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Base64 Encode / Decode

Encode or decode UTF-8 text using standard Base64 representation.

Base64 Encode / Decode Inputs

Results computed instantly — your data never leaves your device.

Base64 Encode / Decode Results

Real-Time

Encoded

SGVsbG8gd29ybGQ=

Decoded

Invalid encoded input or empty text

100% Client-SidePrivate & Secure

How to Use the Base64 Encode / Decode

  1. 1

    Enter text or a Base64 string.

  2. 2

    Review the deterministic encoded and decoded fields.

  3. 3

    Use UTF-8 text for predictable results.

  4. 4

    Do not treat Base64 as encryption or secrecy.

Formula & Mathematical Basis

Base64 maps groups of bytes to a 64-character alphabet and uses padding when needed.

Variable Key

input

Text passed to the encoder or decoder

alphabet

Base64 symbols A–Z, a–z, 0–9, +, and /

📝 Base64 is an encoding for representation and transport; it does not provide confidentiality.

Step-by-Step Examples

1

Encode Hello

Scenario: Enter Hello.

  1. 1.Convert the UTF-8 bytes to six-bit groups.
  2. 2.Map groups to the Base64 alphabet.
  3. 3.Add padding if needed.
  4. 4.Review SGVsbG8=.
✅ Hello encodes as SGVsbG8=.

Practical Use Cases

  • Inspect API or data transport representations.
  • Decode a known Base64 payload for debugging.

Common Pitfalls

  • Calling encoding encryption.
  • Sharing sensitive data in an online tool.
  • Mixing URL-safe and standard Base64 alphabets.

Frequently Asked Questions

Is Base64 secure?

No; anyone with the encoded text can decode it.

Does the tool send text to a server?

No; this calculator runs client-side.

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