Security tools
Local-first tools for hashes, keys, JWTs, signing, encoders, DNS lookups, and defensive security workflows.
URL Defang / Refang Tool
Safely defang or refang URLs, domains, and IP indicators for security analysis.
SSL Certificate Decoder
Parse PEM SSL certificates locally and inspect subject, issuer, SAN, dates, and fingerprints.
CIDR Calculator
Calculate IPv4 and IPv6 CIDR ranges, masks, address counts, and subnet splits.
URL Encoder and Decoder
Encode, decode, and parse URL text or query strings without requesting the URL.
Hash Generator
Generate SHA-256, SHA-512, SHA-1, and MD5 hashes for text or files locally.
IOC Extractor
Extract URLs, domains, IP addresses, and hashes from security reports, logs, and pasted text.
CSR Decoder
Decode certificate signing requests locally and review CN, SAN, algorithms, and key details.
Base64 Encoder and Decoder
Encode and decode Unicode text, URL-safe Base64, and small local files in your browser.
JWT Decoder
Decode JWT header and payload locally and inspect exp, iat, and nbf timestamps.