Hex to Decimal Converter
Convert hexadecimal (base 16) values to decimal (base 10) instantly in your browser.
Input base
Convert hexadecimal (base 16) values to decimal (base 10) instantly in your browser. This page is dedicated to the hex to decimal converter — paste your value and get the result instantly, right in your browser.
Converting Between Number Bases
Computers speak in binary — strings of 0s and 1s — but humans invented several shorthand notations to make those long bit strings easier to read and write. Binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) are the four numeral systems you encounter most often in computing, networking, and electronics. This converter lets you move freely between all four, showing every representation the moment you type.
How to Use This Tool
Select the base your number is in using the BIN / OCT / DEC / HEX buttons, then
type or paste the value into the input field. All four conversions appear
simultaneously below — no button to press. Each result box shows the standard
prefix (0b for binary, 0o for octal, 0x
for hex) alongside the digits, and each has its own Copy button so you can grab
exactly the format you need.
Hit Try an example to populate a sample number and see all four formats at once. To start over with a different base, simply click a different base button — the input clears automatically to prevent confusion from reinterpreting the old digits in a new base.
Common Use Cases
- Debugging memory addresses: Paste a hex address from a crash report and check the decimal offset against your data structure size.
- Understanding color codes: Convert
0xffto decimal (255) to confirm it is the maximum value for an 8-bit color channel. - Unix permissions: Verify that octal 755 equals binary 111 101 101 — confirming rwxr-xr-x at a glance.
- Bitwise operations: Express a bitmask in binary first to understand which bits are set, then convert to hex for the code.
- Embedded systems: Convert register values between the hex your datasheet gives you and the binary that makes sense of individual flag bits.
- Cryptography: Cross-check hash segments or key bytes between hex and decimal representations.
Why BigInt Matters for Accuracy
JavaScript's standard numbers use IEEE 754 double-precision floating point,
which can represent integers exactly only up to 253 − 1
(about 9 quadrillion). Beyond that, digits are silently rounded. This tool
bypasses that limitation by using the native BigInt type, which
handles arbitrarily large integers exactly. That matters when converting 64-bit
memory addresses, SHA-256 hash fragments, or any value your platform represents
as a 32-bit or 64-bit word.
Privacy
Every conversion runs locally in your browser. No numbers, addresses, or hash values are sent to any server. You can safely use this tool with confidential data such as cryptographic keys, internal IP addresses, or proprietary register values.
Frequently Asked Questions
What is binary and why does it matter in computing?↓
Binary (base 2) uses only the digits 0 and 1, which map directly to a transistor's off and on states. Every piece of data your computer stores or processes — text, images, instructions — is ultimately represented as a sequence of binary bits. Understanding binary helps developers work with bitwise operations, network masks, and low-level protocols.
When would a developer need hexadecimal (base 16)?↓
Hex is compact: one hex digit represents exactly four bits, so a full byte fits in two characters (e.g. 0xFF). This makes it the preferred notation for color codes (#3b82f6), memory addresses, cryptographic hashes, and network MAC addresses. Debuggers and disassemblers display data in hex because it is far more readable than long binary strings.
What is octal (base 8) used for today?↓
Octal is still common in Unix/Linux file-permission notation. The command chmod 755 sets permissions using three octal digits — each digit encodes three bits (read, write, execute) for owner, group, and others. You may also encounter octal in some embedded-systems contexts and legacy C codebases.
Does the converter handle large numbers accurately?↓
Yes. The converter uses JavaScript's BigInt internally, so it handles numbers beyond the 53-bit safe integer limit of regular floating-point arithmetic. This means values like 2^64 convert correctly without silent precision loss.
Is my data sent to a server?↓
No. All conversion happens entirely in your browser using JavaScript. No number you enter is transmitted anywhere.