Hex Converter – Convert Hex Online (Free Tool)
Free online Hex Converter tool to convert text to hexadecimal and hexadecimal to text. Translate between human-readable text and hex representation using 0-9 and A-F characters. Perfect for encoding data and debugging. All conversion happens locally in your browser.
Example Output
ASCII "Hi " (3 bytes) plus the party emoji (4 bytes in UTF-8).
48 69 20 F0 9F 8E 89
What is Hex Converter?
Hex Converter switches between text and the hexadecimal byte sequence that encodes it. Handles full UTF-8 so emoji and CJK characters work correctly — each character expands to the right number of bytes. Useful for debugging file headers, protocol analysis, and "what bytes does this actually contain?" investigations.
Why use this tool?
- No registration, account, or installation required
- No API keys to manage and no rate limits to monitor
- 100% free with no hidden costs or daily limits
- Works with very large inputs (multi-megabyte JSON, long regex patterns, big tables)
- No telemetry on the tokens, payloads, or code you paste in
How to use
- Pick direction: Text → Hex or Hex → Text
- Type text (UTF-8) or paste hex bytes (with or without spaces)
- Click Convert — output appears formatted with spacing between bytes
- Useful for inspecting non-printable characters and Unicode byte sequences
Examples
Inspect byte count of non-ASCII
"é" → C3 A9 (2 bytes UTF-8). "日" → E6 97 A5 (3 bytes). Helps size-budget when working with UTF-8-limited fields.
Decode a hex dump
48 65 6C 6C 6F 20 57 6F 72 6C 64 → "Hello World". Strip any prefix like 0x or 0x00- from a debugger output first.
Common use cases
- Debugging text encoding issues (mojibake, double-encoded UTF-8)
- Reading file headers and protocol-level hex dumps
- Crafting test payloads with specific byte sequences
- Verifying that special characters round-trip through your pipeline
Troubleshooting
- Decoded text shows unexpected characters.
- Source might not be UTF-8. If the bytes come from an older system, the encoding could be Latin-1 or Windows-1252 — try a dedicated re-encoding tool first.
Frequently Asked Questions
Hexadecimal (hex) is a base-16 number system using digits 0-9 and letters A-F. It is commonly used to represent binary data in a more compact, human-readable format.
Try these related tools
Explore more Developer Tools
Discover other free, privacy-first tools in Developer Tools.