Encode plaintext to space-separated hex
Input
Hello WorldExample output
48 65 6c 6c 6f 20 57 6f 72 6c 64Hex (Base16) Encoder & Decoder
Encoders & Decoders100% Client-SideReady
TEXT
0 lines0 chars
0 B / 4.77 MB
Read-only
0 lines0 chars
0 B
About this tool, examples & FAQ
Convert text to hexadecimal (Base16) or decode hex byte streams back to UTF-8 text. Configure uppercase/lowercase letters, byte delimiters (spaces, colons, hyphens), and 0x prefixes. 100% browser-based with zero network requests.
Key facts
| Letter Casing | Lowercase (a-f) and Uppercase (A-F) |
|---|---|
| Delimiters | None, space, colon, or hyphen separation |
| Maximum Input | 5 MB |
| Execution Deadline | 2 s |
How to use
- Paste your text or hexadecimal code into the input editor.
- Select Encode or Decode operation from the toolbar.
- Configure formatting: choose casing (lowercase/uppercase), delimiter, and 0x prefix.
- Click Run (or press Ctrl/Cmd + Enter) to process the data locally in Web Worker memory.
- Copy or download the converted output.
Examples
Decode hex to plaintext
Input
48 65 6c 6c 6f 20 57 6f 72 6c 64Example output
Hello WorldEdge cases
Odd-length hexadecimal strings
Every byte in hexadecimal consists of exactly two characters. If an odd number of hex digits is supplied when decoding, the tool flags an error explaining that a digit is incomplete.
Delimiters and prefixes
The decoder automatically strips spaces, newlines, commas, colons, hyphens, and common notation prefixes ('0x', '\x', '$') before parsing.
UTF-8 multi-byte characters
Non-ASCII characters like emojis and accented characters are properly represented by multiple 2-digit hex bytes matching their UTF-8 encoding.
How it works
- Converts input string characters to UTF-8 byte arrays using TextEncoder.
- Transforms each byte into a 2-character hexadecimal string padded with leading zeros.
- Applies optional casing, prefix, and delimiter formatting.
- Decodes hex pairs back to raw bytes and decodes with UTF-8 TextDecoder.
Related workflows
Binary ↔ Text Converter
Convert text to 8-bit binary strings (Base2) and decode binary byte representations back to UTF-8 text.
Base64 Encoder / Decoder
Encode UTF-8 text to standard or URL-safe Base64 and decode Base64 back to text.
Hash Generator
Generate cryptographic hashes and message digests including SHA-256, SHA-512, SHA-384, SHA-1, and MD5 for text payloads.
Frequently asked questions
Why is hexadecimal used in computer science?
Because each hexadecimal digit represents exactly 4 bits (half a byte or nibble), two hex digits represent exactly one 8-bit byte. This makes hex ideal for inspecting memory, network packets, and binary formats.
What hex formats are accepted when decoding?
The decoder accepts contiguous strings (48656c6c6f), space-separated bytes (48 65 6c 6c 6f), colon-delimited (48:65:6c:6c:6f), or C-style arrays with '0x' prefixes.
Is my data processed locally?
Yes. All processing executes inside your browser in a dedicated Web Worker sandbox. No information is stored or transmitted.
References
- RFC 4648 Section 8 — Base 16 Encoding — Official IETF specification for Base16 (Hexadecimal) data encoding