📌 Local Certificate Image Generator

Instant Shareable Certificate Images for Moodle

🧩 What This Plugin Does

This plugin automatically converts Moodle Custom Certificate PDFs into images and provides a public share link, allowing learners to showcase their certificates instantly.

✔ Key Features

• 🖼 Instant Image generation when a learner views their certificate

• 🔗 Share button added directly on certificate view page

• 🌍 Public share link — no login required

• 📱 Works with WhatsApp, Facebook, LinkedIn previews (OG metadata)

• 🧩 No modification to core mod_customcert plugin

• ⚡ No cron needed — real-time processing

• 🛠 Uses Poppler (pdftoppm / pdftocairo) for PDF → Image conversion

• 🔐 Secure: uses random share codes (no personal data in URL)

🛠 Requirements

• Moodle 4.2+

• Custom Certificate plugin installed (mod_customcert)

• Poppler utilities installed
  Check:

  pdftoppm -v
  

📂 Installation

1. Upload the ZIP via:
   Site administration → Plugins → Install plugins

2. Click Continue through validation

3. Purge caches

🚀 How It Works

• User views certificate → PDF is generated by mod_customcert

• Plugin detects PDF and creates an image using Poppler

• Adds a Share Certificate button

• Learner gets a public page to showcase their achievement

Example share link:

https://yourmoodlesite.com/local/certimagegen/certificate.php?code=f4zji20Bho

🎯 Why Use This Plugin?

Give your learners a professional way to:

• Share certificates on LinkedIn

• Send proof on WhatsApp or email

• Display achievements on resumes & portfolios

Just like Coursera, Udemy, LinkedIn Learning — inside Moodle 🎉