Hex String Validator and Formatter
Validate, clean, and reformat hexadecimal strings. Remove invalid characters, add prefixes, and format for readability. Streamline your workflow when handling raw hex data from logs or dumps.
Hex String Validator & Formatter
Validate and format hexadecimal strings
How it works
Paste any hex string into the input field. The validator checks that all characters are valid hexadecimal digits (0-9, A-F, a-f) and optionally verifies the string meets length requirements.
The formatter cleans up the input by removing invalid characters, normalizing case (uppercase or lowercase), and adding or removing prefixes like "0x" or "#" based on your preference.
Additional options include grouping digits for readability (every 2, 4, or 8 characters), padding to specific lengths, and validating against common formats like MAC addresses, UUIDs, or color codes.
When You'd Actually Use This
Data Cleaning
Clean and standardize hex data from multiple sources before processing or importing into systems.
MAC Address Formatting
Validate and format MAC addresses to consistent notation (colon, hyphen, or dot separated).
Hash Verification
Verify that cryptographic hashes (MD5, SHA-1, SHA-256) are valid hex strings of correct length.
Code Cleanup
Standardize hex literals in codebases to consistent formatting style across the project.
Input Validation
Validate user input in forms that require hex values like color pickers or configuration fields.
Log Analysis
Extract and validate hex values from log files for analysis and correlation.
What to Know Before Using
Valid hex characters: Only 0-9 and A-F (or a-f) are valid. Letters G-Z and special characters (except prefixes) are invalid.
Common hex formats: MAC addresses are 12 hex digits, MD5 is 32, SHA-1 is 40, SHA-256 is 64, UUIDs are 32 with hyphens.
Prefix conventions: 0x for programming, # for colors, no prefix for hashes and addresses. Choose based on your use case.
Case sensitivity: Hex values are case-insensitive. Uppercase is traditional for documentation, lowercase common in code.
Whitespace handling: Spaces, hyphens, and colons are typically separators, not part of the value. The formatter can add or remove them.
Common Questions
What makes a valid hex string?
Only characters 0-9 and A-F (case insensitive) are valid. Optional prefixes like 0x or # may be included depending on format.
How do I format a MAC address?
MAC addresses are 12 hex digits. Common formats: AA:BB:CC:DD:EE:FF (colon), AA-BB-CC-DD-EE-FF (hyphen), or AABB.CCDD.EEFF (Cisco dot).
What's the length of an MD5 hash?
MD5 hashes are always 32 hex digits (128 bits). SHA-1 is 40 digits (160 bits), SHA-256 is 64 digits (256 bits).
Can I validate a UUID?
Yes. UUIDs are 32 hex digits displayed as 8-4-4-4-12 with hyphens. The validator checks both format and hex validity.
How do I add 0x prefix to multiple values?
Paste your hex values, select "Add 0x prefix" option, and the formatter will prepend 0x to each value automatically.
What if my string has invalid characters?
The validator highlights invalid characters. You can choose to remove them automatically or fix them manually before formatting.
Can I convert lowercase to uppercase?
Yes. Select the case normalization option to convert all hex letters to uppercase or lowercase consistently.
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