Binary to hex converter
1010 in binary is A in hexadecimal: each group of four bits becomes one hex digit, so long runs of zeros and ones turn into short, readable values for masks, flags and colours. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Binary
- 1010
- Hex
- A
- Bits
- 4
- Base
- 16
A binary to hex converter rewrites a base-two bit string into base sixteen so every four bits become one compact hex digit from zero through F. You type a sequence such as one zero one zero and receive A, which is the same integer written with place values that are powers of sixteen instead of powers of two. Students use the tool to check homework on nibble grouping and place-value charts; developers use it when documenting bit masks, register dumps, protocol flags, or color-channel patterns that are easier to scan as hex than as long runs of zeros and ones. Only the digits zero and one are accepted: any letter, space inside the number, punctuation, or other symbol fails with a clear validation error instead of a silent wrong answer.
How binary to hexadecimal conversion works
Start with a finite string that uses only the characters zero and one. If the value is zero, both the cleaned binary and the hex result are the single digit zero and you are done. For a positive bit pattern, strip redundant leading zeros so the bit count reflects the significant bits, then pad on the left with zeros only as needed so the length becomes a multiple of four.
Each group of four bits is a nibble: reading left to right, those four places are worth eight, four, two, and one, and their sum is an integer from zero through fifteen. Map that integer to the hex alphabet zero through nine and A through F. Concatenating the hex digits produces the full base-sixteen string without a zero-x prefix.
Where binary to hex tools show up in real work
Secondary-school and introductory computer-science courses teach that four binary digits map to one hex digit; a trusted oracle that returns both the cleaned bit string and the hex value speeds answer keys and classroom demos without spreadsheet formulas. Firmware and embedded notes often list register fields in binary next to their hex addresses so reviewers can verify bit offsets at a glance. Network and graphics engineers reason about bit masks, permission flags, and color channels where writing FF is clearer than eight ones when scanning a dump.
Coding-interview warm-ups and online judges ask candidates to implement binary-to-hex conversion; tutors compare student output against a known-good uppercase string for zero, powers of two, and full-nibble edge cases such as fifteen and two hundred fifty-five. Treat decimal-to-binary conversion, multi-base radix tables, and fixed-width two’s-complement packing as separate search intents with their own landings rather than stretching this bit-string converter past its honest scope.
What you can do with it
Homework and nibble drills
Check textbook answers for grouping bits into fours and mapping each nibble to a hex digit from 0–F, including zero and full-byte patterns.
Register dumps and bit-mask docs
Turn binary flag or register strings into compact hex when writing protocol notes, permission tables, or hardware reference pages.
FAQ
What inputs does the binary to hex converter accept?
Optional leading/trailing whitespace and an optional 0b prefix are allowed; any other character is rejected.
How is the hex result formatted?
Uppercase digits 0–9 and A–F with no 0x prefix and no leading zeros except for the value zero itself (for example 1010 → A, 11111111 → FF).
What happens if I enter a non-binary character?
Digits other than 0 and 1, letters, punctuation, and spaces inside the bit string are not accepted.
What does it cost?
The browser tool is free and runs locally.
Related tools
For developers — API access
Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.
API endpoint
Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.
Call it from your stack
curl -X POST https://api.kit.forhosting.com/fmt/binary-hex \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"binary":"1010"}'const res = await fetch("https://api.kit.forhosting.com/fmt/binary-hex", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"binary": "1010"
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/fmt/binary-hex",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"binary": "1010"
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/fmt/binary-hex", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"binary":"1010"}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"binary":"1010"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/fmt/binary-hex", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"binary": "1010"
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "fmt.binary_hex",
"status": "queued",
"_links": {
"result": "/tasks/tsk_…/result"
}
}The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.
Pricing
Published price — no tokens, no invented credits. A failed task is never charged.
Limits
max_bits | 256 |
Errors
| HTTP | Code | Meaning |
|---|---|---|
401 | unauthorized | Missing or invalid API key. |
402 | insufficient_balance | Your balance doesn't cover the task price. |
404 | unknown_type | That task type doesn't exist. |
429 | rate_limited | Too many requests. Use the webhook instead of polling. |
Technical notes
Pricing for successful API calls is the published base of $0.002 per item.
How binary to hexadecimal conversion works
Whitespace at the ends may be trimmed, and an optional zero-b prefix familiar from programming languages may be removed, but every remaining character must still be a binary digit or the request fails. Equivalently, the same integer can be obtained by evaluating the binary place-value sum and rewriting it in base sixteen, but nibble grouping is exact integer arithmetic with no floating-point rounding, no random seeds, no wall-clock timestamps, and no network calls, so identical inputs always produce identical JSON. Strings longer than two hundred fifty-six bits are rejected so browser and Worker work stays bounded.
What you send and what you get back
Send a single required field binary holding a string of zeros and ones. Examples include binary one zero one zero mapping to hex A with four bits, binary one one one one one one one one mapping to hex FF with eight bits, and binary zero mapping to hex zero with one bit. If you need arbitrary source and target bases from two through thirty-six in one call, use a general radix converter landing rather than overloading this binary-only page. Aliases bits, value, n, input, and text are accepted so forms and scripts can use the name that fits their UI. binary may be a JSON string; bare numbers that happen to look like binary digits are coerced carefully, but the preferred and documented contract is a digit string. Missing binary, empty strings after trim, characters outside zero and one, and strings longer than two hundred fifty-six bits fail with invalid_input and are not charged. On success the response echoes the cleaned binary string under binary, the uppercase hexadecimal string under hex, the significant bit count under bits, and base set to sixteen for explicitness in multi-tool pipelines. Pricing for successful API calls is the published base of $0.002 per item; validation failures do not consume prepaid balance.
Where binary to hex tools show up in real work
Because this capability is a pure parse engine, API pricing is the published base of $0.002 per successful item and failed validation does not consume balance.
Integration use cases
Interview and unit-test fixtures
Generate expected hex strings for coding exercises and golden tests covering powers of two, all-ones nibbles, and edge-length bit strings.
Technical questions
Is there a length limit?
Yes. After trim, the binary string may contain at most 256 bits so conversion stays bounded in the browser and on the Worker.