Base64 Encoder/Decoder
Use base64 encoder/decoder locally, without uploading your data.
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What this tool does
Use base64 encoder/decoder locally, without uploading your data. UTF-8 text only; Base64 is encoding, not encryption.
How to use the Base64 Encoder/Decoder
- Enter or select text or base64.
- Enter or select operation.
- Read the calculated result; change any measurement to compare alternatives.
Formula
UTF-8 text → bytes → Base64; inverse uses strict UTF-8 decoding
- value
- Text or Base64
- direction
- Operation
UTF-8 text only; Base64 is encoding, not encryption.
Worked example
For base64 encoder/decoder, the following measurements illustrate the exact method: Text or Base64: Hello, MasterTool!; Operation: encode.
Inputs
- Text or Base64Hello, MasterTool!
- OperationEncode UTF-8 text
Result
- ResultSGVsbG8sIE1hc3RlclRvb2wh
Results explained
- Result
- Result from the formula above. UTF-8 text only; Base64 is encoding, not encryption.
Frequently asked questions
UTF-8 text → bytes → Base64; inverse uses strict UTF-8 decoding
UTF-8 text only; Base64 is encoding, not encryption.
No. Content stays in your browser and no API is called.
Copy the result, review it in your project, and test it in the intended environment.
No. Syntax checks and conversions cannot replace application-specific testing, security review or accessibility review.