# Ultitools — Comprehensive System & Architectural Specification (llms-full.txt)
> Complete machine-readable reference for AI agents, generative search engines (Perplexity, ChatGPT Search, Claude, Google AI Overviews), and developers.
> Developed and copyrighted by Aug27 Studio.

## 1. Executive Summary
Ultitools is an in-browser utility suite providing 49 tools across developer utilities, financial & everyday calculators, image editing, document conversion, and video/audio transcoding. 
The system operates on a strict **Quality First** standard, with all processing executing entirely on the client's device using WebAssembly (Wasm), Web Workers, and HTML5 Canvas.

### Architectural Invariants:
1. **Zero Cloud Uploads:** No user file, document, image, or text snippet is ever transmitted to a remote server.
2. **Quality First:** 4K video upscaling uses Lanczos-3 Sinc filters and CRF 18 visually lossless encoding; image scaling uses progressive 2-stage buffers with adaptive Laplacian edge recovery.
3. **Memory Safety:** Hardware GPU OOM bounds protect the browser from crashing (max export edge: 8,000 pixels).
4. **Offline Capability:** Built-in offline exchange rates, offline conversion logic, and cached WebAssembly modules ensure functionality without continuous internet connectivity.

## 2. Tools Index & Specifications

### 2.1 Developer, Text & Calculator Tools (28 Tools)

1. **Code Formatter & Validator Studio (`code-studio`)**
   - URL: https://ultitools.app/tools/code-formatter-validator/
   - Engine: Client-side Prettier AST parser
   - Supported Languages: JSON, JavaScript, TypeScript, HTML, CSS, SQL, Markdown
   - Output: Beautified, minified, or syntax-diagnosed code with exact line/column indicators.

2. **Delimiter & List Separator (`delimiter-converter`)**
   - URL: https://ultitools.app/tools/delimiter-converter/
   - Engine: Client-side regex and string stream tokenizer
   - Features: Convert between commas, spaces, newlines, tabs, and custom dynamic delimiters; single/double quoting, deduplication, natural sorting, bracket wrapping for SQL IN and JSON arrays.

3. **Currency Converter & Exchange Rates (`currency-converter`)**
   - URL: https://ultitools.app/tools/currency-converter/
   - Currencies: 32+ world currencies (USD, EUR, GBP, JPY, INR, CAD, AUD, CHF, etc.)
   - Features: Real-time public API updates, offline cached baseline rates, conversion comparison matrix, inverse rates, custom rate overrides.

4. **Timezone Converter & Meeting Planner (`timezone-converter`)**
   - URL: https://ultitools.app/tools/timezone-converter/
   - Engine: Native ECMAScript Intl & IANA Time Zone Database
   - Features: Daylight Saving Time (DST) calculation, visual 24-hour timeline with working hours status badges (work/early/sleep), one-click formatted meeting invitation export.

5. **Income & Sales Tax Calculator (`tax-calculator`)**
   - URL: https://ultitools.app/tools/tax-calculator/
   - Jurisdictions: United States (Federal + FICA), United Kingdom (Personal Allowance + NI), Canada (Federal + CPP/EI), Australia (Stage 3 + Medicare), Germany, and India (New Regime slabs + Cess).
   - Features: Salary take-home net pay breakdown (annual, monthly, bi-weekly, weekly), marginal/effective tax rates, tax-inclusive and exclusive Sales Tax / VAT / GST.

6. **Loan & Mortgage Interest Calculator (`loan-calculator`)**
   - URL: https://ultitools.app/tools/loan-calculator/
   - Engine: Standard compound amortization formula
   - Features: Monthly payment (EMI), principal vs interest ratio chart, extra monthly payments time/interest savings calculation, full month-by-month amortization schedule with CSV export.

7. **Universal Unit Converter (`unit-converter`)**
   - URL: https://ultitools.app/tools/unit-converter/
   - Dimensions: 8 categories: Digital Storage (Bytes to PiB, binary KiB/MiB/GiB), Length, Mass/Weight, Temperature (°C, °F, K, °R), Volume, Area, Speed, Time.
   - Features: Real-time bidirectional conversion matrix across all units in category with one-click copy.

