What Is Base Converter?
The Base Converter is a versatile online tool that lets you convert numbers between any two bases from 2 to 64. Whether you need to change a decimal value into binary, octal, or hexadecimal, or transform a hex string into a decimal number, this tool handles it instantly. It supports all common bases plus less‑familiar ones like base‑36 or base‑64, making it useful for programmers, students, and anyone working with different numeral systems.
Instead of juggling separate calculators for binary and hex, you get one unified converter. Just type a number, select the source and target bases, and the result appears immediately. It’s perfect for debugging, learning number systems, or encoding data for protocols that use non‑standard bases. The tool is free, works in any browser, and requires no downloads.
Key Features
- Supports bases 2 to 64 – Convert between binary, octal, decimal, hexadecimal, base‑36, base‑64, and any custom base in that range.
- Real‑time conversion – Results update as you type, so you don’t need to click a button.
- Two‑way conversion – Swap source and target base with one click to reverse the conversion.
- Handles large numbers – Works with numbers up to 64 bits, suitable for most programming tasks.
- Copy‑to‑clipboard – Easily grab the result for pasting into code or documentation.
- Clean, distraction‑free interface – No ads or clutter; focuses on the conversion task.
How to Convert Hexadecimal to Decimal
- Open the Base Converter on ToolFK by navigating to the tool page.
- In the “Source base” dropdown, select 16 (hexadecimal).
- Enter the hexadecimal number you want to convert (e.g.,
FFor1A3B). Letters can be uppercase or lowercase. - In the “Target base” dropdown, select 10 (decimal).
- The converted decimal value appears instantly in the output field.
- Click the copy icon to copy the result, or swap the bases to perform the reverse conversion.
Best Use Cases
- Debugging embedded systems – Quickly translate hex register values to decimal for analysis.
- Learning number systems – Students can verify manual binary/octal/hex conversions.
- Web development – Convert color hex codes (#FF5733) to RGB decimal values.
- Encoding data – Use base‑64 conversion for token generation or URL parameters.
- Networking – Translate binary IP addresses and subnet masks to dotted‑decimal notation.
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Frequently Asked Questions
What bases does the Base Converter support?
The converter supports any base from 2 to 64. Common bases like binary (base‑2), octal (base‑8), decimal (base‑10), and hexadecimal (base‑16) are built in, but you can also enter a custom base (e.g., 36 for alphanumeric, 64 for base‑64 encoding). All letters and digits used in each base follow standard conventions.
Can I convert hexadecimal to binary directly?
Yes. Simply set the source base to 16 (hex) and the target base to 2 (binary). The tool will output the binary representation of your hex number. For example, A in hex becomes 1010 in binary. This is especially useful when working with bitmasks or low‑level hardware addresses.
Does the tool support negative numbers or fractions?
The Base Converter handles whole non‑negative integers. It does not support negative signs, decimal points, or fractions. For typical programming use cases (e.g., converting memory addresses or color values), this is sufficient. If you need signed or floating‑point conversion, consider using a specialized calculator.
Is my data safe when using this tool?
Yes. The Base Converter runs entirely in your browser. No data is sent to any server—all conversion happens locally using JavaScript. You can use it even without an internet connection after the page loads. This means your numbers, whether they are passwords or proprietary values, never leave your device.
How accurate are the conversions for large numbers?
The tool uses JavaScript’s BigInt for arithmetic, which supports integers of arbitrary size. However, for display purposes, results are capped at a practical length (typically 64 bits). For numbers larger than 2^64, the conversion may truncate or produce an approximation. For most programming and educational scenarios, this limit is rarely reached.
Why would I need to convert base‑36 or base‑64?
Base‑36 and base‑64 are commonly used in web development to create short, alphanumeric strings from numeric IDs. For example, YouTube video IDs use base‑64 encoding. The Base Converter lets you decode or encode such strings quickly, which is handy when debugging APIs or generating unique tokens.
Last updated: July 1, 2026