BMI Calculator
Body Mass Index with WHO categories and your healthy weight range.
Use tool →Free Online Tools
117 handy tools across 8 categories, shipping in batches. Every tool computes locally in your browser — your data never leaves your device.
Tools 118
Health 15
BMR Calculator
Basal metabolic rate via Mifflin-St Jeor plus a TDEE activity table.
Use tool →Ideal Weight Calculator
Devine-formula target weight alongside the healthy BMI band.
Use tool →Body Fat Calculator
US Navy tape method plus BMI-based estimate, with ACE categories.
Use tool →Fat-Burning Heart Rate
Training zones by age with Tanaka max HR and Karvonen correction.
Use tool →Protein Intake Calculator
Daily protein range by weight, activity level and goal.
Use tool →Energy Converter
Convert joules, calories, watt hours and BTU with exact factors.
Use tool →Running Calorie Calculator
Calories burned from distance, pace and weight via the MET method.
Use tool →Physical Fitness Test
Self-score fitness 0–100 from BMI, heart rate, exercise and sleep.
Use tool →Best Figure Calculator
Classic body ratio targets by height plus your WHO-risk WHR.
Use tool →Safe Period Calculator
Calendar-method period, ovulation and fertile window dates.
Use tool →Child Height Predictor
Genetic height target from parents’ heights (Tanner formula).
Use tool →Blood Type Calculator
Possible child ABO and Rh types from the parents’ types.
Use tool →Color Blindness Test
Quick original 4-plate red-green color vision check.
Use tool →Vegetable Oil Comparison
Ten cooking oils by fat composition and smoke point.
Use tool →Life 15
World Capitals
All 196 countries and their capital cities with instant search.
Use tool →Flags of the World
Every national flag as copyable emoji — search and filter by continent.
Use tool →Age Calculator
Exact age in years, months and days plus a next-birthday countdown.
Use tool →Retirement Calculator
Retirement date and day countdown from birth date and retirement age.
Use tool →Loan Calculator
Monthly payment, total interest and a 12-month amortization table.
Use tool →Bra Size Calculator
Underbust and bust to US/EU/FR band and cup, with sister sizes.
Use tool →Women’s Underwear Size
Waist and hip to XS–XXL briefs with US and EU equivalents.
Use tool →Dress Size Calculator
Bust, waist and hip matched to US, UK, EU and IT dress sizes.
Use tool →Women’s Clothing Size
Bust, waist and hip to XS–XXL with US, UK and EU conversions.
Use tool →Women’s Shirt Size
Bust measurement to XS–3XL tops with US, UK and EU sizes.
Use tool →Children’s Clothing Size
Height and age to US 2T–16 with EU height-band equivalents.
Use tool →Men’s Clothing Size
Chest and waist to XS–3XL tops with US inches and EU sizes.
Use tool →Men’s Pant Size
Waist and hip to W-sizes, EU numbers and an inseam estimate.
Use tool →VAT / GST Calculator
Add tax to a net price or reverse-extract the tax inside a gross price.
Use tool →Age Difference Calculator
Exact years, months and days between two dates, plus total days and weeks.
Use tool →Generators 7
Random Number Generator
Crypto-strong random integers with unbiased sampling.
Use tool →Random Password Generator
Strong passwords with per-set guarantees and entropy rating.
Use tool →Serial Number Generator
Batch serials in license-key format, unambiguous charset.
Use tool →QR Code Generator
Text or URL to QR with error levels and PNG download.
Use tool →Bar Code Generator
CODE128 and EAN-13 barcodes as crisp print-ready SVG.
Use tool →UUID Generator
Bulk UUID v4 identifiers from crypto randomness, with case and hyphen options.
Use tool →Color Palette Generator
Four harmony palettes from one base color — complementary, analogous, triadic, split.
Use tool →Developer 24
Base Converter
Convert integers between bases 2–36 with BigInt-exact results.
Use tool →Timestamp Converter
Unix seconds or milliseconds to date and back, with world clocks.
Use tool →Base64 Encoder / Decoder
UTF-8-safe Base64 both ways with a URL-safe alphabet option.
Use tool →URL Encoder / Decoder
Percent-encode or decode with component and whole-URI modes.
