Base64 Encode/Decode
The tool automatically identifies the input type: plain text will generate Base64 encoding, valid Base64 will automatically decode to the original text.
Local processing · No File Upload Required
Files are processed in this browser without automatic uploads. Loading processing components for the first time may require an internet connection.
Scope and limitations
Get encoding or decoding results instantly after input, ideal for high-frequency scenarios such as API debugging, script development, and content troubleshooting.
Only UTF-8 text is processed; images and other binary files are outside this interface’s input scope.
Conversion Example
Input
Hello
Conversion Result
SGVsbG8=
Encoding example. Auto mode decodes valid UTF-8 Base64 text; switch modes manually when needed.
Usage Steps
Auto Detect
No need to manually select 'Encode' or 'Decode'—simply paste text or Base64 strings directly.
Real-time conversion
The tool automatically identifies the input type: plain text will generate Base64 encoding, valid Base64 will automatically decode to the original text.
Copy with One Click
Each result box provides a 'Copy' button for quick access to encoded or decoded content.
Frequently Asked Questions
Why is some content automatically decoded instead of encoded?
Automatic mode decodes Base64 only when it contains valid UTF-8 text; choose encode or decode manually for ambiguous input.
What usually causes decoding failure?
A common cause is that the input is not a complete and valid Base64 string, or invalid characters have been mixed in. First, confirm whether the original content was truncated or had extra content appended.