# KaruviLab

> KaruviLab is a privacy-first, zero-server-upload collection of local browser tools. This document provides instructions and metadata for AI Agents navigating the site.

## Navigation & Architecture
- The site uses Next.js with React 19.
- Tools execute locally in the browser using WebAssembly and Web Workers. No files are uploaded to servers.
- The UI follows WCAG 2.2 AA accessibility standards.

## Available Tools

- [Aes Encrypt Decrypt](https://karuvilab.com/security-tools/aes-encrypt-decrypt/): Encrypt and decrypt text or files using AES, entirely in your browser.
- [Age Calculator](https://karuvilab.com/calculators/age-calculator/): Calculate age in years, months, and days
- [Audio Converter](https://karuvilab.com/media-tools/audio-converter/): Convert audio files between formats like MP3 and WAV locally for compatibility.
- [Banking Tools](https://karuvilab.com/developer-tools/banking-tools/): Advanced financial data parsers for EMV, SWIFT, and core banking logs
- [Barcode & QR Scanner](https://karuvilab.com/utilities/barcode-scanner/): Scan barcodes and QR codes using camera
- [Base64 Encode/Decode](https://karuvilab.com/developer-tools/base64/): Encode or decode Base64 strings
- [Base64url Converter](https://karuvilab.com/security-tools/base64url-converter/): Encode or decode text to URL-safe Base64 format to safely transmit data.
- [Background Remover](https://karuvilab.com/image-tools/bg-remover/): Remove image backgrounds locally
- [Bmi Calculator](https://karuvilab.com/calculators/bmi-calculator/): Calculate your Body Mass Index (BMI) and health category to track fitness goals.
- [Box Shadow Generator](https://karuvilab.com/developer-tools/box-shadow-generator/): Design CSS box shadows visually and copy clean CSS snippets for layouts.
- [Bulk Image Resize](https://karuvilab.com/image-tools/bulk-resizer/): Resize many images at once
- [CAGR Calculator](https://karuvilab.com/calculators/cagr-calculator/): Compound Annual Growth Rate
- [Calculator](https://karuvilab.com/calculators/calculator/): Unified calculator with seamless standard and scientific modes
- [Calendar](https://karuvilab.com/productivity/calendar/): Professional, local-first calendar with Tamil mode support.
- [Card Masker](https://karuvilab.com/security-tools/card-masker/): Mask card numbers automatically to securely display and store sensitive financial info.
- [Chart & Graph Generator](https://karuvilab.com/productivity/chart-generator/): Create beautiful charts from your data
- [Cipher Tools](https://karuvilab.com/security-tools/cipher-tools/): Encrypt and decrypt text using classical ciphers like Caesar or Vigenère.
- [Code Minifier](https://karuvilab.com/developer-tools/code-minifier/): Minify CSS, JS, and HTML
- [Color Converter](https://karuvilab.com/developer-tools/color-converter/): Convert color formats (HEX, RGB, HSL) to style web applications.
- [Color Match](https://karuvilab.com/break-time-tools/color-match/): Pick the exact color swatch under time pressure to test your visual accuracy.
- [Color Palette Extractor](https://karuvilab.com/image-tools/color-palette-extractor/): Extract dominant color palettes from any image to design themes.
- [Command Cheat Sheet](https://karuvilab.com/developer-tools/command-cheat-sheet/): Look up development and system commands instantly to speed up your workflow.
- [Compound Interest Calculator](https://karuvilab.com/calculators/compound-interest/): Calculate compounded growth on your investment.
- [Compress PDF](https://karuvilab.com/pdf-tools/compress-pdf/): Reduce PDF file size
- [Compress](https://karuvilab.com/image-tools/compress/): Bundle files and folders into optimized ZIP archives to save storage space.
- [Contrast Checker](https://karuvilab.com/developer-tools/contrast-checker/): Verify background and foreground contrast to meet WCAG accessibility standards.
- [Core Banking Parser](https://karuvilab.com/banking-tools/core-banking-parser/): Parse core banking trace logs into JSON
- [Countdown Timer](https://karuvilab.com/productivity/countdown-timer/): Set timers for upcoming milestones or deadlines to keep track of tasks.
- [Crontab Editor](https://karuvilab.com/developer-tools/crontab-editor/): Build crontab expressions visually and translate them to plain English.
- [Csp Builder](https://karuvilab.com/security-tools/csp-builder/): Construct secure Content Security Policy headers to protect sites from XSS.
- [Csr Generator](https://karuvilab.com/security-tools/csr-generator/): Generate CSR requests and private keys locally to secure web servers.
