43 standalone tools · 7 categories
All Tools
Every tool on Toolhub with its own dedicated page — password generator, UUID generator, base64 converter, JSON formatter, BMI calculator, loan calculator, and 37 more. All free, all browser-side, no signup.
Developer Tools
10Base64, URL, HTML, JSON, hash, JWT, Unix timestamp, regex, number base, text stats — every developer utility in one place.
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 strings back to plain text. Runs entirely in your browser — your data never leaves your device.
URL Encoder & Decoder
Percent-encode URLs, query parameters, or decode URL-encoded strings back to plain text. Browser-only, no signup.
HTML Encoder & Decoder
Convert special characters to HTML entities (<, &, etc.) or decode HTML entities back to readable text. Browser-only, no signup.
JSON Formatter & Validator
Paste messy JSON, get it pretty-printed with proper indentation. Validates syntax and shows exact error locations. Browser-only, no signup.
Hash Generator — SHA-1, SHA-256, SHA-384, SHA-512
Generate cryptographic hashes of any text using the Web Crypto API. Supports SHA-1, SHA-256, SHA-384, and SHA-512. Browser-only, no signup.
JWT Decoder — Decode JSON Web Tokens
Paste any JWT to instantly decode the header and payload. See all claims (sub, exp, iat, etc.) in readable JSON. Browser-only — your token never leaves your device.
Unix Timestamp Converter
Convert Unix timestamps (epoch seconds or milliseconds) to human-readable dates, or convert any date to a Unix timestamp. Browser-only, no signup.
Regex Tester — Test Regular Expressions
Test your regular expressions against any text input. See all matches highlighted and capture groups extracted. JavaScript regex flavor. Browser-only, no signup.
Number Base Converter — Binary, Octal, Decimal, Hex
Convert numbers between binary, octal, decimal, hexadecimal, and any base from 2 to 36. Browser-only, no signup.
Text Statistics — Word, Character, Line Counter
Get instant statistics on any text: word count, character count (with and without spaces), line count, sentence count, paragraph count, and estimated reading time.
Random Tools
4Generate strong passwords, RFC 4122 UUIDs, lorem ipsum placeholder text, and random numbers with the browser's crypto-secure RNG.
UUID Generator — RFC 4122 v4
Generate RFC 4122-compliant UUID version 4 identifiers using the browser's crypto.getRandomValues(). Bulk generate up to 1000 at once. Browser-only, no signup.
Password Generator — Strong & Secure
Generate strong, secure, random passwords using the browser's cryptographically secure random number generator. Customize length and character sets. Browser-only — passwords never leave your device.
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text by words, sentences, or paragraphs. Perfect for design mockups, content layouts, and template testing. Browser-only, no signup.
Random Number Generator
Generate random integers or floating-point numbers in any range, with or without duplicates. Uses the browser's cryptographically secure random number generator. Browser-only, no signup.
QR & Barcode
1Generate custom QR codes for URLs, WiFi, contact info, and more. Download as PNG. Adjustable size, colors, error correction.
Finance
8Simple/compound interest, loan, mortgage, ROI, profit margin, VAT, discount — full personal and business finance calculators.
Simple Interest Calculator
Calculate simple interest on a principal amount at a fixed annual rate over any time period. See the formula, calculation steps, and final amount.
Compound Interest Calculator
Calculate how your money grows with compound interest. Supports regular contributions, monthly/quarterly/annual compounding, and shows the breakdown of principal vs. interest over time.
Loan Calculator — Monthly Payment & Amortization
Calculate monthly loan payments, total interest paid, and see the full amortization schedule. Works for personal loans, auto loans, and any fixed-rate installment loan.
Mortgage Calculator — Monthly Payment
Calculate your monthly mortgage payment including principal, interest, property taxes, and insurance. See how down payment size and interest rate affect your monthly payment.
ROI Calculator — Return on Investment
Calculate return on investment (ROI) as a percentage and an annualized rate. Compare multiple investment options. Useful for stocks, real estate, business investments, and marketing campaigns.
Profit Margin Calculator
Calculate profit margins (gross, operating, net) and markup from revenue and cost data. Understand the difference between margin and markup. Browser-only, no signup.
VAT Calculator — Add or Remove VAT
Add VAT to a net amount or remove VAT from a gross amount. Supports any VAT rate. Common rates: UK 20%, Germany 19%, France 20%, Ireland 23%. Browser-only, no signup.
Discount Calculator — Sale Price
Calculate sale price after a discount, the discount amount, or the original price before a discount. Supports percentage discounts (e.g., 25% off) and fixed-amount discounts.
