Free tool
DeveloperBase64 Encoder/Decoder
Encode UTF-8 text to Base64 or decode Base64 back to text. Runs locally for REST API headers, data URLs, and classroom demos.
Runs in your browser — your data stays on your device
Free toolBase64 turns binary-safe text into an alphabet that survives email, JSON, and HTTP headers. This free Base64 encoder/decoder helps programming students and JavaScript developers move between plain text and Base64 without installing software. Use it when you debug Authorization headers, embed small assets, or explain why Base64 is encoding—not encryption—in web development and REST API labs.
How to use the Base64 Encoder/Decoder
- 1
Choose Encode to turn text into Base64, or Decode to reverse a Base64 string.
- 2
Paste your input and read the result instantly as you type.
- 3
Copy the output for API tests, JWT demos, or coursework examples.
Why Base64 still shows up in every stack
Beginners often treat Base64 as a security control. It is not. It only rewrites bytes so they travel safely through systems that expect printable text. API developers meet it in Basic auth, binary fields, and wire formats. Practising encode and decode here builds the muscle memory you need before you touch production tokens.
Base64 encoding example
Encode Hello, Binary Tech! and you should see SGVsbG8sIEJpbmFyeSBUZWNoIQ==. Decode that string and you return to the original sentence—proof the transform is reversible and not a secret vault.
Guides and next steps
Privacy note
Encoding and decoding run entirely in your browser. We do not upload your text.
Frequently asked questions
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