- [Csv To Json](https://karuvilab.com/developer-tools/csv-to-json/): Convert tabular CSV file content into structured JSON objects.
- [Currency Converter](https://karuvilab.com/calculators/currency-converter/): Convert between world currencies
- [Data Calculator](https://karuvilab.com/calculators/data-calculator/): Units, transfer time, cost, & hashes
- [Date Calculator](https://karuvilab.com/calculators/date-calculator/): Add, subtract, or diff dates
- [Diff Checker](https://karuvilab.com/developer-tools/diff-checker/): Compare two text snippets
- [Directory Manifest](https://karuvilab.com/security-tools/directory-manifest/): Generate recursive folder maps of local directories to document structure.
- [Discount Calculator](https://karuvilab.com/calculators/discount-calculator/): Find sale price and savings
- [Ecdh Key Exchange](https://karuvilab.com/security-tools/ecdh-key-exchange/): Generate shared cryptographic keys using ECDH protocols.
- [Ecdsa Sign](https://karuvilab.com/security-tools/ecdsa-sign/): Sign and verify payload strings using secure ECDSA certificates.
- [EMI Calculator](https://karuvilab.com/calculators/emi-calculator/): Loan EMI, interest, and amortization
- [Emv Tlv Tree](https://karuvilab.com/banking-tools/emv-tlv-tree/): Inspect and parse EMV TLV payment packets for bank transaction analysis.
- [Extract Images](https://karuvilab.com/pdf-tools/extract-images/): Pull images out of a PDF
- [Fake Data Generator](https://karuvilab.com/developer-tools/fake-data-generator/): Generate realistic fake data for testing
- [Fixed Deposit (FD)](https://karuvilab.com/calculators/fd-calculator/): FD maturity amount and interest earned
- [File Viewer & Diff](https://karuvilab.com/file-tools/file-viewer-diff/): Local text editor and diff checker
- [Financial Freedom Calculator](https://karuvilab.com/calculators/financial-freedom-calculator/): Calculate your path to FIRE and plan your retirement.
- [Code Formatter](https://karuvilab.com/developer-tools/format/): Auto-format code in many languages
- [2048](https://karuvilab.com/break-time-tools/game-2048/): Slide and merge tiles to reach 2048. Addictive puzzle game — fully offline.
- [Gif Creator](https://karuvilab.com/media-tools/gif-creator/): Convert videos or image frames into optimized, loopable animated GIF files.
- [Glassmorphism Generator](https://karuvilab.com/developer-tools/glassmorphism-generator/): Generate CSS code for modern frosted-glass card designs.
- [Gradient Generator](https://karuvilab.com/developer-tools/gradient-generator/): Design linear and radial CSS gradients visually for backgrounds.
- [Grammar Checker](https://karuvilab.com/utilities/grammar-checker/): Spot common writing errors
- [Gratuity Calculator](https://karuvilab.com/calculators/gratuity-calculator/): Estimate standard gratuity benefits based on salary and tenure.
- [GST Calculator](https://karuvilab.com/calculators/gst-calculator/): Calculate GST (Add/Remove) for Indian tax slabs (5%, 12%, 18%, 28%) with CGST, SGST, and IGST breakdown.
- [Hash Generator](https://karuvilab.com/security-tools/hash-generator/): MD5, SHA-1/256/512 hashes
- [Hash Map Visualizer](https://karuvilab.com/developer-tools/hash-map-visualizer/): Visualize collision resolution strategies in hash map indexes.
- [Hkdf Generator](https://karuvilab.com/security-tools/hkdf-generator/): Derive cryptographically strong keys from raw input using HKDF.
- [Hmac Generator](https://karuvilab.com/security-tools/hmac-generator/): Calculate keyed-hash message authentication codes (HMAC) to verify integrity.
- [Hra Calculator](https://karuvilab.com/calculators/hra-calculator/): Calculate your House Rent Allowance tax exemptions.
- [HTML Entities](https://karuvilab.com/security-tools/html-entities/): Convert characters to HTML entities
- [HTML Online Viewer](https://karuvilab.com/developer-tools/html-viewer/): Professional live HTML/CSS/JS editor and sandboxed preview
- [Iban Validator](https://karuvilab.com/security-tools/iban-validator/): Check the validity and checksums of IBAN bank account numbers.
- [Image to Base64](https://karuvilab.com/image-tools/image-base64/): Encode images as Base64 data URIs
- [Image Compressor](https://karuvilab.com/image-tools/image-compressor/): Reduce image file size
- [Image Converter](https://karuvilab.com/image-tools/image-converter/): Convert between JPG, PNG, WebP, AVIF, and BMP
- [Image Crop](https://karuvilab.com/image-tools/image-crop/): Crop images to ratio or freeform
- [Image Resizer](https://karuvilab.com/image-tools/image-resizer/): Resize images to exact dimensions
- [Image Seo](https://karuvilab.com/seo-tools/image-seo/): Optimize image file names and alt attributes to rank higher on search engines.