Use tool →Unicode Encoder / Decoder
Text to \uXXXX, U+ notation or HTML entities — and back.
Use tool →Text to ASCII Converter
Character ⇄ code table with decimal, hex and ASCII flags.
Use tool →Image to Base64
Images to data URLs with HTML/CSS snippets — never uploaded.
Use tool →Compare Text
Side-by-side line diff with LCS matching and color highlights.
Use tool →Markdown Editor
Live Markdown preview with GFM tables and one-click HTML copy.
Use tool →MD5 Hash Generator
Classic MD5 digests for checksums and legacy formats, RFC 1321 verified.
Use tool →SHA Hash Generator
SHA-1/256/384/512 digests via native WebCrypto, all at once.
Use tool →RIPEMD-160 Hash Generator
RIPEMD-160 digests with official test vectors — Bitcoin-ready.
Use tool →HMAC Signature Generator
Keyed HMAC-SHA256/512 signatures via WebCrypto, key stays local.
Use tool →AES Encrypt / Decrypt
Authenticated AES-GCM (128/256) via WebCrypto, random IV, key never stored.
Use tool →DES / TripleDES Encrypt
Legacy DES and 3DES (ECB + PKCS7) for old systems, clearly labeled obsolete.
Use tool →Rabbit Encrypt / Decrypt
RFC 4503 Rabbit stream cipher verified against all official vectors.
Use tool →RC4 Encrypt / Decrypt
Classic RC4 for legacy protocols, verified vectors, honestly labeled insecure.
Use tool →HTML Formatter
Re-indent messy HTML with pre/textarea/script left untouched.
Use tool →CSS Formatter
Re-indent CSS with comments preserved and @media nested.
Use tool →JavaScript Formatter
Prettier-powered JS beautifier with semicolon and quote options.
Use tool →JavaScript Obfuscator
Light client-side obfuscation — string escaping and renaming.
Use tool →Local Port Checker
Check which common ports are reachable on your own machine.
Use tool →CSV ⇄ JSON Converter
RFC 4180-safe CSV to JSON and back, with delimiter and header options.
Use tool →JSON Formatter & Validator
Pretty-print or minify JSON with exact line-and-column error reporting.
Use tool →Converters & Math 13
Length Converter
Convert meters, feet, inches, miles and more with NIST-exact factors.
Use tool →Weight Converter
Convert kg, pounds, ounces, stones and tons instantly.
Use tool →Temperature Converter
Convert Celsius, Fahrenheit and Kelvin with exact formulas.
Use tool →Area Converter
Convert m², ft², acres, hectares and more with exact factors.
Use tool →Volume Converter
Convert liters, gallons, cups and cooking units instantly.
Use tool →Proportion Calculator
Solve a:b = c:x by cross multiplication with three known values.
Use tool →Perimeter Calculator
Perimeter of squares, rectangles, circles, triangles and polygons.
Use tool →Area Calculator
Area of six 2-D shapes with exact formulas and live updates.
Use tool →Surface Area Calculator
Total surface area of cubes, boxes, spheres, cylinders and cones.
Use tool →Volume Calculator
Volume of five standard solids with exact π formulas.
Use tool →Pi Digits Lookup
Look up the first 100–10,000 digits of π, computed live.
Use tool →Data Size Converter
Bytes to every SI and binary data unit (kB/MB/GB, KiB/MiB/GiB) at once.
Use tool →Percentage Calculator
Three percentage questions in one: portions, shares and increase/decrease.
Use tool →Text & Office 19
Word Counter
Count words, characters, sentences, paragraphs and reading time — live as you type.
Use tool →Case Converter
Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case and more.
Use tool →Bold Text Generator
Turn letters into bold Unicode characters for bios, chats and plain-text fields.
Use tool →Italic Text Generator
Convert letters to italic Unicode characters (𝘭𝘪𝘬𝘦 𝘵𝘩𝘪𝘴) that paste anywhere.
Use tool →Strikethrough Text Generator
Cross out text with Unicode combining strokes — no formatting needed.
Use tool →Underline Text
Underline text with Unicode low lines that survive copy-paste.
Use tool →Upside-Down Text Generator
Flip text upside down with Unicode lookalikes — reversible anytime.
Use tool →Mirror Text Generator
Create left-right mirror writing (b↔d, p↔q, brackets flipped).
