Category: Security & Network
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Unicode Inspector: Codepoints, UTF-8 Bytes, and That Weird Character
Codepoint, name, block.
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Punycode Converter: Why ñ.com Shows Up as xn--nda.com
International domain names.
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VIN Decoder: Region, Year, and Check Digit From 17 Characters
Basic vehicle identification.
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Phone Formatter: Normalize Numbers So They Match
Normalize numbers.
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HMAC Generator: A Secret-Signed Message via Web Crypto
HMAC with secret and hash.
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ISBN Validator: ISBN-10 vs ISBN-13 Checksums, Decoded
Confirms ISBN-10 and ISBN-13 checksums.
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IBAN Validator: Is That Bank Number Even Real
Check IBAN syntax and checksums per country.
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Luhn Mock Cards: Test Checkout With Numbers That Pass the Check
Valid test cards for sandbox checkouts.
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JWT Decoder: See What an Auth Token Is Really Claiming
Split tokens into header, payload, and signature.
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UUID Checker: Version, Variant, and Well-Formedness in One Look
Confirm an identifier fits standard UUID syntax.