A bench of small tools
Generate test certificates, inspect PEMs and JWTs, hash or encode data, make QR codes, convert timestamps and units, explain CIDR and cron, and fill forms with fake fixtures. When you log in, you can also make REST API calls directly from the site. Your tool input is never stored. Private keys never hit disk.
Crypto and TLS
certificates Self-signed root, intermediate, keys, and an optional leaf. RSA, ECDSA P-256, or Ed25519.
inspect pem Subject, SAN, issuer, dates, and key type. Private key bytes are not shown.
jwt Decode header and payload, with exp/iat in your timezone. Never verified.
hashes MD5, SHA-1, SHA-256, and SHA-512 of text or a small file.
Data
json Beautify, minify, escape a string, or check valid/invalid without rewriting.
base64 / url Encode or decode, with hints when the input looks like JWT, PEM, or hex.
ids UUID v4, time-ordered v7, or snowflake IDs with a chosen epoch.
qr code Turn a URL or any text into a PNG, with optional circular modules and a centre logo.
Fixtures
test cards Random sandbox Luhn numbers, or published Stripe success and decline cards.
fake identity Names, emails, phones, addresses, and user agents for form filling.
random text Lorem ipsum or English filler, by word count.