Health & Fitness
5BMI, BMR/TDEE, body fat percentage (US Navy method), ideal weight (Devine), daily water intake — health calculators.
BMI Calculator — Body Mass Index
Calculate your Body Mass Index (BMI) from height and weight. See your BMI category (underweight, normal, overweight, obese) and healthy weight range for your height.
BMR & TDEE Calculator — Calorie Burn
Calculate your Basal Metabolic Rate (BMR) — calories burned at rest — and Total Daily Energy Expenditure (TDEE) including activity. Use these numbers for weight management.
Body Fat Calculator — US Navy Method
Calculate your body fat percentage using the US Navy method (neck, waist, hip measurements). More accurate than BMI for athletes and muscular individuals. Browser-only, no signup.
Ideal Weight Calculator — Devine Formula
Calculate your ideal body weight using four medical formulas (Devine, Robinson, Miller, Hamwi). Based on height and gender. Used by doctors for medication dosing and surgical planning.
Water Intake Calculator — Daily Hydration Goal
Calculate your daily water intake goal based on body weight, activity level, and climate. See your recommended daily hydration in liters, ounces, and cups.
Color Tools
3Color converter (HEX/RGB/HSL/CMYK/LAB), palette generator with harmony rules, WCAG contrast checker.
Color Converter — HEX, RGB, HSL, HSV, CMYK, LAB
Convert colors between HEX, RGB, HSL, HSV, CMYK, and LAB color spaces. Pick a color visually or enter a value in any format. Copy any format with one click.
Color Palette Generator
Generate harmonic color palettes from any base color. Six harmony rules: complementary, analogous, triadic, tetradic, split-complementary, monochromatic. Copy HEX values instantly.
Color Contrast Checker — WCAG Accessibility
Check color contrast for WCAG 2.1 accessibility compliance. See AA, AAA, AA Large, and UI Component ratings. Get suggested accessible alternatives if your colors fail.
Color Studio Pro
1212-module professional color toolkit — generator, palette manager, gradient studio, brand kit builder, picker, accessibility, projects, history, export.
Color Studio Dashboard
Overview of all 12 Color Studio modules — generator, palette manager, gradient studio, brand kit builder, picker, accessibility checker, projects, history, export, settings.
Color Palette Generator — Harmonic Palettes
Generate harmonic color palettes with 6 rules (analogous, complementary, triadic, tetradic, split-complementary, monochromatic). Lock colors you like, press Space to shuffle the rest. Export to CSS, Tailwind, Figma.
Bulk Color Generator — Up to 10,000 Colors
Generate up to 10,000 colors using 5 strategies: random, spectrum, gradient, harmony, named (Tailwind's full named color database). Export to JSON, CSV, CSS variables, or Tailwind config.
Palette Manager — Save & Organize Palettes
Save and manage color palettes — edit colors, reorder, add/remove swatches, favorite, search, filter by harmony type. Export to CSS variables, Tailwind config, JSON, Figma tokens.
Gradient Studio — Linear, Radial, Conic Gradients
Design multi-stop gradients in linear, radial, or conic mode. Drag stops to reposition, pick from 9 presets, copy CSS code with one click. Export for production use.
Brand Kit Builder — Color Systems & Typography
Build complete brand kits: 6 color roles (primary, secondary, accent, background, surface, text), gradient, 3-slot typography, and live UI preview. Export to CSS variables or Markdown documentation.
Color Picker — EyeDropper & Image Sampling
Pick colors from anywhere on your screen using the EyeDropper API (Chrome 95+), or upload an image and extract dominant colors. Copy any format instantly.
Accessibility Checker — WCAG 2.1 Contrast
Check color contrast for WCAG 2.1 AA/AAA compliance. See live preview with sample UI, get suggested accessible alternatives if your colors fail, and copy the result.
Projects — Organize Palettes by Client
Organize color palettes, gradients, and brand kits by project or client. Track stats (palette count, last update), quick-create new palettes within a project.
History — Color & Palette Activity Feed
Every color, palette, and gradient you've created or copied is logged here. Search by name, filter by kind (color/palette/gradient), favorite important entries, re-copy any time.
Export Center — CSS, Tailwind, Figma, SVG, PNG
Export palettes, gradients, and brand kits in 7 formats: CSS variables, Tailwind config, JSON, Figma tokens, SVG card, PNG image, Markdown. 100% browser-side.
Studio Settings — Color Studio Preferences
Customize Color Studio: appearance (theme, accent, hex display), default generation (palette size, harmony rule, copy format), keyboard shortcuts, local storage management.
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