Security tools
Hash text, generate strong passwords and random tokens, inspect tokens and security policies, and work out network subnets. These tools run on your device, so secrets are not sent anywhere.
- Security
SHA-256 hasher
Calculate the SHA-256 digest of UTF-8 text locally. A plain hash is not encryption and does not make a password safe to store.
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SHA-512 hasher
Calculate the SHA-512 digest of UTF-8 text locally with Web Crypto. Text is not sent to a server.
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JWT inspector
Read the untrusted header and claims in a three-part JWT. This tool does not verify its signature, issuer, audience or permission to access anything. Do not paste a live secret token.
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Content Security Policy inspector
Read one CSP policy as directives and source tokens. This local parser does not run the policy, check a website or guarantee protection. Multiple policies need separate inspection.
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Password generator
Generate 1 to 50 random passwords, 8 to 128 characters long, from the character sets you choose, with at least one of each set and an entropy estimate.
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MD5 hash generator
Calculate the MD5 hash of UTF-8 text in your browser. MD5 is broken for security, so use it only for checksums and legacy lookups.
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SHA-1 hash generator
Calculate the SHA-1 hash of UTF-8 text with Web Crypto. SHA-1 is not collision resistant, so do not use it for signatures or passwords.
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IP subnet calculator
Calculate the network, broadcast, usable host range, masks and host count for an IPv4 CIDR block. Handles /31 and /32 per RFC 3021.
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IPv4 address converter
Convert IPv4 addresses between dotted decimal, 32-bit integer, hex and binary, one per line. Octets with leading zeros are rejected.
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IPv6 address expander and compressor
Expand compressed IPv6 addresses to all 8 groups and compress them to the RFC 5952 canonical form. Keeps zone IDs and prefixes and handles embedded IPv4.
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MAC address formatter
Reformat 48-bit MAC addresses with colons, hyphens, Cisco dots or no separators, and show unicast or multicast and local or universal bits. No vendor lookup.
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Password strength checker
Estimate password strength from length, character types and common patterns, with rough guess-time ranges and advice. Runs locally; nothing is sent.
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Random token generator
Generate cryptographically random tokens from 8 to 128 bytes as hex, Base64, Base64url or alphanumeric text, using crypto.getRandomValues.
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