A bench of small tools
Generate test certificates, convert timestamps and units, tidy JSON, and fill forms with fake data. Nothing is stored. Private keys never hit disk.
RSA certificates
Self-signed root, intermediate, keys, and an optional leaf for local TLS.
Unix time
Seconds and milliseconds, both directions, with timezone display.
JSON
Beautify or minify, with a clear parse error when the input is wrong.
Test cards
Luhn-valid sandbox numbers from published test IINs. Not real cards.
Random text
Lorem ipsum or English filler, by word count.
Units
SI, imperial, nautical, troy, and digital storage — any pair in the same dimension.