> For the complete documentation index, see [llms.txt](https://docs.pentaho.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pentaho.com/pdia-data-integration/9.3-data-integration/pdi-transformation-steps-reference-overview/s3-file-output-cp/options-s3-file-output/fields-tab.md).

# Fields tab

![Fields tab in S3 File Output](/files/ZY9Ed591Mu4xK9VRDVRU)

The **Fields** tab allows you to define the properties for the exported fields.

| Column                     | Description                                                                                                                                                                                                                                                                                                                                                                             |
| -------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Name**                   | Specify the name of the field.                                                                                                                                                                                                                                                                                                                                                          |
| **Type**                   | Select the field's data type from the dropdown list or enter it manually.                                                                                                                                                                                                                                                                                                               |
| **Format**                 | Select the format mask (number type) from the dropdown list or enter it manually. See [Common Formats](/pdia-data-integration/9.3-data-integration/pdi-transformation-steps-reference-overview/common-formats.md) for information on common valid date and numeric formats you can use in this step.                                                                                    |
| **Length**                 | <p>Specify the length of the field, according to the following field types:</p><ul><li><strong>Number</strong></li></ul><p>Total number of significant figures in a number</p><ul><li><strong>String</strong></li></ul><p>Total length of the string</p><ul><li><strong>Date</strong></li></ul><p>Length of printed output of the string (for example, four is a length for a year)</p> |
| **Precision**              | Specify the number of floating point digits for number-type fields.                                                                                                                                                                                                                                                                                                                     |
| **Currency**               | Specify the symbol used to represent currencies (for example, `$` or `€`).                                                                                                                                                                                                                                                                                                              |
| **Decimal**                | Specify the symbol used to represent a decimal point, either a dot `.` or a comma `,` (for example, `5,000.00` or `5.000,00`).                                                                                                                                                                                                                                                          |
| **Group**                  | Specify the method used to separate units of thousands in numbers of four digits or larger, either a dot `.` or a comma `,` (for example, `5,000` or `5.000`).                                                                                                                                                                                                                          |
| **Trim type**              | Select the trimming method to apply to a string, which truncates the field (**none**, **left**, **right**, **both**) before processing. Trimming only works when no field length is specified.                                                                                                                                                                                          |
| **Null**                   | Specify the string to insert into the output text file when the value of the field is null.                                                                                                                                                                                                                                                                                             |
| **Get Fields** (button)    | Click to retrieve a list of fields from the input stream.                                                                                                                                                                                                                                                                                                                               |
| **Minimal width** (button) | Click to minimize the field length by removing unnecessary characters. If selected, string fields will no longer be padded to their specified length.                                                                                                                                                                                                                                   |

See \[Understanding PDI data types and field metadata]\(../../../../Data%20Integration%20Perspective/Data%20Integration%20perspective%20in%20the%20PDI%20client/Advanced%20topics%20(PDI%20perspective)/Understanding%20PDI%20data%20types%20and%20field%20metadata.md) to maximize the efficiency of your transformation and job results.


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