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📈 Finance & Business
Calculators and financial utilities for investments, taxes, e-commerce, and currency exchange.
Compound Interest Calculator
Calculate the growth of your investments with our free compound interest calculator. Visualize wealth accumulation over time.
Real-Time Currency Converter
Convert global currencies instantly with live, up-to-date foreign exchange rates.
VAT & Sales Tax Calculator
Instantly calculate Net, Gross, and Tax amounts. Works in both directions for easy invoicing.
ROAS & Profit Calculator
Calculate your Break-even ROAS, gross margins, and net profit per sale for e-commerce campaigns.
Freelance Hourly Rate Calculator
Determine your ideal billable rate to hit your target take-home salary after taxes, business overhead, and vacations.
Discount & Sale Price Calculator
Instantly calculate final sale prices, money saved, double stacked discounts, and applicable sales tax.
Percentage Calculator
Free online percentage calculator. Calculate percentage of a number, percentage increase or decrease, what percent is X of Y, and price changes instantly.
⏱️ Time & Productivity
Stay organized, track business days, manage world time zones, and boost focus.
Pomodoro Focus Timer
Boost your productivity with a custom 25-minute timer based on the Pomodoro technique.
Current Week Number
Instantly check the current ISO week number and discover upcoming public holidays for your specific region.
Business Days Calculator
Calculate the exact number of working days between two dates, automatically excluding global public holidays.
World Time Zone Converter
Convert time across global tech hubs instantly and plan meetings for remote teams.
Age Calculator & Milestone Tracker
Calculate your exact age in years, months, days, hours, and seconds. View your next birthday countdown, zodiac sign, milestone dates, and lifetime statistics.
💻 Developer & Web Tools
Essential utilities for web developers, designers, and digital marketers.
JSON Formatter & Validator
Beautify, minify, and validate JSON data instantly with syntax error detection.
CSV ⇄ JSON Converter
Convert datasets between CSV and JSON format seamlessly. Fast, flexible delimiters, and 100% in-browser.
Text Diff Checker & Compare Tool
Compare two text or code snippets side-by-side with visual line addition and deletion highlighting.
Base64 Encoder & Decoder
Encode plain text, UTF-8 strings, and images into Base64 format, or decode Base64 back into its original data.
Meta Tag & Open Graph Previewer
Preview social share cards for Google, Facebook, Twitter, and generate clean meta tags for your website.
CSS Box Shadow Generator
Design modern UI elevation and soft card shadows visually, then copy clean CSS properties.
Screen Color Picker
Grab any color from your screen using our eyedropper tool to instantly get HEX, RGB, and HSL codes.
Custom QR Code Generator
Create branded QR codes with your own logo in the center. Change colors and download high-res PNGs instantly.
UTM URL Builder
Generate custom campaign URLs with UTM parameters to track marketing efforts in Analytics.
IP Address Lookup
Check your public IP address, geolocation, ISP, and network data instantly.
UUID / GUID Generator
Free online UUID / GUID v4 generator. Bulk generate cryptographically secure RFC 4122 compliant UUIDs with custom formatting, uppercase, braces, and live validation.
✍️ Text & Content Tools
Analyze, format, and generate content for writers, editors, and web developers.
Word & Character Counter
Analyze your text in real-time. Instantly calculate words, characters, sentences, and estimated reading time.
Speech & Reading Time Calculator
Calculate how long it takes to read or speak your text. Perfect for podcasters, public speakers, students, and content creators.
Case Converter & Text Transformer
Change text casing between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and clean up spaces.
Lorem Ipsum & Dummy Text Generator
Generate customizable placeholder text for website mockups, layouts, and print publishing.
Duplicate Line Remover
Free online duplicate line remover. Instantly clean text lists, remove repeated lines, trim whitespace, sort alphabetically, and view line reduction stats.
📏 Converters & Everyday Utilities
Helpful everyday converters, recipe adjusters, and security generators.
Universal Unit Converter
Instantly convert volume, weight, length, area, and temperature. Free, fast, and accurate global unit converter.
Baking Pan Converter
Easily scale your recipes. Calculate exact ingredient multipliers when switching between round, square, or rectangular pans.
Aspect Ratio & Dimension Calculator
Scale photos, banners, and video dimensions without distortion. Find aspect ratios from width and height instantly.
Secure Password Generator
Create robust and randomized passwords instantly. Protect your online accounts with cryptographically secure combinations.
🎲 Games & Decision Making
Randomizers, timers, and game dashboards for tabletop players and decision-makers.
Board Game Timer & Picker
Keep game night moving with a digital turn timer and an animated first player randomizer.
Random Decision Maker
Can't decide? Pick a random item from a list, flip a coin, or get a Yes/No answer instantly.
Warhammer 40k Tactical Dashboard
Track battle rounds, Command Points, Victory Points, and draw secondary mission cards.
3D Dice Roller
Free 3D animated online dice roller for D&D, tabletop RPGs, and board games. Roll D4, D6, D8, D10, D12, D20, D100, custom dice pools, advantage, and coin flips.
Why choose MrTool.app?
Welcome to MrTool.app, your premier destination for high-speed, single-purpose web utilities. We believe that finding a quick answer or transforming data on the internet shouldn't require reading through bloated blog posts, downloading desktop software, or creating unwanted accounts. That is why we built a streamlined, lightning-fast platform offering 31 precise calculators, converters, and digital tools.
🔒 100% In-Browser Privacy
All calculations, parsing, and encodings happen directly in your browser. Your sensitive files and data never leave your device.
⚡ Instant & Ad-Friendly
Zero framework bloat. Engineered with clean, lightweight vanilla JavaScript for immediate page loads on desktop and mobile.
🛠️ Continuously Expanding
Our toolbox grows every month with new calculators and utilities requested by developers, creators, and professionals.