Translate a cron expression into plain English and see the next run times.

Convert a cron expression into a systemd OnCalendar timer unit.

Generate strong random passwords and diceware passphrases with an entropy meter.

Generate random (v4) UUIDs in bulk, right in your browser.

Compute SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any text.

Encode or decode Base64, with a URL-safe option. UTF-8 aware.

Decode a JSON Web Token's header and payload and read its timestamps.

Percent-encode or decode URLs and URL components.

Turn any text or URL into a downloadable QR code.

Build a .gitignore from common stack and platform templates.

Format, validate, and minify JSON entirely in your browser.

Convert between YAML and JSON in either direction.

Pretty-print SQL for many dialects with keyword casing.

Test a regular expression against text with live match highlighting and groups.

Compare two blocks of text and see added and removed lines.

Convert between Unix timestamps and human-readable dates.

Convert a JSON array of objects to CSV and back.

Convert integers between binary, octal, decimal, and hex.

Convert text between camelCase, snake_case, kebab-case, and more.

Convert between HEX, RGB, and HSL and check WCAG contrast.

Searchable reference of essential Vim commands, modes, and motions.

Searchable reference of common Git commands for everyday work.

Convert Unix file permissions between symbolic, octal, and rwx forms.

Searchable reference of HTTP status codes and what they mean.

Compute network, broadcast, mask, and host range for an IPv4 CIDR block.