🔬 Automated digital certificate creator & validator with PDF generation
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Description
A complete workflow to create, send, and verify digital certificates fully automated with n8n.Perfect for courses, events, onboarding, internal training, or product education.
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Visit my website for the: full deploy guide
See my Templates on Github: paoloronco/n8n-templates)
✔ 1. Certificate Generation
When a POST webhook request arrives, the workflow:
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reads name, surname, course, and email
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generates a unique Certification ID
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saves everything in the Data Table
✔ 2. Data Storage
Every issued certificate is recorded in an n8n Data Table containing:
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Name
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Surname
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CertificationID
This creates a permanent, searchable certificate registry.
✔ 3. PDF Creation
Uses PDF Generator API to create a professional PDF certificate from an HTML template:
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fully customizable (layout, colors, branding)
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includes candidate data, course, ID, and date
✔ 4. Email Delivery
The workflow automatically sends the certificate to the recipient using Gmail OAuth2 with:
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a predefined subject
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the PDF attached
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a customizable message
✔ 5. Verification System
A public endpoint /certificationscheck allows:
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validation of Certification IDs
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returning the candidate’s name and surname if valid
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responding with
ok: true/false
✔ 6. Included Mini Verification Website
A ready-to-use HTML file allows users to:
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enter a Certification ID
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verify its authenticity
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view name and surname if the certificate exists
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Fully customizable (CSS, texts, branding).
🛠 Requirements
Before using this workflow, you must have:
- n8n Data Table with ID fields:
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Name(string) -
Surname(string) -
CertificationID(string)
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PDF Generator API accountCredentials set in n8n as
pdfGeneratorApi. -
Gmail OAuth2 credentialsConfigured in n8n as
gmailOAuth2. -
Ability to call HTTP POST endpoints from your website, backend, forms, etc.
🚀 Installation
1. Import workflow
In n8n:
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Go to Workflows → Import
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Paste the JSON provided in this repository
2. Configure Data Table
Update the following nodes to point to your Data Table:
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Insert_Certificaton -
Find_Certification_By_ID -
Find_Certification_By_ID1
Make sure the Data Table has the fields:
| Field | Type |
|---|---|
| Name | string |
| Surname | string |
| CertificationID | string |
3. Configure Credentials
In the workflow:
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Node Generate_PDF → set PDF Generator API credentials
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Node Email_Certification → set Gmail OAuth2 credentials
4. Activate Workflow
Click Activate in n8n.
🔧 How the Workflow Works
🧩 1. Webhook /certifications
Receives candidate data and triggers the workflow.
POST https://YOUR-N8N-DOMAIN.com/webhook/certification Headers: name: John surname: Doe course: email: john.doe@example.com
🧩 2. Unique ID Generation
A Code node creates a random alphanumeric ID.If it already exists, a new one is generated.
🧩 3. Data Table Insert
Stores the certificate data for future lookup.
🧩 4. PDF Generation
Builds a PDF from the (fully editable) HTML template.
🧩 5. Email Sending
Delivers the certificate to the candidate.
🔍 Certificate Verification (/certificationscheck)
API Behavior
Send a POST request https://YOUR-N8N-DOMAIN.com/webhook/certificationcheck with header id: CERTIFICATION-ID.
Valid ID:
{ "ok": "true", "name": "John", "surname": "Doe" }
Invalid ID:
{ "ok": "false" }
This request can be made manually (from tools like Postman, cURL, or your backend), or automatically through the HTML verification page included in the GitHub repository (the Cerification_Check.html template) found in your project files
🔗 Nodes Used
Webhook, Gmail, Data table
📥 Import
Download workflow.json and import into n8n:
Workflow menu → Import from File