Currency Converter
Convert 150+ currencies with live exchange rates, historical charts and a market board.
Finance
41 tools100% free · no sign-up · private
Every tool you need, free and instant.
Calculators, converters and utilities for money, health, work and code. Everything runs in your browser, so your data never leaves your device.
Runs locally in your browser
No account needed
Works offline
41Free tools
7Categories
0Sign-ups required
100%In-browser & private
Your favourites
Pick up where you left off
Most popular
New
Compound Interest Calculator
See how savings grow with compound interest and monthly contributions, with a chart and yearly table.
Finance
BMI Calculator
Body Mass Index, ideal weight range and waist-to-height ratio with personalized tips.
Health
Kanban Board
Drag-and-drop task board that saves to your browser. Plan projects without an account.
Productivity
Scientific Calculator
Scientific calculator with graphing, unit conversion and a history tape.
Productivity
New
Percentage Calculator
Percent of a number, percentage change, increase or decrease, and what percent one number is of another.
Productivity
JSON Formatter
Format, validate, minify and explore JSON with precise error locations. Runs locally.
Developer
New
Image Compressor & Resizer
Compress, resize and convert JPG, PNG and WebP images in bulk without uploading them anywhere.
Design
Password Generator
Strong random passwords generated with your browser's secure crypto and entropy analysis.
Security
Rubik's Cube Solver
Solve a 3x3 cube using an interactive 3D model or your camera, step by step.
Lifestyle
All tools
Currency Converter
Convert 150+ currencies with live exchange rates, historical charts and a market board.
Finance
Crypto Tracker
Live crypto prices, trading charts and a personal portfolio for Bitcoin, Ethereum and 200+ coins.
Finance
Salary Calculator
See your pay per year, month, hour, minute and second across 18 currencies with a live ticker.
Finance
Loan & EMI Calculator
Monthly payment, total interest and a full amortization schedule for any loan or mortgage.
Finance
New
Compound Interest Calculator
See how savings grow with compound interest and monthly contributions, with a chart and yearly table.
Finance
Retirement Planner
Project your retirement savings and compare cost of living in destinations worldwide.
Finance
Subscription Audit
Track recurring subscriptions, visualize monthly spend and find easy savings.
Finance
Pet Cost Calculator
Monthly and lifetime cost of owning a dog, cat or exotic pet, with care guides.
Finance
BMI Calculator
Body Mass Index, ideal weight range and waist-to-height ratio with personalized tips.
Health
Macro Calculator
Protein, carb and fat targets for cutting, bulking or maintenance.
Health
Lifetime Heartbeats
How many times your heart has beaten since birth, with live counter and heart facts.
Health
Lifetime Steps
Total steps and distance walked in your lifetime, compared to famous journeys.
Health
Sleep Calculator
How much of your life you've spent asleep, plus sleep facts and recovery insights.
Health
Breath Counter
Estimate the breaths you've taken in your lifetime and the air volume you've moved.
Health
Kanban Board
Drag-and-drop task board that saves to your browser. Plan projects without an account.
Productivity
Pomodoro Focus Timer
Focus and break timer with session stats, notifications and keyboard shortcuts.
Productivity
Scientific Calculator
Scientific calculator with graphing, unit conversion and a history tape.
Productivity
New
Percentage Calculator
Percent of a number, percentage change, increase or decrease, and what percent one number is of another.
Productivity
New
Date Calculator
Days between two dates, business days, and adding or subtracting days, weeks or months from a date.
Productivity
Unit Converter
Convert length, weight, temperature, area, volume, speed, data and time instantly.
Productivity
Text Analyzer
Word and character counts, reading time, readability score and keyword density for any text.
Productivity
Markdown Editor
Markdown editor with live preview, templates and HTML export.
Productivity
AI Prompt Optimizer
Turn rough ideas into structured prompts for ChatGPT, Claude and Gemini using the RTF framework.
Productivity
JSON Formatter
Format, validate, minify and explore JSON with precise error locations. Runs locally.
Developer
New
Base64 & URL Encoder
Encode and decode Base64, URL, HTML entities and inspect JWT tokens. Unicode-safe and private.
Developer
New
Hash Generator
MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files, plus HMAC signing.
Developer
New
UUID Generator
Generate UUID v4 and time-ordered v7 identifiers in bulk, validate UUIDs and copy in one click.
Developer
Mock Data Generator
Generate realistic test data from a custom schema and export it as JSON or CSV.
Developer
Color Palette Studio
Generate palettes, extract colors from images and check WCAG contrast.
Design
New
Image Compressor & Resizer
Compress, resize and convert JPG, PNG and WebP images in bulk without uploading them anywhere.
Design
QR Code Generator
Create custom high-resolution QR codes with your colors and download instantly.
Design
Password Generator
Strong random passwords generated with your browser's secure crypto and entropy analysis.
Security
Password Strength Tester
Check how strong a password is, estimate crack time and generate secure keys.
