Essential toolkit for developers. String transformations, number converters, calculator, and math operations - all in one place.
Users
14
+1 in 30 days
Rating
0.0 / 5
unchanged in 30 days
Ratings
0
0 in 30 days
Store rank
#177K
#148K among extensions
Version
2.0.0
updated 4 Nov 2025
Users
monthly, 12 months
Latest, 21 Oct 2026:14 usersMove the mouse over the chart for any month
Ratings count
monthly, 12 months
Latest, 21 Oct 2026:0 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About DevToolkit
Transform your browser into a powerful development workspace with DevToolkit - a beautiful, fast, and privacy-focused toolkit that combines essential string transformations and number utilities. Everything you need for daily development work, right at your fingertips.
⨠KEY FEATURES
š¤ STRING UTILITIES - 16 Powerful Transformations
Case Transformations:
⢠UPPERCASE - Convert all text to uppercase letters
⢠lowercase - Convert all text to lowercase letters
⢠Capitalize - Make the first letter of text uppercase
⢠Title Case - Capitalize the first letter of each word
⢠camelCase - Convert text to camelCase format for JavaScript variables
⢠snake_case - Convert text to snake_case format for Python/database naming
⢠kebab-case - Convert text to kebab-case format for URLs and CSS classes
Text Manipulation:
⢠Reverse - Reverse the order of characters in your text
⢠Trim - Remove leading and trailing whitespace
⢠Remove Spaces - Strip all spaces from text
⢠Remove Duplicates - Remove duplicate lines from multi-line text
Encoding & Formatting:
⢠URL Encode - Encode text for safe URL usage
⢠URL Decode - Decode URL-encoded text back to readable format
⢠Base64 Encode - Encode text to Base64 format
⢠Base64 Decode - Decode Base64 encoded text
⢠Slugify - Convert text to URL-friendly slugs (hello-world-format)
š¢ NUMBER UTILITIES - Complete Mathematical Toolkit
š§® Full-Featured Calculator:
⢠Basic Operations: Addition, Subtraction, Multiplication, Division
⢠Decimal Support: Work with floating-point numbers
⢠Percentage Calculations: Quick percentage operations
⢠Memory Functions: Clear and backspace for easy corrections
⢠Live Expression Display: See your calculation as you build it (e.g., "2 + 3")
⢠Keyboard Support: Type directly on your keyboard - no mouse needed!
Calculator Keyboard Shortcuts:
⢠0-9: Number input
⢠+, -, *, /: Mathematical operations
⢠Enter or =: Calculate result
⢠Backspace: Delete last digit
⢠Escape or C: Clear calculator
⢠.: Decimal point
⢠%: Percentage
š Number Base Converters:
Convert numbers between different number systems instantly:
⢠Binary (Base 2) - Perfect for bit operations and computer science
⢠Octal (Base 8) - Unix permissions and legacy systems
⢠Decimal (Base 10) - Standard number system
⢠Hexadecimal (Base 16) - Color codes, memory addresses, and more
Smart Input Detection:
⢠Automatic detection of input format (0b for binary, 0o for octal, 0x for hex)
⢠One-click copy buttons for each conversion
⢠Real-time conversion as you type
š Math Operations:
⢠Square Root (ā) - Calculate āx with precision
⢠Square (x²) - Calculate x squared
⢠Percentage Calculator - Find x% of y
⢠Sum Calculator - Add comma-separated numbers (e.g., 1,2,3,4,5)
⢠Instant results with copy functionality
š REAL-TIME TEXT ANALYSIS
Get instant insights about your text:
⢠Character Count - Total characters including spaces
⢠Word Count - Number of words in your text
⢠Line Count - Number of lines
⢠Unique Characters - Count of distinct characters
⢠Number Count - How many digits are in the text
⢠Space Count - Total spaces
⢠Uppercase Letters - Count of capital letters
⢠Lowercase Letters - Count of small letters
⢠Special Characters - Punctuation and symbols
Perfect for:
⢠Meeting character limits (Twitter, SMS, meta descriptions)
⢠Writing requirements (essays, articles, blog posts)
⢠Code review and documentation
⢠Data validation and quality checks
š USAGE STATISTICS
Track your productivity:
⢠Daily Operations Counter - Resets at midnight
⢠Total Operations Counter - Lifetime statistics
⢠Beautiful animated number displays
⢠No data sent anywhere - all stored locally on your device
šØ BEAUTIFUL DESIGN
⢠Modern gradient theme (Indigo ā Violet ā Fuchsia)
⢠Smooth animations and transitions
⢠Clean, intuitive tabbed interface
⢠Responsive design that adapts to your workflow
⢠Professional UI inspired by modern design principles
š USE CASES
For Developers:
⢠Convert variable naming conventions (camelCase ā snake_case ā kebab-case)
⢠Encode/decode URLs and Base64 for API testing
⢠Calculate percentages for CSS layouts and responsive design
⢠Convert between number bases for low-level programming
⢠Quick math operations without leaving your browser
⢠Generate URL-friendly slugs for routes and endpoints
For Content Creators:
⢠Format text for different platforms
⢠Count words and characters for content requirements
⢠Create SEO-friendly URLs with slugify
⢠Remove duplicate lines from lists
⢠Text analysis for optimization
For Students:
⢠Math calculations and base conversions
⢠Text transformations for assignments
⢠Character counting for essay requirements
⢠Quick reference for encoding formats
For Everyone:
⢠Basic calculator always at hand
⢠Text formatting and cleanup
⢠Copy/paste utilities
⢠Number conversions for daily tasks
š PRIVACY & SECURITY - YOUR DATA STAYS YOURS
100% Private & Secure:
ā All processing happens locally in your browser
ā Zero data collection - we don't track anything
ā No external API calls or network requests
ā No analytics, no tracking, no third-party services
ā Open source - verify the code yourself
ā Minimal permissions - only clipboardWrite and storage
What We DON'T Do:
ā No data collection
ā No browsing history tracking
ā No external server communication
ā No user profiling
ā No data selling
ā No advertisements
Local Storage:
The only data stored is your usage statistics (operation counts), which:
⢠Lives only on your device
⢠Never transmitted anywhere
⢠Can be cleared by uninstalling the extension
⢠Used only to show you your productivity stats
ā” PERFORMANCE
⢠Lightning Fast: All operations execute instantly
⢠Lightweight: Under 100KB total size
⢠No Dependencies: Pure vanilla JavaScript
⢠Offline Ready: Works without internet connection
⢠Low Memory: Minimal resource usage
⢠Battery Friendly: Efficient code that doesn't drain power
šÆ WHY CHOOSE DEVTOOLKIT?
All-in-One Solution:
Instead of opening multiple websites or apps for dā¦