What is hexadecimal encoding?

Hexadecimal (base 16) is a positional numeral system that uses sixteen distinct symbols: 0–9 to represent values 0 through 9, and A–F (or a–f) to represent values 10 through 15. Each byte of data (8 bits) is cleanly represented by exactly two hexadecimal digits.

What is the hex value for the letter "A"?

In standard ASCII encoding, uppercase "A" corresponds to decimal 65, which is represented in hexadecimal as 41 (or 0x41). Lowercase "a" is decimal 97, or hex 61.

Can this tool decode hex strings containing prefixes like "0x" or "\x"?

Yes. When in "Hex to Text" mode, the tool automatically strips out common formatting prefixes (0x, \x, %), whitespace, and colons before reconstructing the ASCII characters.

Does this converter support multiline text and special symbols?

Yes. Newlines, tabs, punctuation, and ASCII control characters are all faithfully converted into their exact hexadecimal byte counterparts.

Is my input text private?

Yes. All conversion logic executes locally inside your web browser using JavaScript. No text is ever transmitted over the network.

ASCII to Hex Converter

Convert plain text strings to hexadecimal byte values and decode hex back to ASCII characters online.

100% free
Private in browser
No signup
No watermarks

Byte Delimiter:

Byte Prefix:

Source ASCII / UTF-8 Text

Hexadecimal Output (15 bytes, 16 characters)

48 65 6c 6c 6f 2c 20 57 6f 72 6c 64 21 20 d83d

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About ASCII to Hex Converter

The ASCII to Hex Converter translates human-readable text into hexadecimal base-16 numerical values and decodes raw hex sequences back into ASCII strings. Designed for software engineers, security researchers, and systems developers who need to inspect byte encodings, format binary payloads, or format shellcode with custom delimiters and programming prefixes (such as 0x or \x).

How to use ASCII to Hex Converter

Paste plain text into the input box to encode into hex, or switch modes to decode hex back into text.
Select your desired byte delimiter (space, colon, comma, or continuous unspaced string).
Choose a hex prefix format (none, 0x for C/Java, \x for regex/Python strings, or % for URL encoding).
Toggle between lowercase and uppercase hex representations.
Copy the converted hexadecimal output with a single click.

Key features

Bidirectional conversion: Text to Hexadecimal and Hexadecimal to Text
Configurable byte delimiters (space, colon, comma, none)
Common programming prefixes (0x, \x, %)
Real-time byte and character counters with UTF-8 support

Frequently asked questions

What is hexadecimal encoding?: Hexadecimal (base 16) is a positional numeral system that uses sixteen distinct symbols: 0–9 to represent values 0 through 9, and A–F (or a–f) to represent values 10 through 15. Each byte of data (8 bits) is cleanly represented by exactly two hexadecimal digits.
What is the hex value for the letter "A"?: In standard ASCII encoding, uppercase "A" corresponds to decimal 65, which is represented in hexadecimal as 41 (or 0x41). Lowercase "a" is decimal 97, or hex 61.
Can this tool decode hex strings containing prefixes like "0x" or "\x"?: Yes. When in "Hex to Text" mode, the tool automatically strips out common formatting prefixes (0x, \x, %), whitespace, and colons before reconstructing the ASCII characters.
Does this converter support multiline text and special symbols?: Yes. Newlines, tabs, punctuation, and ASCII control characters are all faithfully converted into their exact hexadecimal byte counterparts.
Is my input text private?: Yes. All conversion logic executes locally inside your web browser using JavaScript. No text is ever transmitted over the network.