Fast, Zero-Latency Tools
100% Client-Side & Free
Free Online All-in-One Web Utilities. Character counting, JSON formatting, compound interest calculators, image compression, password generation, and more.
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Browse utility tools categorized by workflows and disciplines.
Finance & Tax
Compound interest, loan amortization, investment analysis, and tax calculators for smarter financial decisions
Business & Marketing
ROAS, ROI, margin calculation, SaaS metrics, and freelance rate tools for business operators
Developer & Data
JSON formatter, Base64 encoder, regex tester, SQL beautifier, and developer utilities
Text & Writing
Character counter, case converter, markdown editor, and text cleaning utilities
SEO & Webmaster
SERP preview, keyword density, UTM builder, and robots.txt tools for SEO professionals
Image & Graphics
Image compression, format conversion, resizing, filters, watermarks, and EXIF remover
PDF & Documents
Printable PDF maker, digital signature pad, Markdown/HTML conversion, table tools, and document utilities
Audio & Media
Voice recorder, metronome, tone generator, white noise mixer, subtitle converter, and media utilities
Design & CSS
Color converter, CSS gradient, box shadow, cubic-bezier, and Tailwind palette generators
Unit Converters
Length, area, temperature, fuel, data storage, number base, and culinary unit converters
Math & Science
Percentage calculator, equation solver, and engineering & scientific computing tools
Health & Fitness
BMI, BMR, TDEE, calorie & macro calculator, hydration, and sleep cycle tools
Date & Time
D-Day countdown, world time planner, Unix timestamp converter, Pomodoro timer, and stopwatch
Generators & Random
Password, QR code, UUID, barcode, and random picker generators
Security & Hardware
Chmod permissions, subnet mask, hash generator, card validator, and hardware diagnostic tools
Lifestyle & DIY
GPA converter, electricity bill, typing speed, and everyday lifestyle utility tools
All Tools
Explore our featured high-performance client-side web tools.
Character & Byte Counter
Real-time character counter with/without spaces, UTF-8 & EUC-KR bytes, word count, and reading time.
JSON Formatter & Validator
Format, beautify, validate, and minify JSON data with instant syntax error highlighting and tree view.
Compound Interest Calculator
Calculate compound interest with initial principal, monthly deposits, annual returns, and visual asset growth charts.
Image Compressor & Format Converter
100% client-side privacy-first image compressor. Convert between WebP, PNG, and JPG with instant size reduction.
Secure Password & Passphrase Generator
Generate cryptographic-strength random passwords and memorable passphrases with real-time entropy security scoring.
BMI & BMR Metabolic Calculator
Calculate Body Mass Index (BMI), visual obesity gauge, ideal healthy weight, and daily TDEE maintenance calories.
Percentage Master Calculator
All-in-one percentage calculator: What is X% of Y, proportion ratios, percentage change, and retail discounts.
Base64 Encoder & Decoder
Lossless UTF-8 Unicode Base64 encoder and decoder with file upload to Data URL conversion.
Custom QR Code Generator
Generate custom styled QR codes for URLs, instant Wi-Fi access, and text with crisp PNG/SVG exports.
Date, D-Day & Business Days Calculator
Calculate days between dates, working business days excluding weekends, N days projection, and milestones.
Mortgage Loan & Repayment Calculator
Calculate mortgage payments with amortizing, equal principal, or balloon schedules and monthly breakdown.
Marketing ROAS, Net ROI & Break-even CPA Calculator
Calculate return on ad spend (ROAS), net marketing ROI, break-even threshold, and target CPA.
Ecommerce & Marketplace Seller Margin Calculator
Calculate net profit margin, marketplace fees, shipping costs, and final payout for online sellers.
Salary Take-Home Pay & Paycheck Tax Calculator
Calculate take-home pay after payroll taxes, social insurances, and hourly holiday wages.
CAGR & Stock Cost Averaging Calculator
Calculate compound annual growth rate (CAGR) and stock dollar-cost averaging break-even price.
Dividend Reinvestment (DRIP) & Snowball Calculator
Simulate dividend reinvestment plan (DRIP), dividend growth, yield on cost, and passive income milestones.
Inflation & Purchasing Power Decay Calculator
Calculate purchasing power loss over time due to inflation and determine equivalent future living costs.
Freelance Hourly Rate & Project Quote Calculator
Reverse calculate target freelance hourly rate, day rate, and project quotes based on billable hours.
VAT & Global Sales Tax Reverse Calculator
Reverse calculate inclusive/exclusive VAT, net supply prices, and regional sales tax rates.
SaaS Business Metrics & Unit Economics Calculator
Analyze SaaS unit economics including LTV, CAC, MRR, ARR, churn rate, and CAC payback period.
Car Financing vs Lease vs Rental Total Cost Calculator
Compare total cost of car ownership between financing, leasing, and long-term rentals.
FIRE Number & Safe 4% Rule Retirement Simulator
Calculate your target FIRE number based on the 4% rule and project years to financial independence.
Stacked Discounts & Compound Sale Price Calculator
Calculate stacked sale markdowns, promo codes, card discounts, and net effective savings.
Split Bill & Global Tip Gratuity Calculator
Split dinner bills evenly with rounding options and calculate appropriate tip rates for worldwide travel.
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(CLS Prevention Active 路 Zero Shift)Why Choose OrvoKit?
Zero server overhead architecture combined with modern Web APIs ensures ultra-fast throughput and military-grade privacy.
100% Client-Side Privacy
All data stays strictly within your browser. Zero uploads, zero logs, and zero tracking.
Zero Latency Speed
No server roundtrips. Instantaneous real-time execution powered directly by your device's CPU.
Scalable Architecture
Modular registry architecture engineered to house thousands of utility micro-apps effortlessly.
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