Cron, chmod, MIME, headers and references. · 19 tools
Parse cron expressions with next runs.
Build cron expressions from dropdowns.
Calculate Unix file permissions.
Searchable HTTP status code reference.
Search MIME types by extension.
Calculate and convert aspect ratios.
Preview social media share cards.
Preview web-safe and Google Fonts.
Minify CSS or JS with stats.
Visualize pixel spacing scales.
Place screenshots in device frames.
Convert curl commands to fetch or Python.
Parse a user-agent into browser and OS.
Analyze and explain HTTP headers.
Score any selector and see which rule wins.
See the key, code and modifiers for any keypress.
Compare versions, test npm ranges and plan the next bump.
Search well-known TCP and UDP ports.
Build README badges as inline SVG, no external service.