Base Number Converter

Convert numbers between any bases (2–36) with binary, octal, decimal, and hex output

GET 1 credit /v1/base-convert

curl "https://devtools.toolkitapi.io/v1/base-convert?value=255&from_base=10&to_base=16"

import httpx

resp = httpx.get(
    "https://devtools.toolkitapi.io/v1/base-convert?value=255&from_base=10&to_base=16",
)
print(resp.json())

const resp = await fetch("https://devtools.toolkitapi.io/v1/base-convert?value=255&from_base=10&to_base=16", {
});
const data = await resp.json();
console.log(data);

# See curl example

Response 200 OK

{
  "input": "255",
  "from_base": 10,
  "to_base": 16,
  "decimal": 255,
  "result": "FF",
  "all_bases": {
    "binary": "11111111",
    "octal": "377",
    "decimal": "255",
    "hexadecimal": "FF"
  }
}

Try It Live

Description

Convert numbers between any bases (2–36) with binary, octal, decimal, and hex output

How to Use

1

1. Pass the number as `value`, its current base as `from_base`, and the target base as `to_base`.

2

2. The `result` field contains the converted value in the target base.

3

3. The `all_bases` object always provides the value in binary (2), octal (8), decimal (10), and hexadecimal (16) regardless of the target base.

About This Tool

Base Number Converter converts a number from any base (2–36) to any other base, and always includes the value in binary, octal, decimal, and hexadecimal for quick reference.

Pass a value in its source base and the target base, and get back the converted result plus all four standard representations.

Why Use This Tool

Low-level debugging — Convert between hex, binary, and decimal while inspecting memory or registers
Bitwise analysis — See binary representations for flag/mask values
Encoding work — Convert between base-2, base-16, and base-36 encodings
Education — Visualise how a number looks across different bases

Frequently Asked Questions

What bases are supported?

Any base from 2 to 36. Digits beyond 9 use uppercase letters A–Z (e.g. base 16 uses 0–9 and A–F).

Does it support negative numbers?

Yes. Negative results are prefixed with `-` in all output representations.

What if the value isn't valid for the source base?

An error is returned, e.g. `"'G' is not a valid base-16 number"`.

Start using Base Number Converter now

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