Base64 to Base36 Converter

Summary

Paste a Base64 string to get its Base36 (alphanumeric) equivalent, or convert Base36 back to Base64.

How it works

1. Paste a Base64 string into the input field and select the Base64 to Base36 direction.
2. The tool decodes the Base64 input to raw bytes using the standard alphabet (A-Z, a-z, 0-9, +, /).
3. The decoded byte sequence is interpreted as a big-endian unsigned integer.
4. That integer is re-encoded in Base36 using the digits 0-9 followed by letters a-z.
5. For the reverse direction, enter a Base36 string and the tool converts it back to Base64.
6. Copy the result with one click.

Use cases

• Generate compact, URL-safe identifiers from Base64 tokens.
• Store binary identifiers in case-insensitive systems.
• Convert UUIDs or session tokens to alphanumeric-only strings.
• Explore number-base relationships between Base64 and Base36.
• Produce human-readable short codes from encoded data.
• Verify round-trip fidelity between Base64 and Base36 representations.

Frequently Asked Questions