Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal. Fast, offline, zero permissions.

Number Base Converter — Instant Binary, Octal, Decimal, and Hex Conversion Number Base Converter is a minimal, dark-themed Chrome extension that converts any number between binary, octal, decimal, and hexadecimal in a single click. Enter a value, choose the source base, click Convert, and all four representations appear simultaneously — no switching tabs, no pasting into online calculators, no waiting for a page to load. Designed for developers, students, and anyone who works with number systems daily and needs a fast, always-available number base converter that works entirely offline without any permissions. HOW IT WORKS Type your number into the input field, select the base you are converting from — Binary (base 2), Octal (base 8), Decimal (base 10), or Hexadecimal (base 16) — and click Convert or press Enter. The number base converter immediately displays all four output values on individual color-coded result cards. Copy a single value with the card's dedicated Copy button, or click Copy All to grab all four representations as a formatted labeled block suitable for pasting into notes, bug reports, documentation, or chat messages. The whole flow takes about two seconds. WHO IS IT FOR This number base converter is built for embedded systems and firmware engineers who switch between hex memory addresses and binary bit patterns dozens of times per day. Computer science students studying number systems, bitwise arithmetic, or assembly language who need a quick reference without opening a full calculator application. Web developers working with HTML color codes, CSS hex values, numeric bitmask flags, or character encoding tables. Network engineers reading subnet masks, port numbers, or protocol identifiers expressed in different numeric bases. Anyone taking a digital electronics, computer architecture, or introductory CS course who wants an instant offline number base converter always available one click away. KEY FEATURES All four bases at once — the number base converter shows binary, octal, decimal, and hexadecimal results simultaneously on a single screen, so you never have to re-run a conversion to see a different output base. Per-card copy buttons — copy any individual result with a dedicated button on each result card, with no manual text selection or keyboard gymnastics required. Copy All — exports all four labeled values (Binary: …, Octal: …, Decimal: …, Hexadecimal: …) as a clean formatted block, ready to paste into documentation or a team message. Enter key shortcut — pressing Enter in the input field triggers conversion instantly without moving to the mouse. Clear error messages — entering an invalid digit for the selected base makes the number base converter show a descriptive error message rather than producing a silent wrong result or an empty output. Dark theme — the deep navy background (#0f172a) and purple accent palette are easy on the eyes during late-night debugging sessions and look natural alongside developer tools. Zero permissions — the number base converter requests no access to your open tabs, browsing history, clipboard, cookies, or any website you visit. Fully offline — the number base converter runs locally using pure JavaScript integer arithmetic. Nothing is transmitted to any server, ever. SUPPORTED CONVERSIONS The number base converter converts in both directions between all four bases in one step. Binary to octal, decimal, and hexadecimal. Octal to binary, decimal, and hexadecimal. Decimal to binary, octal, and hexadecimal. Hexadecimal to binary, octal, and decimal. Input is case-insensitive for hex — both ff and FF are accepted. Non-negative integers up to JavaScript's safe integer limit (2^53 - 1) are supported accurately. PRIVACY FIRST Number Base Converter requests zero browser permissions. It cannot inject scripts into web pages, read your browsing history, or communicate with any external server. Every conversion runs entirely inside the number base converter popup. No analytics, no advertisements, no telemetry of any kind. GETTING STARTED Pin the number base converter icon to your Chrome toolbar for one-click access. Click it, type a number into the input field, select the source base from the dropdown, and press Convert or Enter. No configuration, no accounts, no subscriptions. Install the number base converter now and switch between binary, octal, decimal, and hexadecimal without opening another calculator.