ANJ Dual OCR Invoice Parser

Advanced client-side invoice OCR, parsing, export, and history system — powered entirely by browser technologies, no backend required.

Live Demo: https://atorhub.github.io/anj-dual-ocr-parser/

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🚀 Features

🔍 Dual OCR Engine (Image / PDF)

• Quick OCR – fast text extraction for simple bills
• Enhanced OCR – high-accuracy deep recognition
• PDF Support via pdf.js
• Automatic merge of both OCR passes for improved accuracy

🧠 Smart Invoice Parsing

Automatically extracts:

• Merchant / Shop name
• Invoice date
• Total amount + currency detection
• Line items: name, qty, price, total
• Category detection (Food, Shopping, Finance, etc.)
• Auto-corrections (date fixes, currency normalization)
• Issue detection & confidence scoring

🖼 Preview Panels

• Extracted fields
• Items table
• Raw OCR text
• Cleaned text
• JSON structured output
• Issues & corrections viewer

📦 Export System

Export parsed invoices as:

• JSON
• TXT
• CSV
• PDF (with preview capture)
• ZIP bundle (JSON + TXT + CSV + Preview PNG)

🗃 IndexedDB History

• Save every parsed invoice locally
• Reload instantly from history
• Clear all saved invoices
• 100% offline and persistent

🎨 Premium UI Themes

Includes 6 animated / pastel / galaxy themes:

1. Rose Nebula
2. Lilac Glow
3. Cotton Candy Sky
4. Galaxy Glitter
5. Dreamy Blush
6. Fairy Dust

Themes are selectable and saved automatically.

📱 100% Client-Side & Offline-Ready

• No servers
• No API keys
• No payments
• No privacy issues
  Runs fully in-browser using:
• pdf.js
• Tesseract.js
• IndexedDB
• html2canvas
• jsPDF
• JSZip

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🧩 How It Works

1) OCR Phase

• If PDF → converted to text with pdf.js
• If Image → processed with Tesseract.js
• Quick + Enhanced OCR → combined

2) Parsing Phase

Custom rule engine detects:

• Date formats (DD/MM/YYYY, YYYY-MM-DD, etc.)
• Totals (₹, Rs, $, €, £ detection)
• Item rows with qty/price
• Corrects decimals, removes noise, fixes broken lines

3) Validation Phase

Checks for:

• Missing totals
• Invalid dates
• Mangled characters (e.g., “₹” → “Rs”)
• Bad line items

4) UI Rendering

All preview sections update instantly.

5) Export System

Data converts into:

• JSON (structured)
• TXT (raw)
• CSV (Excel friendly)
• PDF (visual snapshot)
• ZIP (bundle)

6) History Persistence

Saved via IndexedDB with:

• Merchant
• Date
• Total
• Items
• Raw text
• Corrections

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📁 Project Structure