Convert between 150+ world currencies with live daily exchange rates from central banks. Includes 7d/30d/90d/1y history charts, historical date lookup, favorite pairs, popular pairs, all-currency table and CSV export.
Mifflin-St Jeor, Harris-Benedict and Katch-McArdle BMR + TDEE and full calorie goal table.
Full fraction suite: add/subtract/multiply/divide/power, mixed numbers, simplify, decimal↔fraction (with repeating detection), big-number (BigInt), multi-operand expressions, compare/sort, step-by-step solutions.
Pretty-print minified JavaScript with proper indentation, line breaks after braces and semicolons, and string/template preservation.
Combine JPG, PNG or WebP images into a single PDF. Reorder pages, pick A4/Letter, portrait or landscape, and set page margin — runs entirely in your browser.
Browse 12 hand-picked Google Font pairings for modern websites. Live preview with sample headings and body copy plus copy-ready embed code.
Convert text to natural-sounding speech using your browser's built-in voices. Pick voice, adjust speed, pitch and volume, then play, pause or stop — supports 100+ languages.
Robinson, Miller, Devine, Hamwi and healthy BMI weight range with metric/imperial.
Percent-encode or decode URLs and query components (encodeURI vs encodeURIComponent) and inspect the parsed protocol, host, path and query parameters.
Convert any title into a clean, SEO-friendly URL slug. Choose separator (-/_/.), strip stopwords (the, a, and…), cap length, and batch-process one slug per line.
Record voice memos, podcasts or interviews from your microphone with pause/resume, live timer, playback and .webm download. Everything stays on your device.
All-in-one percentage: X% of Y, X is what % of Y, % change, increase/decrease, add/subtract %, tip — with step-by-step working.
Loan EMI with down payment, processing fee, moratorium, prepayment, floating rate and loan comparison.
Format any XML document with proper indentation and validation, or minify it for transport. Uses the browser's native XML parser to catch errors instantly.
Flip a virtual coin one at a time with animation, or run up to 10,000 flips in a batch to explore probability. Live heads/tails counter.
Project your 401(k) with salary growth, employer match, catch-up limits and 4% rule retirement income.
P(A∪B), P(A∩B), conditional probability, independence, nCr / nPr / n^k / n!, plus normal-distribution Z-score tail probabilities.
Convert between YAML and JSON both ways with one click. Perfect for Kubernetes manifests, GitHub Actions workflows, Docker Compose, and any app configuration file.
Crop any image to precise pixel dimensions in the browser and download the cropped PNG. 100% client-side — your images never leave your device.
Roth IRA growth with 2024 contribution limits plus Roth vs Traditional after-tax comparison.
Turn any topic or keyword list into a bank of ready-to-copy hashtags for Instagram, TikTok, X/Twitter, LinkedIn and YouTube. Click a tag to copy it or grab them all at once.
Generate barcodes in 9 formats — CODE128, CODE39, EAN-13, EAN-8, UPC, ITF-14, MSI, Codabar, Pharmacode. Custom colors, size, text label and PNG/SVG export.
Due date from LMP, conception, ultrasound or IVF transfer with trimester and milestones.
Build Markdown tables visually with any number of rows and columns, per-column alignment (left / center / right) and pretty-formatted output — perfect for README files, GitHub issues and docs.
Overtime + double-time pay with FLSA time-and-a-half, effective hourly rate and projected annual pay.
Split a PDF into multiple files by custom page ranges (e.g. 1-3, 5, 7-9) or one file per page. 100% in-browser — your file never leaves your device.
Convert SVG code or files to high-resolution PNG images at up to 8× scale with transparent, white or black backgrounds. Runs 100% in your browser — no upload.
Total ROI, annualised return, money multiple, doubling time and comparison vs savings / FD / S&P 500 / equity benchmarks.
Build a robots.txt file visually with multiple user-agent blocks, allow / disallow paths, crawl-delay and sitemap URL. Copy or download — perfect for controlling search-engine crawlers.
Sales Tax, VAT, GST with 30+ regional presets: add/remove tax, reverse solve, multi-item cart, margin pricing, rate comparison, discounts, shipping and rounding.
Pick any color and instantly get HEX, RGB, HSL, HSV and CMYK codes. Generate complementary, triadic and analogous harmonies, Tailwind-style tints/shades, WCAG contrast scoring and CSS gradients.
Hours between two times with break deduction, decimal hours, regular vs overtime split and gross pay estimate.
Crypto-secure passwords, passphrases and PINs with entropy meter, crack-time estimate, batch generation and similar-character exclusion.
Extract the dominant color palette from any image and pick individual pixel colors with a click. Perfect for brand color matching, moodboards and design inspiration.
Build a two-column HTML email signature with your name, role, phone, email and website — copy-paste into Gmail, Outlook or Apple Mail.
Format messy CSS with proper indentation (2, 4 spaces or tab) or minify it to the smallest possible size. Instant conversion, byte-savings report and one-click download.
Full scientific calculator: trig (deg/rad/grad), hyperbolic, log/ln, factorial, nCr/nPr, fractions, scientific/engineering modes, memory and history.
Simple interest with multi-unit time, solve-for any variable, schedule, comparison and export.
Count days between two dates with optional weekend exclusion and business-day total.
Generate up to 500 fake user profiles with realistic names, emails, phones, ages and cities — export as JSON or CSV for testing.
Boost productivity with the Pomodoro Technique: 25-minute focused work sprints separated by 5-minute breaks and a longer 15-minute break every 4 cycles. Fully customizable.
Multi-country income tax: USA, India (new/old), UK, Canada, Australia, Bangladesh with slabs, take-home and effective/marginal rate.
Convert images between PNG, JPG, WebP, BMP, SVG and ICO (favicon). Batch mode, transparency handling, optional resize and ZIP download — runs entirely in your browser.
Convert any date and time between 30+ major world timezones side-by-side. DST-aware and ideal for scheduling meetings, live streams and international calls.
Exact age in years/months/days, next birthday, zodiac, generation, life-progress, retirement countdown and compare ages.
Break any URL into protocol, host, port, path, query params and hash. Edit or add query parameters visually and get the rebuilt URL instantly. Perfect for API debugging and marketing UTM tracking.
A precise online stopwatch with millisecond accuracy, lap timing and copyable results. Perfect for workouts, cooking, presentations, studying and speedruns.
Turn typed text into realistic handwritten notes on ruled, grid or plain paper with 5 handwriting fonts, custom ink color, size and tilt. Download as PNG for assignments and notes.
Generate a professional GitHub README with title, tagline, badges, features, install, usage, tech stack and license sections.
Compress JPG, PNG or WebP images with quality slider, max-width resizing and target-KB binary search. Convert formats on the fly.