# SmartToolPack (smarttoolpack.com)

> SmartToolPack is a suite of 20 high-performance, 100% privacy-first web utilities, calculators, PDF converters, and media processing tools built by GreenCode IT Solutions. All calculations and file operations execute 100% client-side inside the user browser using Web API standards and HTML5 WebAssembly, ensuring zero server data collection or remote file uploads.

## Core Platform Attributes
- Privacy Philosophy: Zero server file uploads, zero telemetry, 100% client-side local browser execution.
- Technology Stack: Next.js App Router, React 19, TypeScript, TailwindCSS, WebAssembly.
- Compliance & Accessibility: WCAG 2.2 AA compliant, fully structured JSON-LD schemas.

## Financial & Tax Calculators
- [Loan EMI & Prepayment Calculator](https://smarttoolpack.com/calculators/loan-emi-calculator): Calculate reducing balance monthly EMIs, partial lump-sum prepayment interest savings, and tenure reduction schedules.
- [SIP & Investment Calculator](https://smarttoolpack.com/calculators/sip-calculator): Model mutual fund Systematic Investment Plan (SIP) returns, annual step-up contribution growth, and long-term wealth accumulation.
- [GST Tax Calculator](https://smarttoolpack.com/calculators/gst-calculator): Calculate inclusive and exclusive Goods and Services Tax (GST) across 5%, 12%, 18%, 28% slabs with CGST/SGST 50/50 splits.
- [Credit Card Payoff Calculator](https://smarttoolpack.com/calculators/credit-card-calculator): Compute credit card APR interest charges, payoff timelines, and compare minimum payment trap vs fixed monthly payoff strategies.

## PDF & Document Utilities
- [PDF Merge & Split Studio](https://smarttoolpack.com/pdf-tools/pdf-merge-split): Merge multiple PDF files into a single unified document or extract specific PDF pages locally without server uploads.
- [PDF Crop & Margin Adjuster](https://smarttoolpack.com/pdf-tools/pdf-crop): Crop page CropBox margins and trim extra whitespace for optimized reading on tablets and Kindle e-readers.
- [PDF Converter Studio](https://smarttoolpack.com/pdf-tools/pdf-converter): Convert JPG/PNG photos and raw text notes into structured PDF files directly in browser memory.

## Media, Graphics & AI Tools
- [Image Resizer & WebP Converter](https://smarttoolpack.com/media-tools/image-resizer): Resize image pixel dimensions and convert JPG/PNG files into high-compression WebP format for Core Web Vitals (LCP) optimization.
- [AI Background Remover](https://smarttoolpack.com/media-tools/background-remover): Isolate photo subjects and erase backgrounds locally to create transparent PNG cutouts for e-commerce products and profile avatars.
- [Color Palette & Contrast Picker](https://smarttoolpack.com/media-tools/color-palette): Extract HEX/RGB color schemes from images and audit text-to-background contrast ratios for WCAG AA (4.5:1) and AAA (7:1) compliance.
- [Aspect Ratio & Resolution Scaler](https://smarttoolpack.com/media-tools/aspect-ratio): Calculate proportional scaling for 16:9 (YouTube), 9:16 (TikTok/Reels), 4:3, 1:1 (Instagram), and 21:9 ultrawide frames.
- [Video Stream Inspector](https://smarttoolpack.com/media-tools/video-downloader): Inspect online media stream bitrates and extract direct HD video (1080p) and MP3 audio stream URLs.

## Daily Utilities & Network Diagnostics
- [Word, Character & Sentence Counter](https://smarttoolpack.com/utilities/word-counter): Analyze text metrics, character limits (Twitter/SEO Meta), paragraph density, and estimated silent reading time (200 WPM).
- [IP Address & Geolocation Inspector](https://smarttoolpack.com/utilities/ip-lookup): Discover assigned public IPv4/IPv6 address, ISP provider, network region, and DNS lookup details.
- [Internet Speed & Latency Meter](https://smarttoolpack.com/utilities/speed-test): Measure Wi-Fi download throughput, upload bandwidth, ping latency (ms), and connection jitter.
- [Age & Date Difference Calculator](https://smarttoolpack.com/utilities/age-calculator): Calculate exact age breakdown in years, months, and days, or calculate difference between custom calendar dates.
- [Universal Unit Converter](https://smarttoolpack.com/utilities/unit-converter): Convert metrics across Length (meters/feet), Weight (kg/lbs), Temperature (°C/°F), Area, and Digital Storage (GB/TB).
- [Time Zone & World Clock](https://smarttoolpack.com/utilities/time-zone-converter): Track real-time clocks and schedule meetings across EST, GMT, UTC, IST, SGT, and PST time zones.

## Security & Productivity Suite
- [Password & QR Code Studio](https://smarttoolpack.com/security/password-qr-generator): Generate entropy-rich random cryptographic passwords (crypto.getRandomValues API) and create scannable vector QR codes.
- [Pomodoro Focus Timer](https://smarttoolpack.com/productivity/pomodoro-timer): Manage 25-minute deep work intervals, short 5-minute breaks, and long rest cycles to prevent cognitive burnout.