- [Image to PDF](https://karuvilab.com/pdf-tools/image-to-pdf/): Convert images into a single PDF
- [Income Tax](https://karuvilab.com/calculators/income-tax/): Calculate annual income tax estimates and select the best tax regime.
- [Inflation Calculator](https://karuvilab.com/calculators/inflation-calculator/): Purchasing power over time
- [Speed Tester](https://karuvilab.com/utilities/internet-speed-test/): Measure your internet connection speed
- [Invoice Generator](https://karuvilab.com/calculators/invoice-generator/): Build professional custom invoices and download them as PDFs.
- [Iso8583 Bitmap Decoder](https://karuvilab.com/security-tools/iso8583-bitmap-decoder/): Parse and visualize ISO 8583 payment card transaction bitmaps.
- [Iso8583 Message Parser](https://karuvilab.com/security-tools/iso8583-message-parser/): Decode raw financial transaction strings into human-readable messages.
- [JSON ↔ CSV](https://karuvilab.com/developer-tools/json-csv/): Convert between JSON and CSV
- [JSON Formatter](https://karuvilab.com/developer-tools/json-formatter/): Format and validate JSON
- [JSON to TypeScript](https://karuvilab.com/developer-tools/json-to-ts/): Generate TypeScript interfaces from JSON
- [JWT Decoder](https://karuvilab.com/security-tools/jwt-decoder/): Inspect JSON Web Tokens
- [Lock / Unlock PDF](https://karuvilab.com/pdf-tools/lock-unlock/): Add or remove PDF passwords
- [Log Analyzer](https://karuvilab.com/developer-tools/log-analyzer/): Analyze and filter server and application access log files.
- [Lorem Ipsum](https://karuvilab.com/developer-tools/lorem-ipsum/): Generate custom dummy placeholder text for layouts and copy.
- [Luhn Validator](https://karuvilab.com/developer-tools/luhn-validator/): Check identification card numbers using the Luhn checksum algorithm.
- [Lumpsum Calculator](https://karuvilab.com/calculators/lumpsum-calculator/): Future value of one-time investment
- [Markdown Editor](https://karuvilab.com/utilities/markdown/): Professional Markdown editor with live GitHub-style preview, Mermaid diagrams, and high-performance export options.
- [Memory Match](https://karuvilab.com/break-time-tools/memory-match/): Flip cards and match pairs. A classic memory-training game with best-score tracking.
- [Merge PDF](https://karuvilab.com/pdf-tools/merge-pdf/): Combine multiple PDFs into one
- [Meta Tags](https://karuvilab.com/seo-tools/meta-tags/): Generate and preview HTML meta tags to optimize website social sharing.
- [Mic & Camera Tester](https://karuvilab.com/utilities/mic-camera-tester/): Test your microphone and camera
- [Minesweeper](https://karuvilab.com/break-time-tools/minesweeper/): Classic Minesweeper puzzle. Clear the board without clicking on hidden mines. Multiple difficulties and mobile friendly controls.
- [Mutual Fund Returns](https://karuvilab.com/calculators/mutual-fund-returns/): Calculate absolute and annualized returns
- [Nanoid Generator](https://karuvilab.com/developer-tools/nanoid-generator/): Generate secure, URL-friendly unique string IDs using NanoID.
- [Notes](https://karuvilab.com/productivity/notes/): Write and save markdown notes locally in your browser.
- [Nps Calculator](https://karuvilab.com/calculators/nps-calculator/): Calculate National Pension Scheme (NPS) maturity amounts.
- [Numeral & Encoding Converter](https://karuvilab.com/calculators/numeral-converter/): Universal encoding converter. Paste hex, binary, Base64, URL-encoded, HTML entities, Unicode escapes, or plain text. Auto-detect format and convert to all others instantly. Supports UTF-8, UTF-16, UTF-32, Base64, URL encoding, HTML entities, JavaScript/Python/CSS escapes, Morse code, ROT13, JWT decode, and more. 100% local — nothing leaves your browser.
- [Oauth Token Decoder](https://karuvilab.com/security-tools/oauth-token-decoder/): Inspect and decode OAuth 2.0 access and refresh token payloads.
- [Og Preview](https://karuvilab.com/seo-tools/og-preview/): Preview Open Graph card layouts for social media platforms.
