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Base64 to Hex Converter

Decode a Base64 string into its raw bytes as hexadecimal - missing padding is tolerated, whitespace is ignored.

5 bytes decoded

As UTF-8 text: Hello

Hex to Base64 Converter

How to Convert Base64 to Hex

Base64 packs three bytes into four characters, so decoding back to hex is just regrouping:

  1. Split the Base64 into groups of four characters
  2. Map each character back to its 6-bit value (A=0 through Z=25, a=26 through z=51, 0=52 through 9=61, +=62, /=63)
  3. Concatenate each group's 24 bits and split them into three bytes
  4. Write every byte as two hex digits

Example: Decode SGVsbG8=:

  • S(18) G(6) V(21) s(44) → 010010 000110 010101 101100 → 48 65 6C
  • b(27) G(6) 8(60) = → 011011 000110 111100 → 6C 6F
  • Result: 48 65 6C 6C 6F - the bytes of "Hello"

Code Examples

const b64 = "SGVsbG8=";
const bytes = Uint8Array.from(atob(b64), (c) => c.charCodeAt(0));
[...bytes].map((b) => b.toString(16).padStart(2, "0")).join(" ");
// "48 65 6c 6c 6f"

Frequently Asked Questions

How do I convert Base64 to hex?

Every four Base64 characters encode three bytes; decode those back to bytes, then write each byte as two hex digits. SGVsbG8= decodes to the bytes for Hello, which are 48 65 6C 6C 6F in hex.

What if my Base64 has no = padding?

Padding is optional here - the decoder works it out from the length. SGVsbG8 and SGVsbG8= give identical results. Padding that appears anywhere except the end is rejected as malformed.

Can it decode URL-safe Base64 (- and _)?

Not directly. URL-safe Base64 swaps +/ for -_ and is common in JWTs. Replace - with + and _ with / first; the tool points this out if it sees those characters.

Why decode Base64 to hex at all?

Hex shows the exact underlying bytes, which makes structure visible: magic numbers, embedded lengths, NUL terminators, and non-UTF-8 values that would render as gibberish characters in text output.

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