Base64 Encoder and Decoder
This tool converts text to the Base64 representation used in many transport and test contexts, and it reverses Base64 text back into Unicode text when the input is valid.
Encode text to Base64 or decode a Base64 string
Choose encode or decode. The browser performs the conversion locally.
Processing mode: browser-only for this tool. The interface does not require a server upload to perform its transformation.
Start with a focused browser tool
This tool converts text to the Base64 representation used in many transport and test contexts, and it reverses Base64 text back into Unicode text when the input is valid.
Designed for: Developers and technical teams exchanging small text values in documentation, APIs, or test fixtures.
How to use this tool
Enter text and choose Encode to create a Base64 string. Choose Decode to interpret a valid Base64 string as UTF-8 text. The result panel reports invalid input instead of silently returning partial data.
How the result is produced
The interface uses the browser atob and btoa primitives with UTF-8 conversion around them. Base64 is an encoding, not encryption, so anyone who receives the encoded text can decode it.
Test examples
Encode “Hello” to SGVsbG8=. Decode SGVsbG8= back to “Hello”. A string containing characters outside the Latin-1 range is converted through UTF-8 so common Unicode text can be handled.
Limitations
Base64 does not provide confidentiality, authentication, or password protection. This text tool is not a binary-file encoder and should not be used as a security boundary. Invalid padding or characters will produce a decode error.
Privacy and processing
Encoding and decoding occur in the browser. The input is not sent to the Nofyi server by this tool.
Related guide
Base64 is encoding, not encryption: practical uses and limits
Related tools in this category
Documentation
- https://www.rfc-editor.org/rfc/rfc4648
- https://developer.mozilla.org/en-US/docs/Web/API/Window/btoa
- https://developer.mozilla.org/en-US/docs/Web/API/Window/atob
This page describes the implementation shipped with the NOFYI Tool Factory. Review the interface output before using it in a production workflow.