> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pictify.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Tracking Pixel

> Returns a 1x1 transparent GIF and records an impression event.
Use this for email open tracking or invisible impression tracking.

```html
<img src="https://api.pictify.io/s/homepage-hero/pixel.gif" width="1" height="1" />
```

Always returns a valid pixel, even for invalid slugs (to prevent broken images).




## OpenAPI

````yaml get /s/{slug}/pixel.gif
openapi: 3.1.0
info:
  title: Pictify API
  version: 1.0.0
  description: |
    Generate images, GIFs, and PDFs from HTML templates programmatically.

    ## Authentication
    All API requests require a Bearer token in the Authorization header:
    ```
    Authorization: Bearer pk_live_your_api_key
    ```

    ## Rate Limits
    - Free: 60 requests/minute
    - Pro: 300 requests/minute
    - Business: 1,000 requests/minute

    Rate limit headers are included in all responses.
  contact:
    email: support@pictify.io
    url: https://pictify.io
  license:
    name: MIT
servers:
  - url: https://api.pictify.io
    description: Production
security:
  - bearerAuth: []
tags:
  - name: Images
    description: Image generation endpoints
  - name: GIFs
    description: GIF generation and capture
  - name: PDFs
    description: PDF generation
  - name: Templates
    description: Template management
  - name: Batch
    description: Batch rendering operations
  - name: Experiments
    description: A/B testing, smart links, and scheduled variant experiments
  - name: Webhooks
    description: Webhook subscription management
  - name: Bindings
    description: Data binding for auto-rendering
paths:
  /s/{slug}/pixel.gif:
    get:
      tags:
        - Experiments
      summary: Tracking pixel
      description: >
        Returns a 1x1 transparent GIF and records an impression event.

        Use this for email open tracking or invisible impression tracking.


        ```html

        <img src="https://api.pictify.io/s/homepage-hero/pixel.gif" width="1"
        height="1" />

        ```


        Always returns a valid pixel, even for invalid slugs (to prevent broken
        images).
      operationId: trackExperimentPixel
      parameters:
        - name: slug
          in: path
          required: true
          schema:
            type: string
          description: Experiment slug
      responses:
        '200':
          description: 1x1 transparent GIF
          headers:
            Cache-Control:
              schema:
                type: string
                example: no-cache, no-store, must-revalidate
          content:
            image/gif:
              schema:
                type: string
                format: binary
      security: []
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key obtained from the Pictify dashboard

````