---
title: NSData.Base64DecodingOptions
framework: foundation
role: symbol
role_heading: Structure
path: foundation/nsdata/base64decodingoptions
---

# NSData.Base64DecodingOptions

Options to modify the decoding algorithm used to decode Base64 encoded data.

## Declaration

```swift
struct Base64DecodingOptions
```

## Topics

### Initializers

- [init(rawValue:)](foundation/nsdata/base64decodingoptions/init(rawvalue:).md)

### Constants

- [ignoreUnknownCharacters](foundation/nsdata/base64decodingoptions/ignoreunknowncharacters.md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Equatable](swift/equatable.md)
- [ExpressibleByArrayLiteral](swift/expressiblebyarrayliteral.md)
- [OptionSet](swift/optionset.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)
- [SetAlgebra](swift/setalgebra.md)

## 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)
- [base64EncodedString(options:)](foundation/nsdata/base64encodedstring(options:).md)
- [base64Encoding()](foundation/nsdata/base64encoding().md)
- [NSData.Base64EncodingOptions](foundation/nsdata/base64encodingoptions.md)