UTF-8 aware
The encoder handles regular Unicode text by converting strings through UTF-8 bytes before Base64 output.
Browser-based developer tools
Base64 Encoder
Encode and decode UTF-8 text as Base64 without sending input to a backend.
Reference notes
Base64 for payloads and tokens
API friendly
Base64 appears in tokens, request payloads, basic auth headers and compact transport formats.
Not encryption
Base64 is reversible encoding. Do not treat encoded values as secret or protected data.
Frequently asked
Base64 encoding questions
Is Base64 the same as encryption?
No. Base64 is a reversible text encoding, not encryption. Anyone can decode a Base64 string back to its original value with no key or password required. Do not use it to protect sensitive data.
Why does my decoded output look garbled?
This usually happens when the input contains characters outside the standard Base64 alphabet, or when the string was encoded with a different charset than UTF-8. Check for missing padding characters at the end of the string as well.
Where is Base64 commonly used?
Base64 shows up in JWT tokens, HTTP Basic authentication headers, embedding small images directly in CSS or HTML with data URIs, and encoding binary attachments inside JSON or XML payloads.
Does this tool handle large files?
This tool is built for text and short strings processed entirely in your browser. Very large files may slow down the tab since no data is streamed to a server for processing.