> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/web/low-level-pdf-api/apis.md).

# APIs for low-level PDF document editing using JavaScript

Discover utility classes for PDF documents with this low-level API. Explore Web (Javascript) PDFNet.Obj and PDFNet.SDFDoc functionalities. The Apryse Web SDK streamlines secure, serverless document pr

{% hint style="info" %}
[Full API](/web/what-is-webviewer/full-api.md) is mainly used for PDF processing situations that are not featured using the Standard API. The preferred recommendation is to use the Standard API to address your situation when possible. Standard API is easy to use, loaded by default, and performs best for most situations.
{% endhint %}

The following are utility classes that can be used a low-level API for PDF documents.

**Web (Javascript)**

* [PDFNet.Obj](https://sdk.apryse.com/api/web/Core.PDFNet.Obj.html)
* [PDFNet.SDFDoc](https://sdk.apryse.com/api/web/Core.PDFNet.SDFDoc.html)


---

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