terraform/website/docs/language/functions/textdecodebase64.mdx

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---
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page_title: textdecodebase64 - Functions - Configuration Language
description: >-
The textdecodebase64 function decodes a string that was previously
Base64-encoded,
and then interprets the result as characters in a specified character
encoding.
---
# `textdecodebase64` Function
-> **Note:** This function is supported only in Terraform v0.14 and later.
`textdecodebase64` function decodes a string that was previously Base64-encoded,
and then interprets the result as characters in a specified character encoding.
Terraform uses the "standard" Base64 alphabet as defined in
[RFC 4648 section 4](https://tools.ietf.org/html/rfc4648#section-4).
The `encoding_name` argument must contain one of the encoding names or aliases
recorded in
[the IANA character encoding registry](https://www.iana.org/assignments/character-sets/character-sets.xhtml).
Terraform supports only a subset of the registered encodings, and the encoding
support may vary between Terraform versions.
Terraform accepts the encoding name `UTF-8`, which will produce the same result
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as [`base64decode`](/language/functions/base64decode).
## Examples
```
> textdecodebase64("SABlAGwAbABvACAAVwBvAHIAbABkAA==", "UTF-16LE")
Hello World
```
## Related Functions
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* [`textencodebase64`](/language/functions/textencodebase64) performs the opposite operation,
applying target encoding and then Base64 to a string.
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* [`base64decode`](/language/functions/base64decode) is effectively a shorthand for
`textdecodebase64` where the character encoding is fixed as `UTF-8`.