What is the maximum number base supported?

The converter supports bases from base-2 (binary) up to base-36, utilizing digits 0–9 and letters A–Z.

How many bits can this tool convert without rounding?

By using native BigInt registers, the tool can convert numbers hundreds of bits long without precision degradation.

Is any data sent to external servers?

No. All base conversions and string formatting execute purely in local browser memory.

Free & Private Online Browser Utility

Binary, Hex, Decimal & Octal Converter Free

Convert numbers across any radix base from base-2 to base-36 directly in your browser. Convert between binary, octal, decimal, hexadecimal, and custom bases with real-time bidirectional calculations. The engine uses JavaScript BigInt arithmetic to handle large multi-byte registers without floating-point truncation, making it suitable for systems programming, low-level debugging, and embedded development.

How to use

Step 1: Select Input Base

Choose Binary (base 2), Octal (base 8), Decimal (base 10), Hexadecimal (base 16), or custom radix.
Step 2: Enter Number String

Type your number; illegal digits for the selected base are rejected in real time.
Step 3: Copy Converted Formats

Read converted values across all standard bases and copy the required representation.

Options explained

Standard Programmer Bases

Dedicated synchronized fields for Binary (0b), Octal (0o), Decimal, and Hexadecimal (0x).

When to use: Use for bitmask analysis, memory address inspection, and register debugging.

BigInt Precision Engine

Evaluates numeric string representations using arbitrary-precision integers.

When to use: Use when converting 64-bit and 128-bit memory addresses that exceed standard float limits.

Byte Grouping Formatter

Formats binary strings in 4-bit nibbles or 8-bit octets and hex in byte pairs.

When to use: Improves readability when inspecting byte offsets and network packet headers.

Worked example

Input: Decimal: 255

Output: Binary: 11111111 | Hex: FF | Octal: 377

Computed using BigInt.toString(radix) with input validation against active base.

Tips & limits

Each hexadecimal digit corresponds to exactly 4 binary bits (one nibble): 0xF = 1111.
Hexadecimal prefixes conventionally use '0x', while binary uses '0b' and octal uses '0o' in code.
Arbitrary-precision BigInt arithmetic avoids precision loss when working with large 64-bit integer masks.

Common problems

Character rejected in binary mode: Binary accepts digits 0 and 1 only; switch to Hexadecimal if your input contains digits 2-9 or letters A-F.
Hexadecimal output shows lowercase letters: Use the Uppercase toggle to format hex digits in uppercase (e.g., 0xFF rather than 0xff).

Frequently Asked Questions (FAQ)

What is the maximum number base supported?: The converter supports bases from base-2 (binary) up to base-36, utilizing digits 0–9 and letters A–Z.
How many bits can this tool convert without rounding?: By using native BigInt registers, the tool can convert numbers hundreds of bits long without precision degradation.
Is any data sent to external servers?: No. All base conversions and string formatting execute purely in local browser memory.

How to use

Step 1: Select Input Base

Step 2: Enter Number String

Step 3: Copy Converted Formats