8. **Compound Interest & SIP Wealth Calculator (`investment-calculator`)**
   - URL: https://ultitools.app/tools/investment-calculator/
   - Compounding: Daily, monthly, quarterly, semi-annually, annually
   - Features: Initial balance + monthly SIP contributions, inflation-adjusted real purchasing power, year-by-year milestone table, CSV spreadsheet export.

9. **Date Difference, Age & Business Days (`date-calculator`)**
   - URL: https://ultitools.app/tools/date-calculator/
   - Modes: Date Difference, Add/Subtract intervals, Exact Chronological Age.
   - Features: Excludes weekend non-working days, counts exact business days, birthday countdowns, leap year normalization.

10. **JWT Debugger & Inspector (`jwt-debugger`)**
    - URL: https://ultitools.app/tools/jwt-debugger/
    - Standards: Base64URL RFC-7519 decoding with WebCrypto SubtleCrypto verification.
    - Features: Color-coded header/payload/signature, expiration status countdown badge, local HMAC SHA-256 (HS256, HS384, HS512) secret verification with zero token network transmission.

11. **Cron Expression Generator & Explainer (`cron-generator`)**
    - URL: https://ultitools.app/tools/cron-generator/
    - Format: Standard 5-part Unix cron (minute, hour, dom, month, dow).
    - Features: Visual schedule builder, plain natural English translations, next 5 execution forecasts evaluated in local browser timezone.

12. **SQL Formatter & Minifier (`sql-formatter`)**
    - URL: https://ultitools.app/tools/sql-formatter/
    - Dialects: PostgreSQL, MySQL, SQLite, Google BigQuery, T-SQL, ANSI SQL.
    - Features: Auto-indentation (2 spaces, 4 spaces, tab), uppercase keywords transform, comment stripping, minification.

13. **JSON Formatter / Validator (`json`)**
    - URL: https://ultitools.app/tools/json-formatter/
    - Features: Syntax tree validation, 2-space / 4-space indentation, JSON repair.

14. **Code Formatter / Prettifier (`code`)**
    - URL: https://ultitools.app/tools/code-formatter/

15. **HTML Formatter (`html`)**
    - URL: https://ultitools.app/tools/html-formatter/

16. **CSS Formatter (`css`)**
    - URL: https://ultitools.app/tools/css-formatter/

17. **JavaScript Formatter (`javascript`)**
    - URL: https://ultitools.app/tools/javascript-formatter/

18. **Base64 Encoder / Decoder (`base64`)**
    - URL: https://ultitools.app/tools/base64-encoder-decoder/
    - Invariant: Lossless UTF-8 character encoding and decoding.

19. **URL Encoder / Decoder (`url`)**
    - URL: https://ultitools.app/tools/url-encoder-decoder/

20. **UUID Generator (`uuid`)**
    - URL: https://ultitools.app/tools/uuid-generator/
    - Standard: RFC-4122 Version 4 cryptographically secure pseudo-random numbers.

21. **Password Generator (`password`)**
    - URL: https://ultitools.app/tools/password-generator/

22. **Hash Generator & Verifier (`hash`)**
    - URL: https://ultitools.app/tools/hash-generator-verifier/
    - Algorithms: SHA-256, SHA-512, SHA-384, SHA-1, MD5, CRC-32.
    - Verification: Case-insensitive hash matching.

23. **Markdown Previewer (`markdown`)**
    - URL: https://ultitools.app/tools/markdown-previewer/

24. **Regex Tester (`regex`)**
    - URL: https://ultitools.app/tools/regex-tester/

25. **Text Diff Checker (`diff`)**
    - URL: https://ultitools.app/tools/text-diff-checker/

26. **Word & Character Counter (`counter`)**
    - URL: https://ultitools.app/tools/word-character-counter/

27. **Case Converter (`case`)**
    - URL: https://ultitools.app/tools/case-converter/

28. **Timestamp Converter (`timestamp`)**
    - URL: https://ultitools.app/tools/timestamp-converter/

### 2.2 Images & Design Tools (16 Tools)

29. **Image Enhancer & 4K Upscaler (`image-enhancer`)**
    - URL: https://ultitools.app/tools/image-enhancer/
    - Algorithm: Progressive 2-stage scaling (1x -> 2x -> 4x) with Laplacian edge recovery ($1 + 4s$ center, $-s$ edges).
    - Features: Auto-enhance presets, background removal, split comparison slider.
    - Memory Bounds: Max edge: 8,000px, Max pixels: 40,000,000.