Security
Steganography Studio
Hide messages in invisible text or images, with optional AES-256 encryption.
Security
Personality Test (MBTI)
A free Myers-Briggs style test with detailed type analysis, strengths and careers.
Lifestyle
Rubik's Cube Solver
Solve a 3x3 cube using an interactive 3D model or your camera, step by step.
Lifestyle
Age Calculator
Your exact age down to the millisecond, plus a live countdown to your next birthday.
Lifestyle
Age Difference
Compare two birthdates and see the exact age gap in years, days and seconds.
Lifestyle
Trip Cost Estimator
Budget flights, hotels, food and activities for your next trip in any currency.
Lifestyle
Cricket NRR Calculator
Net Run Rate for cricket tournaments with all-out rules and multi-match tracking.
Lifestyle
Digital Minimalism Audit
Audit your screen time and social media habits and get a minimalism score.
Lifestyle
No tools match “”.
Just added
New
Compound Interest Calculator
See how savings grow with compound interest and monthly contributions, with a chart and yearly table.
Finance
New
Percentage Calculator
Percent of a number, percentage change, increase or decrease, and what percent one number is of another.
Productivity
New
Date Calculator
Days between two dates, business days, and adding or subtracting days, weeks or months from a date.
Productivity
New
Base64 & URL Encoder
Encode and decode Base64, URL, HTML entities and inspect JWT tokens. Unicode-safe and private.
Developer
New
Hash Generator
MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files, plus HMAC signing.
Developer
New
UUID Generator
Generate UUID v4 and time-ordered v7 identifiers in bulk, validate UUIDs and copy in one click.
Developer
New
Image Compressor & Resizer
Compress, resize and convert JPG, PNG and WebP images in bulk without uploading them anywhere.
Design
Browse by category
Find the right tool in seconds
Seven collections covering money, health, work, code, design, security and everyday life.
Finance tools
Calculators for money, loans, savings and markets.
8 toolsHealth tools
BMI, nutrition and lifetime body stats.
6 toolsProductivity tools
Timers, calculators, converters and writing tools.
9 toolsDeveloper tools
Formatters, encoders and generators for coders.
5 toolsDesign tools
Colors, images and QR codes.
3 toolsSecurity tools
Passwords, strength checks and private messages.
3 toolsLifestyle tools
Age, travel, personality, sport and fun.
7 tools
Why Digital Tools Hub
Built for speed, privacy and focus
No accounts, no uploads, no clutter. Just tools that work the moment the page loads.
Private by design
Your inputs are processed on your device. Nothing you type or drop in is uploaded or stored on a server.
Instant results
No loading spinners or round-trips. Results update as you type.
Works offline
Install the app and the tools you use keep working on a plane, a train or a patchy connection.
Keyboard friendly
Press Ctrl K on any page to jump to another tool, or / here to search.
Your toolkit
Star favourites and pick up where you left off. Preferences are saved locally, without an account.
Great on any device
Responsive layouts, light and dark themes, and touch-friendly controls on phones and tablets.
How it works
Three steps. Zero friction.
Search or browse
Type what you need, like “percentage” or “compress image”, or explore a category.
Use it instantly
The tool loads in a blink and calculates on your device as you type.
Save, copy or share
Copy results, download files, star favourites or share a link with a friend.
Take every tool with you
Install Digital Tools Hub as an app for one-tap access and offline use. It's free, tiny and needs no app store.
Free online tools for everyday tasks
Digital Tools Hub is a growing collection of free online calculators, converters and utilities. Convert currencies with the live currency converter, plan savings with the compound interest calculator, work out discounts with the percentage calculator or check your BMI in seconds.
Developers can format JSON, encode Base64, generate SHA-256 and MD5 hashes and create UUIDs without pasting sensitive data into a server. Designers can compress images, build color palettes and make QR codes.
Every tool is free, works on phones, tablets and desktops, and keeps your data on your device.
Frequently asked questions
Are these tools really free?
Yes. Every tool is free to use with no sign-up, subscription or usage limit. The site is supported by unobtrusive ads.
Is my data sent to a server?
No. Calculations run in your browser. Data you choose to save, such as Kanban tasks or favourites, is stored locally on your device. Live-rate tools fetch public market data but never send your inputs.
Do the tools work offline?
Tools you have opened before are cached and keep working offline. Tools that need live data, such as currency and crypto rates, need a connection to refresh.
Can I install Digital Tools Hub as an app?
Yes. Use the Install app button on the homepage, or choose “Install app” or “Add to Home Screen” in Chrome, Edge or Safari, to use Digital Tools Hub like a native app.
Can I compress images without uploading them?
Yes. The image compressor resizes and re-encodes JPG, PNG and WebP files with your browser's canvas, so photos never leave your device.
How do I suggest a new tool?
Use the contact page to suggest a tool or report a problem. New tools are added regularly.