Free Hex Encoder
Hexadecimal is the lingua franca of low-level data — hashes, keys, byte dumps, and protocol fields all speak hex. The Hex Encoder converts any text to its hex representation with full Unicode support, plus formatting options developers actually need: uppercase output, byte separators, and 0x prefixes for code-ready literals.
How to Use the Hex Encoder
- Type or paste your text.
- The hex output updates live.
- Adjust separator, case, and 0x prefix as needed.
- Click Copy to use the hex string.
Features
Live hex encoding; UTF-8 based; uppercase toggle; separator options; 0x prefix; byte count; copy button.
Benefits & Use Cases
Prepare test vectors for crypto code, format keys for config files, inspect exact byte content of strings, or generate hex literals for C, Python and JavaScript.
Tips
Hex doubles the size of your data (2 chars per byte) — it's a representation, not compression. For non-UTF-8 byte sequences, work from the raw bytes instead of text.
Frequently Asked Questions
What is hexadecimal encoding?
It is writing each byte as two characters 0–9/A–F. It makes binary data readable and is the standard way to display hashes, keys, and memory dumps.
Why do some characters become 4+ hex digits?
Because they are multi-byte in UTF-8. ASCII letters are one byte (2 hex digits); emoji and many scripts use 2–4 bytes.
Uppercase or lowercase hex?
Both are equivalent — decoders accept either. Uppercase is traditional in some specs; lowercase dominates in web contexts like hashes.
What are 0x prefixes for?
They mark a value as hexadecimal in programming languages like C, JavaScript, and Python, so 0xFF is read as 255, not as text.
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