343+ Free Developer Tools
343+ free developer tools in one place — no ads, no sign-up. Everything runs in your browser.
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New Tools
browse all- Interactive Periodic TableExplore all 118 elements, filter them and preview phase changes by temperature.Education & Science
- 3D Dice Roller & Coin FlipRoll tabletop dice expressions or flip a coin with browser randomness.Randomness & Games
- GPA & Grade CalculatorCalculate credit-weighted GPA and simulate the semester average needed for a target.Education & Science
- Sleep Cycle & REM CalculatorSuggest sleep or wake times using adjustable cycle and sleep-onset duration.Health & Lifestyle
- Pregnancy Due Date CalculatorEstimate a due date from LMP using Naegele's rule for informational planning.Health & Lifestyle
- FIRE & Retirement CalculatorProject a FIRE portfolio target using expenses, savings, contributions and return.Financial Tools
- Decision Wheel & PickerChoose fairly from a list using cryptographically strong browser randomness.Randomness & Games
- Flashcards & Spaced RepetitionReview a flashcard with a transparent SuperMemo SM-2 scheduling algorithm.Education & Science
- Habit & Streak TrackerMark local calendar days and see a GitHub-style completion streak.Productivity Tools
- Kitchen & Recipe ConverterScale ingredient quantities by servings and convert common kitchen volumes.Daily & Lifestyle
Most used on DevTools
Data Generators
Generate valid test identities, bank accounts and tax numbers for your development and QA environments — no real data involved.
National Identity Generator
Checksum-valid national IDs — TC Kimlik, SSN, Emirates ID, CPF, NRIC and more.
Tax Number Generator
Format-valid tax IDs — VKN, EIN, TFN, Steuernummer, VAT, UEN and more.
IBAN & SWIFT Generator
Validate, format and generate IBANs plus SWIFT/BIC codes.
Barcode Generator
Generate CODE128, EAN, UPC and more — download as SVG or PNG.
Base64 Toolbox
Encode and decode text, files and images with Base64, Base64URL and Data URI support.
YouTube Thumbnail Downloader
Preview and download every available thumbnail size from a YouTube, Shorts or live link.
Browse by category
Every tool runs in your browser — pick a category to dive in, or press ⌘K to search.
Color Tools
Color utilities and generators
Color Blindness Simulator · Color Contrast Checker · Color Converter
Design Tools
Theme builders and design asset generators
Aspect Ratio Calculator · Border Radius Generator · Box Shadow Generator
Data Processing
Format, convert and process data
Base64 Toolbox · C# to VB.NET Converter · CSV Data Viewer
Text & Analysis
Text processing and analysis tools
Binary Text Translator · Case Converter & Text Formatter · Character Frequency Analyzer
Generators
Generate IDs, references and more
Address Generator · ASCII Text Art Generator · Credit Card Generator
Security Tools
Security analysis and authentication tools
AES Encryption · Basic Auth Generator · Bcrypt Generator & Verifier
Network & API Tools
HTTP clients and network utilities
API Mock Server · Bandwidth Calculator · Broken Link Checker
Development Utilities
Essential utilities for developers
.htaccess Generator · 2D Fluid Dynamics & Particle Physics Sandbox · Algorithm Arena & Data Structure Visualizer
Visual Tools
Preview and convert visual content
Barcode Generator · Base64 Image Encoder · EXIF Viewer & Cleaner
Creator & Business Tools
Privacy-first helpers for creator payouts and business workflows
Code Snippet to Image · Creator Tax Form Guide · Freelance Invoice Generator
Media & Audio
Record, convert and edit audio and video in your browser
Audio Trimmer & Cutter · Screen & WebCam Recorder · Video to GIF Maker
Sound Tools
Synthesizers, sound effects and sound generation in your browser
Ambient Noise Generator · Metronome & Instrument Tuner · Text to Speech (TTS)
Financial Tools
Loan, interest, tax and currency calculators
Compound Interest Calculator · Currency Converter · Discount & VAT Calculator
Productivity Tools
Focus timers, health calculators and speed tests
BMI & TDEE Calculator · Habit & Streak Tracker · Pomodoro Focus Timer
Device & Sensors
Device orientation, sound, camera and location utilities
Digital Bubble Level · Digital Compass · GPS Speedometer
Education & Science
Learning, exams, grades and scientific references
Exam & Section Timer · Flashcards & Spaced Repetition · GPA & Grade Calculator
Daily & Lifestyle
Kitchen, travel, clothing and everyday planning
Clothing & Shoe Size Chart · Fuel Cost & Trip Calculator · Kitchen & Recipe Converter
Health & Lifestyle
Informational sleep and pregnancy planning tools
Pregnancy Due Date Calculator · Sleep Cycle & REM Calculator
Randomness & Games
Fair random choices, dice and raffles
3D Dice Roller & Coin Flip · Decision Wheel & Picker · Random Number & Raffle Picker
Time & Productivity
Stopwatches, countdowns and pacing tools
Fullscreen Countdown Timer · Precision Stopwatch
Text & Writing
Language and text analysis utilities
Anagram Solver & Palindrome
AI Tools
Assemble context, manage prompts and prep RAG data for LLM workflows
AI Code Explainer · AI Commit Message Generator · AI Documentation Generator
Frequently asked questions
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