Base64 Encoder / Decoder
Encode and decode Base64 strings locally with UTF-8 support. No input is sent to a server.
Output
Runs fully in your browser. Input is not sent to a server, logged, stored, or transmitted.
How to use this tool
Enter the required values in the labeled fields. Results update in your browser and are announced for assistive technologies. Use realistic measurements and verify important outcomes before acting on them.
Formula or logic
Browser UTF-8 encoding and decoding functions transform the text locally. Invalid Base64 input shows an error.
Example calculation
Example: Hello world encodes to SGVsbG8gd29ybGQ=.
Frequently asked questions
Is my input uploaded?
No. Base64 encoding and decoding runs fully in your browser.
Does it support Unicode?
Yes. UTF-8 text is supported.
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