Hex to Decimal Converter — Online Free Tool

Convert hexadecimal values (with or without 0x prefix) to decimal integers. Handles colour hex codes, memory addresses, and raw byte sequences.

Key Features

Converts hexadecimal strings to base-10 decimal numbers
Handles inputs with or without prefixes like "0x" or "#"
Supports both uppercase (A-F) and lowercase (a-f) hex characters
Arbitrary precision handling without 32-bit integer overflow

How to Use

Type or paste your hexadecimal string (e.g. 1A3F or 0x255) into the input box.
Verify that the characters are valid hex digits (0-9, A-F).
Click "Convert to Decimal" to compute the result.
Review the converted base-10 number in the output area.
Copy the decimal value for use in your calculations.

Example

Sample input

FF

Sample output

Edge Cases

0x prefix optional
Odd-length hex strings
Non-hex letters g-z

Frequently Asked Questions

Can I paste hex numbers prefixed with "0x" or "#"?

Yes. The converter automatically detects and strips prefixes like "0x", "0X", or "#" before performing the calculation.

Can this convert hex color codes into RGB decimal components?

Yes. You can paste 2-digit hex values for each color channel to get their decimal equivalent between 0 and 255.

What if my hexadecimal string contains spaces?

Spaced byte representations (e.g. "FF A0 12") can be converted sequentially or concatenated as a single hex value.

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Privacy notice: when you run this tool, your input is sent over HTTPS to our server, processed in memory and returned. It is not stored or logged. Avoid pasting live secrets such as private keys or passwords.