All Bases Encoder / Decoder

What it does

Converts numbers between any two bases from 2 to 36 — not just the common ones like binary, octal, decimal, and hexadecimal, but any custom radix in between (base 3, base 7, base 20, base 36...). It also includes a Text mode that converts each character of a string to/from its numeric code point in the chosen base, which is handy for building simple encodings or understanding how text maps to numbers.

Try it

How it works

Number ↔ Number mode

1. The input is parsed as an integer in the "From base" you selected, using JavaScript's arbitrary-precision BigInt so even very large numbers (larger than Number.MAX_SAFE_INTEGER) convert correctly.
2. That value is then re-encoded as a string of digits in the "To base", using the digits 0-9 then a-z for bases up to 36 (so base 16 uses 0-9a-f, base 36 uses every letter and digit).
3. Leading/trailing whitespace and underscores (sometimes used as digit separators, e.g. 1010_1100) are stripped before parsing.

Text ↔ Numbers mode

• Text → Numbers: each character's Unicode code point is converted to the target base and the results are shown space-separated (e.g. "Hi" → 72 105 in decimal, or 48 69 in hexadecimal).
• Numbers → Text: a space-separated list of numbers in the "From base" is parsed and each value is converted back to its character via String.fromCharCode.

Supported bases

Any integer base from 2 (binary) to 36 is supported, including the common presets:

Notes

• This is a pure numeric radix converter, not the Base64 encoding scheme (which encodes raw bytes, not integers, using a different alphabet including + and /). For that, see the dedicated Base64 Encoder / Decoder tool.
• Negative numbers are supported in Number mode (prefix with -).
• Everything runs entirely in your browser — nothing is sent anywhere.