---
title: "base64EncodedString(options:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/nsdata/base64encodedstring(options:)"
---

# base64EncodedString(options:)

Creates a Base64 encoded string from the string using the given options.

## Declaration

```swift
func base64EncodedString(options: NSData.Base64EncodingOptions = []) -> String
```

## Parameters

- `options`: A mask that specifies options for Base-64 encoding the data. Possible values are given in doc://com.apple.foundation/documentation/Foundation/NSData/Base64EncodingOptions.

## Return Value

Return Value A Base64 encoded string.

## Discussion

Discussion By default, no line endings are inserted. If you specify one of the line length options (lineLength64Characters or lineLength76Characters) but don’t specify the kind of line ending to insert, the default line ending is Carriage Return + Line Feed.

## See Also

### Encoding and Decoding Base64 Representations

- [init(base64EncodedData:options:)](foundation/nsdata/init(base64encodeddata:options:).md)
- [init(base64Encoding:)](foundation/nsdata/init(base64encoding:).md)
- [init(base64EncodedString:options:)](foundation/nsdata/init(base64encodedstring:options:).md)
- [base64EncodedData(options:)](foundation/nsdata/base64encodeddata(options:).md)
- [base64Encoding()](foundation/nsdata/base64encoding().md)
- [NSData.Base64EncodingOptions](foundation/nsdata/base64encodingoptions.md)
- [NSData.Base64DecodingOptions](foundation/nsdata/base64decodingoptions.md)