Why use BigInt instead of regular Number?

JavaScript's Number type is an IEEE-754 double, which can only represent integers exactly up to 2^53 − 1 (about 9.007 quadrillion). Beyond that, conversions silently lose precision: for example, 0xFFFFFFFFFFFFFFFF (a 64-bit unsigned max) rounds to a wrong decimal if you parse it with parseInt. This tool stores every value as a BigInt, so a 256-bit cryptographic hash or a 64-bit register dump converts byte-for-byte exact regardless of size.

How are negative numbers represented in binary (two's complement)?

When you enable a fixed bit width (8/16/32/64), the binary view shows the two's-complement representation. The rule is simple: to encode -n, take the unsigned binary of n, flip every bit, then add 1. So -1 in 8-bit becomes 11111111, and -128 becomes 10000000. The decimal field shows the signed integer, while the binary/hex fields show the raw fixed-width bit pattern. Without a fixed width, negatives are shown with a leading minus sign instead.

What's the difference between unsigned and signed?

For the same bit pattern, unsigned interprets the top bit as a regular value bit while signed interprets it as a sign bit. In 8-bit, 11111111 is 255 unsigned but -1 signed. This tool defaults to unsigned arithmetic for clarity but applies signed semantics whenever you type a negative decimal or use the NOT operator with a fixed bit width.

Why does my hex value sometimes have an "n" suffix when I copy it?

Pure BigInt literals in JavaScript end with the letter n (e.g. 255n). When you copy from this tool we strip that suffix and return the conventional 0x prefix (0xff) so the value pastes cleanly into any language — C, Python, Rust, Go, or another JS file. If you ever see a stray "n", it came from somewhere else.

Can I convert fractional or floating-point numbers?

No, this tool is for integers only. Fractional binary or hex (like 0.1 in binary) is a separate problem governed by IEEE-754 encoding rules. For decoding the bit layout of a 32- or 64-bit float, use our dedicated floating-point converter — it shows you the sign, exponent, and mantissa fields side-by-side with the decimal value.

Number Base Converter

Number base converter — binary, octal, decimal, hex, and any base 2-36. Bitwise too.

Runs locally
Category Calculator
Best for Getting a realistic range before a purchase, plan, workout, or schedule decision.

Bases

Bit width:

Binary (0/1)

Decimal (-/0-9)

Hex (0-9 a-f)

Octal (0-7)

Presets:

Custom base

From baseInputTo base

Result:

3530

Bitwise operations

A (0x / 0b / dec)OperatorB (0x / 0b / dec)

dec8

hex0x8

bin0b1000

All math runs on BigInt — exact up to thousands of digits. Values stay in your browser.

What this tool does

A precise, BigInt-powered number base converter that handles binary, octal, decimal, hexadecimal, and any custom radix from 2 to 36. The four primary fields are live-linked: edit one and the other three update instantly with validation, so you always see the same value in every base. Built-in bitwise calculator covers AND, OR, XOR, NOT, left shift, and right shift across 8/16/32/64-bit widths, with proper two's-complement padding for the binary view. Because every value is stored as a BigInt, conversions are exact up to thousands of digits — no silent precision loss above 2^53 like naive Number-based converters. One-click copy on every base, quick presets for common constants (255, 1024, 65535, 2^31), and full client-side execution mean your data never leaves the browser.

Tool details

Input: Numbers; The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output: Live result + Copy; The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy: Browser-side processing; The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share: No account required; Open the page and use it; whether results survive refresh depends on the tool.
Performance budget: Initial JS <= 14 KB; No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit: Calculator · Student; Category and role tags drive related tools, internal links, and quick fit checks.

How to use

1. Input

Paste or drop your content into the tool panel.
2. Process

Click the button. All processing is local in your browser.
3. Copy / Download

Copy the result or download to disk in one click.

How Number Base Converter fits into your work

Use it for fast estimates, comparisons, and planning numbers before you make the final call.

Calculation jobs

Getting a realistic range before a purchase, plan, workout, or schedule decision.
Comparing scenarios by changing one input at a time.
Turning rough assumptions into a number you can discuss.

Calculation checks

Double-check units, dates, rates, and rounding assumptions.
Treat health, finance, tax, and legal outputs as planning aids, not professional advice.
Save the inputs that produced an important result so you can reproduce it later.

Good next steps

These links move the current task into a more complete workflow.

FAQ

Tool combos

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Number Base Converter

Custom base

Bitwise operations

What this tool does

Tool details

How to use

1. Input

2. Process

3. Copy / Download

How Number Base Converter fits into your work

Calculation jobs

Calculation checks

Good next steps

FAQ

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