# PDF Standards, Document Sizes and Orientation

emSigner supports industry-standard PDF formats to ensure compatibility, long-term readability, and legal acceptance. Documents may be signed across multiple page sizes (e.g., A4, Letter, Legal) and orientations (portrait or landscape). Signature appearance and placement automatically adapt to document dimensions while preserving document integrity.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://support.emsigner.com/key-concepts/pdf-standards-document-sizes-and-orientation.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.