Base36 to Base64 Converter

Summary

Paste a base-36 string and get the standard RFC 4648 base-64 encoding instantly.

How it works

1. Enter or paste a base-36 string in the input field.
2. The tool decodes the string digit-by-digit into a big integer using BigInt arithmetic.
3. The integer's byte array is extracted in big-endian order.
4. Those bytes are base-64 encoded per RFC 4648 (standard alphabet, with = padding).
5. The result appears instantly; click "Copy" to copy it to your clipboard.

Use cases

• Convert short-link tokens or ID slugs stored as base-36 into base-64 for storage or transmission.
• Debug encoding pipelines that mix base-36 and base-64 representations.
• Verify that a base-36 value and a base-64 value encode the same underlying integer.
• Explore number-base conversions for educational or cryptographic purposes.
• Convert MongoDB or UUID compact IDs between encoding formats.

Frequently Asked Questions