Text Processing
Convert text line endings between LF (Unix/macOS), CRLF (Windows), and CR (classic Mac). Normalizes mixed endings in one pass and reports the original breakdown.
line-ending-converterValidation
Validate or generate numbers using the Luhn algorithm (mod-10). Works for credit cards, IMEI, IMEISV, SIN, NPI and any custom Luhn-based identifier.
luhn-checksumDevelopment
Statically check Markdown links for format errors, broken anchors, and undefined references (no network requests)
markdown-link-checkerText Processing
Lint Markdown against ~15 markdownlint rules plus 2 Chinese-typography rules, with line-located reports and one-click auto-fix of safe issues
markdown-lint-style-checkerNetwork
Look up the manufacturer of a MAC address from the IEEE OUI database, or reverse-search a company name to list all its OUI blocks — fully offline
mac-oui-vendor-lookupMath & Numbers
Convert kilometers per liter to miles per gallon with configurable decimal precision
kml-to-mpgMath & Numbers
Convert liters per 100 kilometers to miles per gallon with configurable decimal precision
l-per-100km-to-mpgMedia
Convert Leica RAW files to JPEG format. Automatically extracts image dimensions and metadata from the RAW file.
leica-raw-to-jpgMedia
Convert Leica RAW files to PNG format. Automatically extracts image dimensions and metadata from the RAW file.
leica-raw-to-pngMath & Numbers
Convert kilopascals to standard atmospheres with configurable decimal precision
kpa-to-atmMath & Numbers
Convert kilopascals to bar with configurable decimal precision
kpa-to-barMath & Numbers
Convert kilopascals to millimeters of mercury with configurable decimal precision
kpa-to-mmhg