Free Online Tools
for Everyone
Color tools, health calculators, developer utilities, document generators, and more. All running privately in your browser. No signup, no fees, instant results.
Color Tools
9 tools for designers & developers
Color Palette Generator
Generate harmonious 5-color palettes from any starting hue.
CSS Gradient Generator
Build linear and radial CSS gradients with live preview.
WCAG Contrast Checker
Test color pairs against WCAG 2.1 AA and AAA standards.
CSS Box Shadow Generator
Generate CSS box shadows with slider controls and live preview.
Color Format Converter
Convert HEX to RGB, HSL, RGBA, and CSS custom properties.
Tints and Shades Generator
Generate a full 11-step color scale from any hex color.
Color Scheme Generator
Generate complementary, analogous, and triadic color schemes.
Color Name Finder
Find the closest CSS named color for any HEX code.
Image Color Extractor
Upload an image and extract its dominant color palette.
Random Tools
9 tools for decisions & games
Wheel Spinner
Spin the wheel for classrooms, giveaways, and decisions.
Yes or No Wheel
Spin the yes or no wheel for instant random decisions.
Dice Roller
Roll any dice type online: D4 through D100.
Coin Flip
Flip a fair digital coin and get instant heads or tails.
Random Number Generator
Generate random numbers between any minimum and maximum.
Team Generator
Split any list of names into randomly balanced teams.
Countdown Timer
Free countdown timer that runs entirely in your browser.
Card Picker
Draw random cards from a standard 52-card deck.
Bracket Generator
Generate randomized single-elimination tournament brackets.
Developer Tools
15 tools for developers & privacy
Strong Password Generator
Generate cryptographically secure passwords up to 64 characters.
IP Address Lookup
Find your public IP address, location, ISP, and ASN.
SHA Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes.
Base64 Encoder and Decoder
Encode text to Base64 or decode any Base64 string.
JSON Formatter and Validator
Format, validate, and minify JSON with syntax highlighting.
QR Code Generator
Generate QR codes for URLs, text, email, phone, or WiFi.
URL Encoder and Decoder
Encode or decode percent-encoded URL strings instantly.
UUID v4 Generator
Generate cryptographically random UUID v4 identifiers.
Text Encryptor
Encrypt and decrypt text with a secret key in your browser.
Test Data Generator
Generate fictional names and addresses for software testing.
Dead Pixel Test
Test your monitor for dead pixels using solid color full-screen panels.
Stuck Pixel Fixer
Fix stuck pixels by rapidly cycling colors across your screen.
Refresh Rate Test
Measure your monitor's actual refresh rate in real time.
Touchscreen Test
Test your touchscreen for dead zones and multi-touch support.
Hacker Typer
Type like a movie hacker. Any keypress outputs realistic-looking code.
Document Tools
8 tools for business documents
Invoice Generator
Create professional invoices with line items and PDF export.
Business Quote Generator
Create professional business quotes and estimates.
Privacy Policy Generator
Generate a GDPR and CCPA compliant privacy policy.
Terms of Service Generator
Generate complete terms of service for any website or app.
NDA Generator
Create a non-disclosure agreement between two parties.
Freelance Contract Generator
Generate a freelance service contract with payment terms.
Receipt Generator
Create professional business receipts with itemized lists.
Disclaimer Generator
Generate a professional disclaimer for any website or blog.
Health Tools
10 tools for health & fitness
BMI Calculator
Calculate your Body Mass Index with metric or imperial units.
TDEE Calculator
Calculate your Total Daily Energy Expenditure.
Calorie Calculator
Calculate your daily calorie needs for any fitness goal.
Macro Calculator
Calculate your daily protein, carbs, and fat targets.
Ideal Weight Calculator
Find your healthy weight range using four established formulas.
Body Fat Percentage Calculator
Estimate body fat percentage using the US Navy method.
Sleep Cycle Calculator
Find the ideal bedtime or wake-up time by sleep cycle.
Water Intake Calculator
Calculate your daily hydration target based on weight and activity.
Age Calculator
Calculate your exact age in years, months, weeks, and days.
Pregnancy Due Date Calculator
Calculate your estimated due date from your last menstrual period.
Why ToolCenterHub
Free tools that just work
100% private
Everything runs in your browser. No data is ever sent to a server, not your passwords, health numbers, or document content.
Zero cost
51 tools, completely free. No account, no subscription, no paywall. Open any tool and use it immediately.
Instant results
No page reloads, no waiting. Results update in real time as you type or adjust controls.
Works everywhere
Every tool is responsive and touch-friendly. Use them on desktop, tablet, or phone with no install.
From the blog
Guides & Articles
Dead Pixel Test: How to Find and Fix Screen Issues
Learn how to run a dead pixel test, identify dead vs stuck vs hot pixels, fix stuck pixels with our free tool, and know when to file a warranty claim.
Extract Colors from an Image: Get HEX, RGB, and CSS Values
Learn how to extract HEX, RGB, and HSL color values from any image using a free online tool, with tips on dominant colors, accuracy, and converting formats.
Fake Data for Testing: A Developer's Guide to Synthetic Data
Learn why developers use fake identity data for testing, what a generator produces, how it differs from anonymized data, and how to use it correctly.
Need to know
Frequently asked questions
Everything you need to know about using ToolCenterHub. Can't find the answer? Feel free to contact us.
51
Free tools
5
Categories
0
Signups needed
Every tool on ToolCenterHub is free with no account, no subscription, and no hidden fees. Use any tool as many times as you need.
All tools run directly in your browser. No software download, browser extension, or plugin is required.
No. All processing happens locally in your browser. Nothing you enter is ever sent to any server, not passwords, health data, or document content.
Yes. Every tool is fully responsive and touch-friendly. All controls adapt to any screen size, no pinching or zooming required.
They use established clinical formulas, Mifflin-St Jeor for TDEE, US Navy circumference method for body fat, Naegele's rule for due dates. Results are estimates and not a substitute for professional medical advice.
Most tools work offline once the page has loaded in your browser. Only the IP Address Lookup tool requires an active internet connection to fetch your IP data.
No. The password generator and hash generator run entirely in your browser using the SubtleCrypto and crypto.getRandomValues() APIs. No output is transmitted or logged anywhere.