Use tool →Reverse Text Generator
Reverse characters or word order — emoji-safe and instant.
Use tool →Emoji Collection
Browse and copy curated emoji by category — search by keyword.
Use tool →Emoticon (Kaomoji)
Copy Japanese-style text faces for every mood in one click.
Use tool →Symbols Collection
Arrows, math, currency and special characters — click to copy.
Use tool →Paper Size Chart
A/B/C series and US paper sizes with instant mm ⇄ inches switching.
Use tool →Replace Text
Find & replace text with regex mode, case control and a live counter.
Use tool →Resume Template
Build a clean resume from a form — three styles, copy as text or Markdown.
Use tool →Word Frequency Counter
Rank the words in any text with counts, share bars and a stop-word filter.
Use tool →Lorem Ipsum Generator
Classic placeholder text by words, sentences or paragraphs.
Use tool →Duplicate Line Remover
Deduplicate lines keeping order, with trim, case and empty-line options.
Use tool →Text to Slug
Turn titles into URL slugs with accent folding and tidy separators.
Use tool →Image 17
Color Picker
Pick a color and get HEX, RGB and HSL values plus matching shades — all local.
Use tool →Image Format Converter
Convert PNG, JPEG, WebP, GIF and BMP between formats with a quality slider.
Use tool →Image Compressor
Shrink images by quality slider or an exact KB target via a binary search.
Use tool →Image Resizer
Scale images by exact pixels or percent with an aspect-ratio lock.
Use tool →Aspect Ratio Adjuster
Force any image into 16:9, 4:3, 1:1 or custom ratios by crop or pad.
Use tool →Image Rotator
Rotate by 90/180/270° or any free angle, flip horizontally or vertically.
Use tool →Image Cropper
Drag a selection rectangle or type exact pixels to crop losslessly.
Use tool →Image Watermark
Stamp text watermarks — nine positions, opacity, color and tile mode.
Use tool →Rounded Corners
Give images transparent rounded corners with a smooth antialiased edge.
Use tool →Grid Image Cutter
Slice an image into an N×M grid and download every tile as PNG.
Use tool →Transparent ICO Generator
Transparent favicon .ico at the size you pick, in a hand-packed single-size ICO container.
Use tool →GIF Maker
Combine images into an animated GIF with adjustable frame delay.
Use tool →GIF Frame Extractor
Split a GIF into full PNG frames with real per-frame delays.
Use tool →Video to GIF
Convert a WebM/MP4 clip to a GIF with start time, fps and width caps.
Use tool →Image Color Picker
Click any pixel in an image to read it as HEX, RGB and HSL.
Use tool →Favicon Generator
One image to a full favicon kit: .ico, PNG sizes and link tags.
Use tool →Image to Text (ASCII Art)
Turn images into ASCII art with adjustable width and character ramps.
Use tool →Just for Fun 8
Morse Code Translator
Text ⇄ ITU Morse code both ways, with audio playback.
Use tool →Lucky Wheel
Custom spinner with weighted options and crypto-grade fairness.
Use tool →Lottery Picker
Draw unique winners from a list with a rolling animation.
Use tool →Net Worth Calculator
Assets minus debts, framed in years of income with a fun rank.
Use tool →Life Odometer
Days lived and days ahead on a gentle, lightly framed progress bar.
Use tool →Lucky Number
Life Path number from your birthday with every step shown.
Use tool →Zodiac Lucky Color
Birthday to zodiac sign and lucky color with hex codes.
Use tool →Hash Avatar Generator
Any string to a symmetric identicon SVG — always identical.
Use tool →Categories 8
Health
BMI, calories, heart rate and body calculators
Browse 15 tools →Life
Age, loans, sizes and everyday lookups
Browse 15 tools →Generators
QR codes, barcodes, passwords and random data
Browse 7 tools →Developer
Encoders, formatters, hashes, ciphers and port checks
Browse 24 tools →Converters & Math
Units, geometry and number converters
Browse 13 tools →Text & Office
Case converters, symbols and text utilities
Browse 19 tools →Image
Resize, compress, crop and convert — all local
Browse 17 tools →Just for Fun
Lucky wheels, pickers and novelty tools
Browse 8 tools →