100% In-Browser WebTools & Games
Secure, fast, and 100% in-browser utilities and games. Zero server transmission.
Explore by Purpose8 Hubs
Organized into 8 dedicated hubs based on what you want to achieve
Money & Living
Money & LivingMortgage, take-home salary, tax, savings comparison, and business metrics
Body & Health
Body & HealthBMI, body fat, BMR, exercise calories, alcohol metabolism, and life events
Calendar & Nature
Calendar & NatureJapanese calendar, date differences, moon phase, comfort index, and disaster physics
Science & Math
Science & MathEquations, calculus, matrices, geometry, circuits, mechanics, and unit converter
Data & Statistics
Data & StatisticsDescriptive stats, distributions, regression analysis, special functions, and data visualizer
Dev & Converters
Dev & ConvertersJSON/YAML converter, Base64, JWT inspector, RegEx, SQL formatter, UUID & hash generators
Media & Documents
Media & DocumentsPDF workspace, image converter, favicon creator, icon margin fitter, and AI background remover
Hobbies & Games
Hobbies & GamesNEO 2048, Life Game, Boids, Tarot, Cyber Klotski, Slide 15 Puzzle, and sports stats
Featured Tools & Games
Quick access to popular utilities, calculators, and games
PDF Toolkit (All-in-one PDF Workspace)
100% client-side. Merge, split, rotate, reorder, blank/QR page splitting, image export, true redaction, OCR, and size reduction — all on one screen.
Miyab-Calc Engine (High-Precision Web Calculator)
100% local, arbitrary-precision decimal math. Fast loan repayment, BMI, calendar/astronomy, calculus, statistics, and special-function calculations.
SSH Key Toolkit (Keypair Generation & Analysis)
Browser-based SSH keypair generation (Ed25519/ECDSA/RSA), OpenSSH ⇄ PuTTY conversion, and fingerprint analysis.
X.509 Certificate Toolkit (Local CA & Cert Generation)
100% client-side. Create local development root CAs, issue SAN-capable SSL/TLS certificates, generate CSRs, and inspect/convert certs.
QR Code Toolkit (Generate, Scan, Screen-Share Scan)
100% local. Generate QR codes for URL/WiFi/contact/otpauth, and safely scan from images, clipboard, camera, or screen sharing.
AI Audio to MIDI Studio (Source Separation & MIDI)
Separate AI-generated music or vocals entirely in-browser, and convert to pitch-bend MIDI compatible with VOCALOID.
DevToys Web (Developer Tool Collection)
A lightweight, handy collection of developer web tools: JSON/YAML conversion, Base64 encoding, hash generation, and more.
High-Precision Time Signal & Real-Time Clock
Never drifts, never stops, even left open for hours — a 100% local time signal powered by the Web Audio API.
Local Video → GIF Converter
Convert video files to GIF safely and quickly with WebAssembly — nothing is uploaded.
Multi-Encoding URL Encoder / Decoder
Supports UTF-8, Shift_JIS, and EUC-JP. Real-time, browser-only URL encoding and decoding.
Image Format Converter (Batch & ZIP)
Instantly convert between JPEG, PNG, WEBP, BMP, GIF, AVIF, and ICO in your browser. Supports batch processing and ZIP export.
Favicon (.ico) Generator
Instantly and safely generate a multi-size favicon.ico from an image, entirely in your browser.
CYBER PUCK: OVERDRIVE (Neon Air Hockey)
Fully serverless WebRTC P2P matches! A cyberpunk air hockey game with intense neon glow effects, procedural Web Audio sound, and 60fps physics.
NEO-CYBER LIFE GAME
Conway's Game of Life with a cyber neon-glow look. Click or tap to place cells and simulate life.
AETHER-FLOW BOIDS
A mesmerizing flocking simulator with mystical light trails, paired with generative ambient soundscapes.
Arcana Nocturne Tarot Reading
An authentic 22-card Major Arcana tarot reading, drawn from physically shuffled chaos.
Neo Effect 2048
An exhilarating take on 2048 with screen shake, combo effects, synth SFX, and aurora particles.
Hakoiri Musume NEO (Cyber Klotski)
A cyber-Japanese take on the classic Klotski sliding puzzle, with buttery-smooth drag-and-snap and cherry-blossom effects.
Neo Effect Sliding 15 Puzzle
A guaranteed-solvable puzzle backed by mathematical parity checks, with combo voice cheers, a rainbow clear glow, cherry blossoms, and gagaku music.
Algorithm Visualizer & Sound Engine
Visualize bubble, quick, merge, and other sorting algorithms with Web Audio API tones and Big-O explanations.