- [Page Numbering](https://karuvilab.com/pdf-tools/page-numbering/): Add page numbers to PDF
- [Password Generator](https://karuvilab.com/security-tools/password-generator/): Strong, random passwords
- [Pbkdf2 Generator](https://karuvilab.com/security-tools/pbkdf2-generator/): Derive cryptographic keys using PBKDF2 password hashing.
- [PDF to Image](https://karuvilab.com/pdf-tools/pdf-to-image/): Convert PDF pages to JPG or PNG images
- [PDF to Word](https://karuvilab.com/pdf-tools/pdf-to-word/): Convert PDF text to editable Word
- [Pem Viewer](https://karuvilab.com/security-tools/pem-viewer/): Inspect and parse PEM certificate and private key files.
- [Percentage Calculator](https://karuvilab.com/calculators/percentage-calculator/): Find percentages and ratios
- [Phone Mockup Generator](https://karuvilab.com/image-tools/phone-mockup-generator/): Wrap screenshots in realistic device frames
- [Pomodoro Timer](https://karuvilab.com/productivity/pomodoro-timer/): Boost your focus and productivity using the Pomodoro technique.
- [PPF Calculator](https://karuvilab.com/calculators/ppf-calculator/): Public Provident Fund maturity & interest
- [Private Key Checker](https://karuvilab.com/security-tools/private-key-checker/): Validate private key structures and format compatibility.
- [Public Key Inspector](https://karuvilab.com/security-tools/public-key-inspector/): Inspect and display properties of public keys.
- [QR Code Generator](https://karuvilab.com/utilities/qrcode/): Make QR codes for URLs, text, Wi-Fi
- [Recurring Deposit (RD)](https://karuvilab.com/calculators/rd-calculator/): RD maturity and interest calculation
- [Reaction Time Test](https://karuvilab.com/break-time-tools/reaction-time/): Test your reflexes and measure your reaction speed in milliseconds.
- [Regex Tester](https://karuvilab.com/developer-tools/regex/): Test regular expressions live
- [Retirement Planner](https://karuvilab.com/calculators/retirement-calculator/): Corpus needed for your retirement
- [Robots Txt](https://karuvilab.com/seo-tools/robots-txt/): Generate and validate robots.txt configurations for SEO crawlers.
- [Rotate PDF](https://karuvilab.com/pdf-tools/rotate-pdf/): Rotate one or all pages
- [Rsa Encrypt Decrypt](https://karuvilab.com/security-tools/rsa-encrypt-decrypt/): Encrypt or decrypt payloads using secure RSA key pairs.
- [Rsa Key Generator](https://karuvilab.com/security-tools/rsa-key-generator/): Generate public and private RSA key pairs locally for authentication.
- [Rsa Sign Verify](https://karuvilab.com/security-tools/rsa-sign-verify/): Sign messages or verify signatures using RSA keys.
- [Safe-to-Spend](https://karuvilab.com/calculators/safe-to-spend/): Daily budget planner
- [Salary Calculator](https://karuvilab.com/calculators/salary-calculator/): Indian take-home salary breakdown
- [Saml Decoder](https://karuvilab.com/security-tools/saml-decoder/): Decode and format SAML assertion payloads for identity analysis.
- [Seo Title](https://karuvilab.com/seo-tools/seo-title/): Optimize SEO title tags to maximize search engine click-through rates.
- [Seo Tools](https://karuvilab.com/developer-tools/seo-tools/): Inspect and optimize website SEO meta tags and preview search snippets.
- [SIP Calculator](https://karuvilab.com/calculators/sip-calculator/): Project mutual-fund SIP returns
- [Sitemap Generator](https://karuvilab.com/seo-tools/sitemap-generator/): Generate XML sitemaps to index website pages.
- [Slug Generator](https://karuvilab.com/seo-tools/slug-generator/): Convert text into URL-friendly slug strings.
- [Smart Unit Converter](https://karuvilab.com/calculators/smart-converter/): Natural-language unit conversion
- [Snake Game](https://karuvilab.com/break-time-tools/snake-game/): Play the classic retro Snake game. Eat food, grow longer, and set new high scores entirely in your browser.
- [Split & Copy](https://karuvilab.com/utilities/split-copy/): Break long text into chunks
- [Split PDF](https://karuvilab.com/pdf-tools/split-pdf/): Extract pages from a PDF
- [Sql Formatter](https://karuvilab.com/developer-tools/sql-formatter/): Beautify and format complex SQL queries to improve readability.
- [Stock Average](https://karuvilab.com/calculators/stock-average-calculator/): Weighted average buy price for stocks
- [Stopwatch](https://karuvilab.com/productivity/stopwatch/): Track elapsed time with lap support for productivity logging.
