Validate robots.txt syntax — user-agents, allow/disallow, sitemaps, wildcards. Catch the Disallow: / that deindexed everything — local validation, free, no signup.
Content reviewed October 2026 · About Toolzum
Validate DNS records — A, MX, TXT, SPF, DKIM, DMARC syntax and coherence. Catch the missing SPF that tanks deliverability — local checks, free, no signup.
Validate docker-compose.yml — YAML syntax, indentation, tabs, and services presence. Catch the tab indent breaking deploys — local validation, free, no signup.
Validate CSS syntax — unclosed braces, bad properties, bad values — with line numbers. Catch the missing } breaking layouts — local validation, free, no signup.
Generate valid robots.txt with user-agents, allows, disallows, and sitemap lines. Never accidentally deindex with Disallow: / — local generation, free, no signup.
Validate IBAN structure, length, and mod-97 check digits for 80+ countries. Catch transfer typos before money moves — local ibantools work, free, no signup.
A stray 'Disallow: /' (often staged-to-prod leftover) deindexes entire domains. The validator flags global disallows and contradictory rules immediately.
Google supports * wildcards and $ end-anchors; not all crawlers do. Keep critical rules to plain prefixes for universal bots.
List sitemap URLs absolutely (https://…) — one line each. Validators confirm reachability, not just syntax.
No — validation runs locally in your browser. Nothing leaves your device.
security.txt Generator
Generate RFC 9116 security.txt files with contact, policy, and expiry fields. Give researchers a reporting path — local generation, free, no signup.
Sitemap Validator
Validate XML sitemaps — checks urlset/sitemapindex root, loc entries, XML declaration, and URL count. Supports standard sitemap protocol formatting.