HEX HeroConvert Hex to String
Decode hexadecimal values to text strings instantly with our free online tool. Enter hex bytes and get immediate string output—no signup needed. Perfect for debugging, API analysis, and software development.
How to Decode Hex to String
Input Hex from Logs
Paste hex bytes from network captures or debug output
Extract Identifiers
See variable names, JSON keys, and tokens emerge from hex
Match Against Known Strings
Compare decoded strings with expected API values
Debug String Boundaries
Identify null terminators (00) and string length issues
Hex to String Conversion Examples
| Hexadecimal Input | String Output | Description |
|---|---|---|
| 22 65 72 72 6F 72 22 3A 22 75 6E 61 75 74 68 6F 72 69 7A 65 64 22 | "error":"unauthorized" | JSON error property |
| 62 65 61 72 65 72 54 6F 6B 65 6E | bearerToken | Authentication variable name |
| 73 72 63 2F 69 6E 64 65 78 2E 6A 73 | src/index.js | Source file path |
| 5F 5F 70 72 6F 74 6F 5F 5F | __proto__ | JavaScript prototype property |
| 43 6F 6E 74 65 6E 74 2D 54 79 70 65 | Content-Type | HTTP header field name |
| 6E 75 6C 6C | null | Null literal value |
What is Hex to String Conversion?
Hex to string decoding helps developers extract meaningful identifiers from hex-encoded application data—variable names, JSON object keys, configuration values, and authentication tokens. When debugging API responses, database query results, or compiled code, hex strings often encode critical metadata: "6E 75 6C 6C" reveals a null literal, "5F 5F 70 72 6F 74 6F 5F 5F" exposes the __proto__ property, and long hex sequences may contain JWT tokens or session identifiers. This is particularly valuable when reverse engineering protocols or analyzing serialized objects where string identifiers determine data structure.
Development workflows use hex-to-string decoding for log analysis (extracting error codes and method names), security testing (revealing obfuscated API endpoints), and data migration (converting hex-stored configuration from legacy systems). Unlike general text conversion that handles prose and punctuation, string conversion focuses on programmatic identifiers—camelCase variables, snake_case constants, HTTP header names, and JSON property keys that drive application logic. Network debugging tools display packet payloads in hex; converting these reveals REST endpoints like "api/v2/users" or header fields like "Content-Type". Encode strings to hex using our String to Hex converter.
Common String Patterns: Decoding Reference
Programming Strings
Common Delimiters
Common Use Cases for Hex to String Decoding
Security & Token Analysis
- • JWT payload string extraction
- • Session token hex decoding
- • OAuth callback parameter debug
- • API key format validation
Cache & Storage Debugging
- • Redis key name decoding
- • LocalStorage hex values
- • Memcached string inspection
- • Session store key recovery
HTTP & Network Protocol
- • Header field name extraction
- • Cookie attribute decoding
- • Query string parameter names
- • WebSocket frame string data
Why Choose This Hex String Tool
Developer-Focused Output
String format for programming
API Debug Assistant
Decode hex-encoded responses
Config File Parser
Extract strings from hex data
Token Decoder
Reverse authentication strings
Variable Recovery
Extract code identifiers
Payload Inspector
Analyze hex-encoded data structures
Understanding String Decoding from Hexadecimal
Redis DUMP commands and cache debugging often expose keys as hex: 75 73 65 72 3A 31 32 33 decodes to user:123, revealing cache key structure. JWT tokens use base64-encoded JSON where the payload portion, when decoded to hex then to string, exposes claims like {"sub":"user123"}. Network protocol analysis shows HTTP headers and JSON payloads as hex bytes—spotting 43 6F 6E 74 65 6E 74 2D 54 79 70 65 (Content-Type) helps parse protocol boundaries.
String boundary detection requires identifying terminators: null bytes (00) end C strings, newlines (0A) separate text lines, and quotes (22) delimit JSON strings. When parsing hex dumps, consecutive printable bytes (20-7E) form string candidates, while control characters mark separators. URL-encoded strings show percent signs (25) followed by hex digit pairs. The ASCII to Hex table maps these common delimiters.
Security analysis uses hex to detect suspicious strings: 5F 5F 70 72 6F 74 6F 5F 5F reveals __proto__ in payloads (prototype pollution indicator), 3C 73 63 72 69 70 74 3E shows <script> tags (XSS attempts). Session token formats become visible—random bytes indicate encryption while readable hex suggests encoding only. For reverse conversion, use String to Hex. For UTF-8, try Hex to UTF-8.
Common Hex String Issues
What hex formats are supported?
Our converter accepts hex with or without 0x prefix, with spaces or no spaces. Examples: "48656C6C6F", "48 65 6C 6C 6F", "0x48 0x65 0x6C 0x6C 0x6F" all work.
Can I decode JSON strings?
Yes! Our converter decodes any hex-encoded text including JSON strings, API responses, configuration values, and serialized data.
What about special characters?
Our converter handles all string characters including symbols, punctuation, delimiters, and whitespace. For international characters, use our Hex to UTF-8 converter.
How do I encode strings to hex?
Use our String to Hex converter to encode text strings into hexadecimal values. It performs the exact reverse operation of this tool.
How do I decode Redis keys from hex?
Redis DUMP commands output hex. Paste the hex bytes to see the original key names—useful for debugging cache issues or recovering keys from Redis backups and RDB files.
Can I extract JWT payload strings?
Yes! JWT payloads contain hex-encoded property names. Decode hex sections to reveal claim names like "sub", "iat", "exp", or custom fields for security analysis and token debugging.
Convert a string of characters to hexadecimal numbers.
Convert hexadecimal numbers to text characters.
Convert hexadecimal numbers to ASCII characters.
Convert hexadecimal numbers to UTF8 characters.
A tool for generating random hexadecimal numbers.
ASCII to hex conversion table.