Hex Encoder & Decoder

About this tool

Convert text to its hexadecimal byte representation, or decode hex back to text. Useful for debugging encodings, binary data and low-level protocols.

Example

Input: Hi

Output: 48 69

Privacy

This tool runs entirely in your browser. Your data is processed locally and never uploaded to a server.

How to use this tool

1. Type or paste the text you want to convert into the input box.
2. Choose whether you want to encode text to hex or decode hex back to text.
3. Check the result shown by the tool and copy it if you need it elsewhere.
4. If decoding, make sure the hex string is valid and formatted the way the tool expects.

Step by step, what happens

1. The tool reads your input as either plain text or hexadecimal, depending on the selected direction.
2. If encoding, it converts the text into its UTF-8 bytes and shows each byte as hex pairs.
3. If decoding, it reads the hex pairs, turns them back into bytes, then interprets those bytes as UTF-8 text.
4. Any invalid hex characters, odd-length input, or unsupported byte sequences are surfaced as decode issues so you can fix the input.

Worked example

Here is a simple example where you encode a short greeting and then decode it back.

Input: Hello

1. You enter Hello in the text input and choose the encode direction.
2. The tool converts each UTF-8 byte into hexadecimal and shows the result.
3. If you later paste that hex back into decode mode, it converts back to the original text.

Tips and common mistakes

• If decoding fails, check that you only used hex characters 0-9 and a-f or A-F.
• Some tools accept spaces between byte pairs, which makes longer hex strings easier to read.
• UTF-8 text with accents or symbols will produce multiple hex bytes for a single visible character.
• If the decoded text looks wrong, the source data may not actually be UTF-8.

Frequently asked questions