How to Use This Tool
Enter a Number
Type a number into the input field in any of the four supported bases.
Select the Input Base
Choose whether your number is Hexadecimal, Decimal, Binary, or Octal from the dropdown.
See All Conversions
The tool instantly shows the number in all four bases. For hex values that represent a color or an ASCII character, a preview is shown too.
Copy Any Result
Click the copy button next to any result to put it on your clipboard.
Frequently Asked Questions
Is this tool really free?
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Yes, completely free with no limits and no sign-up. Everything runs in your browser.
Is my data sent to a server?
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No. All conversion happens directly in your browser. Nothing you type is ever sent anywhere.
What is hexadecimal?
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Hexadecimal (hex) is the base-16 number system using digits 0-9 and letters A-F. It is widely used in web colors, memory addresses, and encoding because each hex digit represents exactly 4 binary bits.
What number systems are supported?
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Four: Hexadecimal (base 16), Decimal (base 10), Binary (base 2), and Octal (base 8).
What is the ASCII preview?
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When the hex value represents a printable ASCII character (decimal 32 to 126), the tool shows that character. For example, hex 41 shows the letter A.
What is the color preview?
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When the hex value is 3 or 6 digits long and looks like a color code, a small color swatch is shown so you can see what that color looks like.
Can I enter values in any base?
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Yes. Switch the input base dropdown to Decimal, Binary, Octal, or Hexadecimal and the tool converts to all four bases.
Does it handle large numbers?
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Yes. The tool handles numbers of any size your browser can process.
Does it update instantly?
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Yes. Results appear as soon as you type. No button to click.
Is hex case-sensitive?
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No. You can type ff or FF or fF. The tool treats them all the same.
What Is Hexadecimal Converter?
Hexadecimal Converter is a free tool that converts numbers between hexadecimal, decimal, binary, and octal right in your browser. It also shows an ASCII character preview and a color swatch when the hex value represents one. Nothing you type is ever sent anywhere - all math runs locally on your device.
Enter a number in any of the four bases and see all conversions at once with copy buttons. The ASCII and color previews make it especially useful for web developers and anyone working with encoded data.
Features Explained
Four Number Bases
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Convert between Hexadecimal (base 16), Decimal (base 10), Binary (base 2), and Octal (base 8) simultaneously.
ASCII Character Preview
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When the hex value maps to a printable ASCII character, the tool shows it. Hex 41 = A, hex 20 = space, hex 7A = z.
Color Swatch Preview
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When the hex value is 3 or 6 digits and looks like a color code, a small color swatch appears so you can see the color at a glance.
All Results at Once
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Enter a number in any base and see it in all four formats instantly. No need to convert one pair at a time.
Any Input Base
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Select your input base from the dropdown. The tool accepts hex (0-9, A-F), decimal (0-9), binary (0-1), or octal (0-7).
Copy Buttons
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Each result has its own copy button so you can grab the hex, decimal, binary, or octal value in one click.
Instant Conversion
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Results update live as you type. No Convert button needed.
Case Insensitive
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Hex letters can be entered in uppercase or lowercase. The tool handles both.
Input Validation
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If you enter digits outside the valid range for the selected base, the tool shows an error message.
100% Browser-Based
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All conversion runs directly in your browser. Nothing you type is ever sent to any server.
Who Is This Tool For?
Web Developers
Convert hex color codes to decimal RGB values, or check what color a hex value represents with the live swatch.
Programmers
Convert between hex, binary, and decimal when debugging memory addresses, bitwise operations, and data encoding.
Computer Science Students
Practice hex conversions and understand how hex relates to binary, decimal, and octal.
Teachers
Demonstrate hex conversions in real time during computer science and math lessons.
Designers
Convert hex color codes and verify what they look like using the built-in color preview.
Network Engineers
Convert MAC addresses, IP values, and protocol fields between hex and decimal.
Security Analysts
Decode hex values from packet captures, log files, and encoded payloads.
Embedded Developers
Convert register values and memory addresses between hex, binary, and decimal.
Game Developers
Convert color codes, memory offsets, and sprite data between hex and other bases.
Data Engineers
Convert hex-encoded data fields to decimal or binary for analysis.
Database Administrators
Convert hex field values when inspecting raw data or debugging queries.
QA Engineers
Convert hex error codes to decimal for research and bug reporting.
IT Support
Look up hex error codes and convert them to decimal for troubleshooting.
Electronics Hobbyists
Convert between hex and binary when reading chip datasheets and configuring hardware.
Firmware Developers
Convert flash addresses and configuration registers between hex and binary.
Protocol Analysts
Convert protocol field values between hex and decimal when reading specifications.
Reverse Engineers
Decode hex dumps and convert encoded payloads between bases.
Arduino Users
Convert pin configurations and register values between hex, binary, and decimal.
CTF Players
Decode hex-encoded flags and convert between bases for challenges.
Cryptographers
Convert key values and cipher outputs between hex and other formats.
ASCII Art Creators
Look up hex values for specific ASCII characters using the character preview.
Email Developers
Decode hex-encoded characters in email headers and MIME content.
Accessibility Auditors
Convert hex color codes to decimal for contrast ratio calculations.
Anyone
Quickly convert any number between hex, decimal, binary, and octal for any reason.
Tips for Best Results
Hex to binary shortcut
Each hex digit maps to exactly 4 binary bits. F = 1111, A = 1010, 5 = 0101, 0 = 0000. Convert one digit at a time.
Common hex values
FF = 255, 0A = 10, 10 = 16, 100 = 256. Hex is just a compact way to represent binary.
Hex colors
Web colors use 6-digit hex: FF0000 = red, 00FF00 = green, 0000FF = blue, FFFFFF = white, 000000 = black.
ASCII in hex
Hex 41 = A, hex 61 = a, hex 30 = 0. The ASCII preview shows the character for printable values.
Two hex digits = one byte
Each pair of hex digits represents one byte (0 to 255). FF is one byte at maximum value.
Case does not matter
You can type ff, FF, or fF. The tool normalizes the input automatically.
Copy any result
Click the copy button next to any base to grab that value without selecting it manually.
Results update instantly
Change the input and all four bases recalculate immediately.
Color swatch for quick reference
When your hex value is 3 or 6 digits, the color preview shows you what that hex color looks like.
Privacy is built in
Nothing you type is ever sent to any server. All conversion runs in your browser.
Privacy & Security
This tool runs 100% in your browser. Your files stay entirely on your own device. Nothing is uploaded, nothing is shared, and no server, advertiser, or third party has access to your files.
If a tool saves your work on your own device, you can remove it at any time using the Clear All button. Some tools rely on an external service to return their result; in those cases, only the minimum data required for the request is sent, and never your files or content. Any ads shown on this page run in an isolated frame and cannot read, touch, or transmit anything you upload, paste, type, or download here. Advertisers may see standard visit information like your IP address and which page you're on, as described in our Privacy Policy, but your data itself stays fully under your control.
