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Base64 to Octal

Paste a Base64 string and convert it to octal — each decoded byte shown as an octal number.

Last updated: May 29, 2026

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What is Base64 to Octal?

Base64 to Octal decodes a Base64-encoded string to its underlying bytes and then represents each byte as an octal value (e.g., 110 145 154 154 157 for "Hello"). Octal is a base-8 number system historically used in Unix file permissions and early computing. This tool is useful for educators, systems programmers, and anyone studying data representation.

How to Use Base64 to Octal

1

Paste your Base64 string into the input box.

2

Click "Convert to Octal".

3

Copy the octal output.

Common Use Cases

  • Studying octal byte representation as part of a computer science curriculum.
  • Converting Base64-encoded data to octal for legacy system compatibility.
  • Cross-checking octal values against binary and hex outputs for verification.

Example Input and Output

Decoding "Hello" (Base64: SGVsbG8=) to octal.

Base64
SGVsbG8=
Octal bytes
110 145 154 154 157

Privacy

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Frequently Asked Questions

What is octal notation?

Octal is base-8, using digits 0–7. Each byte (0–255) maps to an octal value from 0 to 377. It was common in early Unix systems and is still used for file permission modes like chmod 755.

How does this differ from Base64 to Binary?

Both decode the Base64 string to the same bytes. The difference is in how those bytes are displayed: binary uses 8-bit sequences of 0s and 1s; octal uses base-8 numbers, which are more compact.

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