Lint Dockerfiles against 20+ valid instructions (FROM, RUN, CMD, COPY, ENTRYPOINT, HEALTHCHECK, SHELL). Detects unknown instructions and missing FROM declaration. Code never leaves your device — formatting and validation run locally in your browser.
Content reviewed October 2026 · About Toolzum
Lint HTML for missing DOCTYPE, unclosed tags, and unexpected closing tags. Paste your HTML and get instant feedback. Catch errors before browsers guess wrong — free, local, no signup.
Check a domain name across major TLDs against authoritative RDAP servers — a missing record means likely available. TLDs without RDAP fall back to a DNS heuristic. Always confirm with a registrar before purchasing.
Validate GraphQL schema syntax and structure. Detect missing root types, unknown type references, and common schema issues.
Clean up messy audio transcript dumps into readable articles or scripts with AI — paste raw text, pick article or script format. Podcasters turn 5,000 garbled words into publishable copy — 1 credit per cleanup.
Preview your text in 6 Google fonts — Inter, Playfair Display, Fira Code, Pacifico, Outfit, and Montserrat — and copy the ready-to-use CSS import plus font-family rule. Free, local, no signup.
Missing tags (:latest), root users, cache-busting order, and secret leaks.
Digests beat tags — immutable references only, never floating majors.
Recognized and scored — builder patterns get proper treatment.
No — linting runs locally in your browser, free with no signup.
Docker Compose Validator
Validate docker-compose.yml — YAML syntax, indentation, tabs, and services presence. Catch the tab indent breaking deploys — local validation, free, no signup.
Docker Run to Compose Converter
Convert docker run commands to docker-compose.yml format. Supports ports, volumes, environment variables, networks, restart policies, and container names.