All tools

Full catalog. Every utility runs in your browser, with no install and without sending your data to a server.

Permissions

chmod calculator
Convert between octal (755), symbolic (rwxr-xr-x) and ls -l style permissions. Supports setuid, setgid and sticky bit.

JSON/YAML

Online JSON validator and formatter
Validate, pretty-print or minify JSON in your browser. Errors show line and column whenever the browser exposes them. Nothing leaves your tab.
YAML to JSON and JSON to YAML Converter
Convert YAML to JSON and JSON to YAML in your browser. Nothing is sent to a server, no tracking, with clear error reporting.

DevOps

Cron expression generator
Build, parse and explain 5-field Unix cron expressions. Computes the next runs in your local time zone.

Networking

CIDR and IPv4 Subnet Calculator
IPv4 CIDR and subnet calculator online: subnet mask, wildcard, network, broadcast, range and usable hosts, computed in your browser.