Handle Webhook with Image Conversion

The workflow JSON

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{
  "nodes": [
    {
      "id": "c02e3038-96e8-4bfe-a4fa-925207fef0ee",
      "name": "Create data pix",
      "type": "n8n-nodes-base.set",
      "position": [
        220,
        0
      ],
      "parameters": {
        "options": {},
        "assignments": {
          "assignments": [
            {
              "id": "ab15b0f8-c40f-4874-8724-ddae8f99e646",
              "name": "data",
              "type": "string",
              "value": "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAYdEVYdFNvZnR3YXJlAFBhaW50Lk5FVCA1LjEuMvu8A7YAAAC2ZVhJZklJKgAIAAAABQAaAQUAAQAAAEoAAAAbAQUAAQAAAFIAAAAoAQMAAQAAAAIAAAAxAQIAEAAAAFoAAABphwQAAQAAAGoAAAAAAAAAYAAAAAEAAABgAAAAAQAAAFBhaW50Lk5FVCA1LjEuMgADAACQBwAEAAAAMDIzMAGgAwABAAAAAQAAAAWgBAABAAAAlAAAAAAAAAACAAEAAgAEAAAAUjk4AAIABwAEAAAAMDEwMAAAAADp1fY4ytpsegAAAA1JREFUGFdjYGBgYAAAAAUAAYoz4wAAAAAASUVORK5CYII="
            }
          ]
        }
      },
      "typeVersion": 3.4
    },
    {
      "id": "09573a6a-88e8-48c5-a78e-d45fb37a8b87",
      "name": "Create img bin",
      "type": "n8n-nodes-base.convertToFile",
      "position": [
        440,
        0
      ],
      "parameters": {
        "options": {
          "mimeType": "image/png"
        },
        "operation": "toBinary",
        "sourceProperty": "data",
        "binaryPropertyName": "pixel"
      },
      "typeVersion": 1.1
    },
    {
      "id": "07c42dab-9b60-4f51-b8ab-78df26bc2cdd",
      "name": "Respond to Webhook",
      "type": "n8n-nodes-base.respondToWebhook",
      "position": [
        660,
        0
      ],
      "parameters": {
        "options": {},
        "respondWith": "binary"
      },
      "typeVersion": 1.1
    },
    {
      "id": "cb0df6bc-d733-4e07-9506-c413d390e482",
      "name": "Request img",
      "type": "n8n-nodes-base.webhook",
      "position": [
        0,
        0
      ],
      "parameters": {
        "path": "db4880e7-2134-4994-94e5-a4a3aa120440",
        "options": {},
        "responseMode": "responseNode"
      },
      "typeVersion": 2
    },
    {
      "id": "b7153f9a-f635-48c4-b8fe-d9e93deb33ed",
      "name": "Do anything to log",
      "type": "n8n-nodes-base.noOp",
      "position": [
        660,
        200
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "id": "d5e4143c-f321-4632-9adf-e95ca718210f",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -80,
        360
      ],
      "parameters": {
        "width": 980,
        "height": 1280,
        "content": "## \ud83d\udcec Workflow: Transparent Tracking Pixel for Email Open Detection\n\n### \ud83d\udccc Description\nThis workflow serves a **1x1 transparent PNG image** via a webhook, which can be embedded in an email to **track when the email is opened**. When the image is loaded by the recipient's email client, the webhook is triggered, optionally capturing a `userId` to identify who opened the email.\n\n---\n\n### \ud83d\udcc2 Workflow Steps\n\n1. **Webhook Trigger** (`Request img`)\n   - **Path:** `/webhook/change-with-your-id`\n   - Triggered by an HTTP request (e.g. when the image is loaded in an email).\n   - Accepts a query parameter `id` to identify the recipient.\n\n2. **Set Base64 Data** (`Create data pix`)\n   - Creates a variable `data` containing a Base64-encoded transparent PNG image (1x1 pixel).\n\n3. **Convert to Binary** (`Create img bin`)\n   - Converts the Base64 `data` string into a binary file.\n   - Sets MIME type to `image/png`.\n\n4. **Respond to Webhook** (`Respond to Webhook`)\n   - Sends the binary image file in the HTTP response.\n\n5. **Logging** (`Do anything to log`)\n   - Placeholder node to log or process the `id` or request metadata.\n   - You can access the `id` using `{{$json[\"query\"][\"id\"]}}`.\n   - You can also use any parameter you want\n\n---\n\n### \u2709\ufe0f How to Use in Emails\n\nEmbed the image in an HTML email like this:\n\n```html\n<img src=\"https://<your-n8n-instance>/webhook/db4880e7-2134-4994-94e5-a4a3aa120440?id=1234\" width=\"1\" height=\"1\" style=\"display:none;\" alt=\"\" />\n```\n\nWhen the email is opened and the image is loaded, the workflow will be triggered.\n\n---\n\n### \ud83d\udee0\ufe0f Notes\n- Some email clients block images by default; this may prevent tracking.\n- You can enhance the workflow to store open events in a database, log the timestamp, IP, or user agent.\n- Make sure to comply with data privacy and consent regulations (e.g. GDPR)."
      },
      "typeVersion": 1
    }
  ],
  "connections": {
    "Request img": {
      "main": [
        [
          {
            "node": "Create data pix",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Create img bin": {
      "main": [
        [
          {
            "node": "Respond to Webhook",
            "type": "main",
            "index": 0
          },
          {
            "node": "Do anything to log",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Create data pix": {
      "main": [
        [
          {
            "node": "Create img bin",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  }
}

About this workflow

Webhook Respondtowebhook. Uses convertToFile, respondToWebhook, noOp, stickyNote. Webhook trigger; 6 nodes.

Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →

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