Check Digit Calculator: Container OCR API

The High Cost of Invalid Container Data

A single mistyped digit in a container number can disrupt an entire supply chain. The ISO 6346 standard uses a specific mathematical formula to generate a final check digit based on the owner code and serial number. When gate clerks or crane operators manually type these codes, human error inevitably leads to invalid check digits, causing database rejections, lost cargo, and billing disputes. Standard OCR tools merely read text without verifying the math, passing corrupt strings into your system. To see how our engine structurally prevents these errors, you can upload a test image to explore our core Container OCR capabilities completely free.

Algorithmic Verification on the Fly

Delivered strictly as a lightweight REST API to ensure seamless integration without the burden of heavy SDK dependencies, this endpoint is powered by our Logistics Container OCR engine. It acts as an automated gatekeeper for your data. The engine applies strict ISO 6346 validation automatically, calculating the mod-11 check digit in milliseconds to guarantee that only mathematically sound Container Codes enter your logistics software.

Check Digit Application Scenarios

Integration & AI Prompts

Call the endpoint directly via HTTP. The API is designed for maximum security and edge performance, natively accepting direct multipart file uploads or Base64-encoded strings to keep your operations off public URLs.

import requests
import base64

# Prepare Base64 Image to calculate and verify the check digit
with open("container_side_capture.jpg", "rb") as image_file:
    base64_image = base64.b64encode(image_file.read()).decode('utf-8')

url = "https://api.structocr.com/v1/container"
headers = {
    "x-api-key": "YOUR_API_KEY",
    "Content-Type": "application/json"
}
payload = {
    "img": base64_image
}

try:
    print("Calculating Check Digit...")
    response = requests.post(url, headers=headers, json=payload)
    result = response.json()

    if result.get('success'):
        data = result['data']
        parsed = data.get('parsed', {})
        print("✅ Validation Complete!")
        print(f"Full ISO Code:  {data.get('container_number')}")
        print(f"Check Digit:    {parsed.get('check_digit')}")
        print(f"Math Valid:     {data.get('is_valid')}")
        print(f"Confidence:     {data.get('confidence')}")
    else:
        print(f"❌ Calculation Failed: {result.get('error')} - {result.get('message')}")

except Exception as e:
    print(f"An error occurred: {e}")

{
  "success": true,
  "data": {
    "container_number": "ZCSU8921655",
    "is_valid": true,
    "confidence": "High",
    "parsed": {
      "owner_code": "ZCS",
      "category": "U",
      "serial_number": "892165",
      "check_digit": "5"
    }
  }
}