# How to Convert XLS and X12 to XML

Convert `.xls`, `.xlsx`, and X12 files (`.xml` or `.txt`) to envelopes.

This uses the built-in converter.

### Create a conversion rule

1. Create a new conversion rule.
2. In the first window, upload a sample file in the required format.
3. In the second window, write the conversion rule.
   * Use XPath to map values into the target fields.
4. Run the rule.
5. Check the output in the third window.
6. In the **Name** field, add a regexp for matching input files.
7. Save the conversion rule.

### Convert files automatically

Put files with matching names into the `inbox` or `outbox` folder.

They will be converted to envelopes automatically.


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