30. **Word to PDF Converter (`word-to-pdf`)**
    - URL: https://ultitools.app/tools/word-to-pdf/
    - Engine: Client-side OpenXML parser + jsPDF vector engine.
    - Preserves: Headings, paragraph styles, bullet lists, tables, embedded imagery.

31. **PowerPoint to PDF Converter (`ppt-to-pdf`)**
    - URL: https://ultitools.app/tools/powerpoint-to-pdf/
    - Preserves: 16:9 widescreen and 4:3 slide geometry, slide numbers, text notes.

32. **PDF to Word Converter (`pdf-to-word`)**
    - URL: https://ultitools.app/tools/pdf-to-word/

33. **PDF Compressor & Optimizer (`pdf-compress`)**
    - URL: https://ultitools.app/tools/pdf-compressor/

34. **PDF Converter & Generator (`pdf-converter`)**
    - URL: https://ultitools.app/tools/pdf-converter/

35. **OCR Image & Scan to Text (`ocr-text`)**
    - URL: https://ultitools.app/tools/ocr-image-to-text/
    - Engine: Tesseract.js compiled to WebAssembly in a Web Worker.

36. **Zip Archive Manager (`archive-converter`)**
    - URL: https://ultitools.app/tools/zip-archive-manager/
    - Compression: Deflate level 1 to 9 with integrity checking.

37. **Webpage & HTML Screenshot (`capture-website`)**
    - URL: https://ultitools.app/tools/capture-website-screenshot/

38. **QR Code Generator (`qr`)**
    - URL: https://ultitools.app/tools/qr-code-generator/

39. **Image Compressor (`image-compress`)**
    - URL: https://ultitools.app/tools/image-compressor/

40. **Image Resizer (`image-resize`)**
    - URL: https://ultitools.app/tools/image-resizer/

41. **Image Cropper (`image-crop`)**
    - URL: https://ultitools.app/tools/image-cropper/

42. **Image Format Converter (`image-convert`)**
    - URL: https://ultitools.app/tools/image-format-converter/

43. **SVG Optimizer (`svg-optimize`)**
    - URL: https://ultitools.app/tools/svg-optimizer/

44. **Color Picker & Converter (`color`)**
    - URL: https://ultitools.app/tools/color-picker-converter/

### 2.3 Video & Audio Tools (5 Tools)

45. **4K Video Scaler & Converter (`video-convert`)**
    - URL: https://ultitools.app/tools/video-format-converter/
    - Engine: FFmpeg compiled to WebAssembly
    - Scaling Filter: `scale=-2:<height>:flags=lanczos` (Lanczos-3 Sinc)
    - CRF Curves: 4K = CRF 18, 1440p = CRF 19, 1080p = CRF 20, 720p = CRF 22
    - Audio: 256k AAC for 4K, 192k AAC for 1080p
    - Streaming: `-movflags +faststart` ensures instant browser playback.

46. **Device & Social Media Video Converter (`device-converter`)**
    - URL: https://ultitools.app/tools/device-video-converter/
    - Presets: Instagram Reels (9:16 padded Lanczos), TikTok (9:16), YouTube 4K, Discord (<10MB target cap).

47. **Video Compressor (`video-compress`)**
    - URL: https://ultitools.app/tools/video-compressor/

48. **Audio Converter (`audio-convert`)**
    - URL: https://ultitools.app/tools/audio-converter/
    - Supports: MP3, WAV, AAC, FLAC (lossless), OGG.

49. **Video Downloader & Stream Inspector (`video-downloader`)**
    - URL: https://ultitools.app/tools/video-downloader/

## 3. Copyright and Provenance
© 2026 Ultitools. All intellectual property, trademarks, and design architecture reserved by Aug27 Studio.
For inquiries: https://aug27.studio