converter — mph, km/h, m/s, knots, ft/s — for driving, running, sailing, and aviation.

Free data storage converter — bytes, KB, MB, GB, TB and KiB/MiB/GiB/TiB with clear decimal/binary labels.

Free energy converter — joules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, electronvolts.

Free date difference calculator — find the exact days, weeks, months, and years between any two dates.

Free Unix timestamp converter — convert epoch seconds or milliseconds to human-readable dates and back.

Free countdown timer — count down live to any future date, birthday, launch, deadline, or event.

Free timezone converter — translate any time to and from any IANA timezone with full DST support.

Free SEO slug generator — turn any title into a clean, lowercase, hyphenated, ASCII-safe URL slug.

Free color converter — convert between HEX, RGB, HSL, HSV, and OKLCH instantly with live previews.

Free LLM token counter — estimate token usage for GPT, Claude, Gemini, and Llama prompts in real time.

Free LLM prompt cost estimator — calculate API spend for GPT, Claude, Gemini, and more before you send.

Free tokens-per-second visualizer — compare streaming throughput across GPT, Claude, Gemini, and open models.

Free context window visualizer — see how much fits in GPT, Claude, Gemini, and Llama context windows.

Free word-to-token ratio calculator — measure tokenization density for any text across multiple LLM tokenizers.

Free AI-text readability score — quick heuristic signals (perplexity, burstiness, readability) for any text.

Free system prompt builder — assemble battle-tested system prompts for GPT, Claude, and Gemini with proven patterns.

Free temperature & top-p explainer — visualize how sampling parameters change LLM creativity and consistency.

Free AI image prompt formatter — turn rough ideas into structured prompts for Midjourney, DALL·E, SDXL, and Flux.

Free embeddings dimension reference — vector size, cost, and benchmarks for OpenAI, Cohere, Voyage, and open models.

Free LLM latency budget calculator — plan TTFT, streaming, and tool-call timing for production AI features.

Free read-time estimator — calculate how long any article takes to read, with adjustable reading speed.

Free social media character counter — live limits for Twitter/X, Instagram, LinkedIn, TikTok, YouTube, Threads, and more.

Free engagement rate calculator — measure post or account engagement using the standard creator-economy formulas.