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Base64 Decoder

This tool lets you decode Base64-encoded text back into its original, human-readable form.

🛠️ Just paste your Base64 string below, click the button, and see the decoded result instantly.

Base64 Decoder​

Base64 Decoder

How it works​

const decoded = decodeURIComponent(escape(atob("5L2g5aW9")));
console.log(decoded); // => "你好"

This tool uses JavaScript functions to safely decode a Base64 string into readable text — even if the text includes non-English (Unicode) characters.

Step-by-step:

  1. atob(base64) Decodes the Base64 string into a binary (Latin1-encoded) string.

  2. escape(...) Converts the binary string into percent-encoded form (like %E4%BD%A0), which simulates a UTF-8 byte sequence.

  3. decodeURIComponent(...) Decodes that UTF-8 sequence back into the original Unicode string (e.g. 你好, emoji, etc.).