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

# Processing Documents

> Process documents with the ABBYY Vantage API: typical scenarios, skill selection, transactions, file uploads, processing options, and result retrieval.

Your application may call ABBYY Vantage services directly via the Vantage API. The API lets you process your files using any of the available skills and review documents in the Manual Review client. To design or edit skills and monitor activities, you will have to use the web interface. For more information, see the API description in the API Reference guide.

This guide walks you through a few simple steps where you will choose a skill to use, upload the files to be processed with that skill, and retrieve the results.

## Processing Methods

### Using Separate API Calls

[Using separate API calls](/vantage/developer/processing-documents/processing-documents-single-api) for creating a transaction, uploading a file, and starting a transaction. Choose this method if you want to process large files in multiple threads.

**Best for:**

* Large files
* Multiple file processing
* Multi-threaded uploads
* More control over the process

### Using a Single API Call

[Using a single API call](/vantage/developer/processing-documents/processing-documents-single-api) that does all of the above in one step. Choose this method if you only have one file that is less than 30 MB in size.

**Best for:**

* Small files (\< 30 MB)
* Single file processing
* Quick integration
* Simplified workflow