Base62 Encoder / Decoder

Encoded 5 character(s) of UTF-8 text to 7 Base62 character(s).

How it works

• Read the input as UTF-8 bytes.
• Converted the byte sequence to a big integer by repeated long division against base 62.
• Mapped the digits to the 0-9A-Za-z alphabet and preserved leading zero bytes as leading '0' characters.

• Base62 is an encoding, not encryption; it provides no confidentiality.
• The alphabet is case-sensitive, so 'A' and 'a' are different digits.

Methodology

1. Encode by interpreting the UTF-8 bytes as a big integer and dividing by 62, mapping each remainder to the 0-9A-Za-z alphabet.
2. Preserve leading zero bytes as leading '0' characters so the round trip is exact.
3. Decode by reversing the digit mapping and rejecting any character outside the alphabet.

Usage

1. Choose encode or decode.
2. Paste text to encode, or a Base62 value to decode.
3. Read the result; use Copy result to reuse it.

Examples

These are examples, not current values: they use fixed inputs, while the interactive tool computes live results in your browser.

Encode ASCII

{
  "mode": "encode",
  "value": "hello"
}

Encode Unicode

{
  "mode": "encode",
  "value": "café 🌍"
}

Decode a Base62 value

{
  "mode": "decode",
  "value": "7tQLFHz"
}

Limitations

Where Base62 is used

Base62 is common for short identifiers and URL-friendly slugs because every character is alphanumeric and safe in a path. It is not standardised, so treat a value as portable only when the producing and consuming systems agree on the alphabet.