- [Sudoku](https://karuvilab.com/break-time-tools/sudoku/): Classic 9x9 Sudoku logical number placement puzzle with multiple difficulty modes, hints, and local best times.
- [Swift Mt Mx](https://karuvilab.com/banking-tools/swift-mt-mx/): Parse and inspect SWIFT MT and MX banking message structures.
- [SWP Calculator](https://karuvilab.com/calculators/swp-calculator/): Systematic Withdrawal Plan planning
- [Task Reminder](https://karuvilab.com/utilities/task-reminder/): Lightweight private to-do list
- [Tds Calculator](https://karuvilab.com/calculators/tds-calculator/): Calculate Tax Deducted at Source (TDS) percentages.
- [Text Case Converter](https://karuvilab.com/productivity/text-case-converter/): Convert text between UPPERCASE, lowercase, and sentence case styles.
- [Text Sorter & Deduplicator](https://karuvilab.com/productivity/text-sorter-deduper/): Sort and remove duplicates from text
- [Text Utility](https://karuvilab.com/utilities/text-utility/): Clean, case convert, count words
- [Tic-Tac-Toe](https://karuvilab.com/break-time-tools/tic-tac-toe/): Classic 2-player Tic-Tac-Toe right in your browser. No downloads, no sign-in.
- [Time Calculator](https://karuvilab.com/calculators/time-calculator/): Add or subtract hours and minutes
- [Time Zone Converter](https://karuvilab.com/productivity/timezone-converter/): Compare and convert time between multiple global time zones. Real-time offsets and DST support.
- [Tlv Parser](https://karuvilab.com/security-tools/tlv-parser/): Parse and visualize EMV TLV hex streams into clear tree structures.
- [Track 2 Parser](https://karuvilab.com/banking-tools/track-2-parser/): Decode magnetic stripe Track 2 data for payment card testing.
- [Typing Speed Test](https://karuvilab.com/productivity/typing-speed-test/): Test and improve your typing WPM
- [Unit Converter](https://karuvilab.com/calculators/unit-converter/): Length, weight, volume, and more
- [Unix Timestamp](https://karuvilab.com/developer-tools/unix-timestamp/): Convert between epoch timestamps and human-readable dates.
- [URL Cleaner](https://karuvilab.com/utilities/url-cleaner/): Strip tracking parameters
- [URL Encoder](https://karuvilab.com/developer-tools/url-encoder/): Percent-encode and decode URLs
- [UTC ↔ IST](https://karuvilab.com/calculators/utc-ist-converter/): Convert between UTC and IST
- [Uuid Generator](https://karuvilab.com/developer-tools/uuid-generator/): Generate secure v4 UUIDs for database and entity keys.
- [File Validator](https://karuvilab.com/utilities/validate/): Validate file size and type
- [Video Metadata Viewer](https://karuvilab.com/media-tools/video-metadata-viewer/): Extract and inspect resolution, codec, and duration metadata from video files.
- [Video Trim](https://karuvilab.com/media-tools/video-trim/): Trim and cut MP4 video clips directly in your browser.
- [Watermark PDF](https://karuvilab.com/pdf-tools/watermark-pdf/): Add text or image watermark
- [WiFi QR Code Generator](https://karuvilab.com/productivity/wifi-qr-code/): Generate QR code to connect to WiFi
- [Word Counter](https://karuvilab.com/productivity/word-counter/): Count characters, words, sentences, and reading times for any text.
- [Word Guess](https://karuvilab.com/break-time-tools/word-guess/): A word guessing puzzle game. Find the secret 5-letter word in 6 tries using visual feedback.
- [Word To Pdf](https://karuvilab.com/pdf-tools/word-to-pdf/): Convert Word documents (DOCX) into standard PDF files locally.
- [Work Hours](https://karuvilab.com/calculators/work-hours/): Timesheet and overtime tracker
- [World Clock](https://karuvilab.com/calculators/world-clock/): Track time across multiple cities with business hour indicators. Ideal for global teams.
- [X509 Viewer](https://karuvilab.com/security-tools/x509-viewer/): Inspect and validate X.509 security certificates and expiry details.
- [Xml Formatter](https://karuvilab.com/developer-tools/xml-formatter/): Format and prettify nested XML documents to inspect data tags.
- [Yaml Json Converter](https://karuvilab.com/developer-tools/yaml-json-converter/): Convert between YAML formatting and JSON objects.
- [Yaml Validator](https://karuvilab.com/developer-tools/yaml-validator/): Verify and validate YAML syntax correctness.