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Overview
The node provides a versatile set of utilities under the "PDF" resource, including an operation to convert PDF files into images. The PDF to Image operation allows users to transform PDF documents into image formats, which can be useful for previewing PDFs in environments that do not support PDF rendering or for extracting visual content from PDFs.
Common scenarios where this node is beneficial include:
- Generating thumbnails or previews of PDF pages for display in web or mobile apps.
- Extracting images from PDF reports or invoices for further processing.
- Converting PDF pages into images for use in presentations or social media.
Practical example:
- A user uploads a PDF invoice and wants to generate an image preview of the first page to embed in an email notification.
Properties
| Name | Meaning |
|---|---|
| Code Variables | Allows defining multiple code variables by selecting variable names/IDs from a list (loaded dynamically) and assigning string values to them. Useful when running code-related operations within the node. |
| Filename | The filename of the PDF file being processed. This helps identify or name the output image(s). |
| URL or Binary Data | Choose whether the input PDF is provided as a public URL or as binary data (buffer). |
| URL | If "URL" is selected above, specify the public URL of the PDF file here. |
| Binary Data | If "Binary Data" is selected above, provide the buffer containing the PDF file's binary content here. |
| Pages | Specify particular pages inside the PDF file to process. This can limit conversion to certain pages rather than the entire document. |
Output
The node outputs JSON data representing the result of the PDF to Image conversion. Typically, this includes information about the generated image(s), such as URLs or binary data references depending on configuration.
If the node supports outputting binary data, it will represent the converted images either as downloadable URLs or as binary buffers attached to the output items, enabling downstream nodes to handle or store the images accordingly.
Dependencies
- Requires an API key credential for authentication with the external service providing the PDF processing capabilities.
- The node relies on an external API endpoint corresponding to the "pdf/pdf-to-image" path to perform the conversion.
- Network access to the specified PDF URL (if using URL input) must be available.
- No additional environment variables are explicitly required beyond the API key credential.
Troubleshooting
- Invalid PDF Input: Errors may occur if the provided PDF URL is inaccessible, the binary data is corrupted, or the file is not a valid PDF. Verify the source and format of the PDF input.
- Page Specification Issues: Specifying invalid or out-of-range pages in the "Pages" property may cause errors or empty results. Ensure page numbers correspond to actual pages in the PDF.
- Authentication Failures: Missing or incorrect API key credentials will prevent the node from communicating with the external service. Confirm the API key is correctly configured.
- Network Errors: If the node cannot reach the PDF URL or the external API, check network connectivity and firewall settings.
- Output Handling: When expecting binary image data, ensure downstream nodes are configured to handle binary attachments properly.
Links and References
- n8n Expressions Documentation — For using expressions in properties like variable IDs.
- External API documentation (not included in source) would typically provide details on supported image formats, page selection syntax, and other options related to PDF to Image conversion.