Precision Web Utilities
A curated collection of fast, ad-free, and privacy-first online tools. Most run entirely locally in your browser to keep your data secure.
🇬🇧 Popular UK Tools
IR35 Calculator
Inside vs Outside IR35 net take-home comparison.
Salary vs Dividend
Tax-efficient pay calculator for UK company directors.
Stamp Duty (SDLT)
Calculate property tax for first-time buyers and movers.
Fuel Cost & MPG
Calculate UK petrol costs, MPG, and journey expenses.
Stones to Kg Converter
Convert UK body weight (Stones & Lbs) to Kilograms.
Working Days Calculator
Calculate business days including UK Bank Holidays.
UK Tax Calculator
Calculate Take-Home Pay, National Insurance, and Pension.
UK VAT Calculator
Add or remove 20% standard VAT instantly.
Mortgage Calculator
Estimate monthly repayments and Loan-to-Value limits.
Currency Converter
Real-time live exchange rates across the globe.
💻 Developer & Universal Utilities
JSON Formatter
Beautify, parse, and validate JSON with tree views.
Text Diff Checker
Find differences between texts or code side-by-side.
Color Picker
Extract HEX/RGB palettes directly from your images.
Password Generator
Cryptographically secure offline password creator.
Image Compressor
Resize, crop, and convert to WebP/JPG offline.
PDF to Image
High-res offline rendering without server uploads.
Secure Image Host
Auto-destructing temporary image hosting.
QR Generator
Create Wi-Fi, URL, and vCard QR codes instantly.
Unit Converter
Metric to Imperial precision physics engine.
Word Counter
Real-time character counts and reading time stats.
AI Prompt Helper
Engineering framework for ChatGPT and Claude.
Learn & Discover More
Welcome to Mini-Tools.uk: Your Secure Digital Toolbox
The web is increasingly cluttered with slow, ad-heavy websites that ask you to upload your sensitive personal and corporate files to unknown remote servers. At Mini-Tools.uk, we take a fundamentally different and more secure approach. We are building a comprehensive suite of Zero-Trust Web Utilities designed for developers, financial professionals, and everyday users who value their data privacy.
100% Client-Side Processing Architecture
Whenever possible, our tools are engineered using advanced modern JavaScript APIs (such as HTML5 Canvas, Web Crypto API, and Web Workers) to process your data locally within your own browser. This means whether you are formatting confidential JSON API payloads, compressing a scanned passport image, or generating a secure cryptographic password, your data never leaves your device. There are no background server uploads, no databases logging your inputs, and absolutely no risk of your files being intercepted during transit.
Comprehensive Financial and Developer Tools
Our platform is divided into highly specialized categories to serve your daily digital workflows:
- UK Financial Calculators: Navigate the complexities of the UK tax system with our precise UK PAYE Tax Calculator, VAT Calculator, and Mortgage Calculator. All financial calculations are executed in real-time on your CPU.
- Developer Utilities: Streamline your coding process with our offline JSON Formatter, Text Diff Checker, and AI Prompt Helper. Validate and beautify your code without exposing proprietary algorithms.
- Media & Security: Resize and convert WebP/JPG images, extract HEX colors, or convert PDF to Image entirely offline. Secure your accounts with our cryptographically secure Password Generator.
Clean, Fast, and Completely Free
We despise intrusive pop-ups, hidden subscriptions, and artificial paywalls as much as you do. All utilities on the Mini-Tools.uk platform are completely free to use with no artificial limits on file sizes or processing power. By eliminating server round-trips, our tools offer native-app-like speed and zero latency.