# URL Diagnostics

> Free, focused tools and source-reviewed guides for cleaning URLs, measuring campaigns, and checking crawler, indexability, sharing, sitemap, and security signals.

This is a maintained map of canonical public pages, not a crawler-control or ranking file. Provider adoption varies; robots.txt controls crawl permissions, and Google Search does not use llms.txt for visibility or rankings.

## Start here

- [URL Diagnostics](https://urldiagnostics.com/): Free tools to clean tracking links, build UTM and QR campaigns, trace redirects, check AI crawler access, and create llms.txt files. No signup required.

## Tools

- [URL Tracking Cleaner](https://urldiagnostics.com/url-cleaner): Turn long tracking links into clean, shareable URLs without removing parameters the destination actually needs.
- [Clean UTM Builder](https://urldiagnostics.com/utm-builder): Build consistent campaign links that keep GA4 reports readable across paid, social, email, partner, and print channels.
- [QR Campaign Link Builder](https://urldiagnostics.com/qr-campaign-link-builder): Create measurable QR campaigns for flyers, menus, packaging, posters, events, and business cards.
- [Redirect Chain Checker](https://urldiagnostics.com/redirect-checker): Follow every HTTP redirect between a starting URL and its final destination, with warnings that matter for users and SEO.
- [AI Bot Access Checker](https://urldiagnostics.com/robots-ai-checker): See how your robots.txt rules affect search crawlers, AI answer engines, and model-training bots.
- [llms.txt Generator](https://urldiagnostics.com/llms-txt-generator): Create a concise, machine-readable guide to the pages that best explain your business, product, or publication. llms.txt is a voluntary convention, not a ranking or crawler-control signal.
- [Sitemap Health Checker](https://urldiagnostics.com/sitemap-checker): Find and validate public XML sitemaps, then sample URL health and crawler conflicts within safe scan limits.
- [Security Headers Checker](https://urldiagnostics.com/security-headers-checker): Grade high-signal HTTP security headers and get conservative, copy-ready hardening guidance for your stack.
- [URL Indexability & Canonical Inspector](https://urldiagnostics.com/indexability-checker): See why one URL might not be crawled, chosen as canonical, or indexed — robots.txt, noindex, canonical, and hreflang signals for browser and bots.
- [Social Preview Checker](https://urldiagnostics.com/social-preview-checker): Inspect Open Graph and Twitter/X metadata, verify the share image, and preview common social cards.
- [Shopify Handle Generator](https://urldiagnostics.com/shopify-handle-generator): Turn Bulgarian Cyrillic and mixed-script product titles into clean Shopify-safe URL handles in your browser.

## Guides

- [URL Diagnostics guides](https://urldiagnostics.com/guides): Browse source-reviewed URL Diagnostics guides for AI crawler policy, GA4 campaign tracking, QR links, and safer Shopify URL changes.
- [How to check whether AI crawlers can access your website](https://urldiagnostics.com/guides/check-ai-crawler-access): Audit one public URL against the applicable robots.txt group, then verify that the delivery layer permits the request.
- [GPTBot vs OAI-SearchBot vs ChatGPT-User](https://urldiagnostics.com/guides/gptbot-vs-oai-searchbot): Choose the correct OpenAI user agent for ChatGPT search, potential training collection, or a user-requested visit.
- [A GA4 UTM naming convention that stays clean](https://urldiagnostics.com/guides/ga4-utm-naming-convention): Set one durable rule for UTM fields, casing, separators, ownership, and inbound-link tagging across the team.
- [How to track QR codes in GA4 without fooling yourself](https://urldiagnostics.com/guides/track-qr-codes-in-ga4): Plan a tagged destination and editable redirect, test the printed code, and distinguish scans from visits and key events.
- [Shopify хендъли на кирилица: безопасна смяна без загуба на SEO](https://urldiagnostics.com/bg/guides/shopify-handles-kirilitsa-latinitsa): Review Bulgarian-to-Latin handle suggestions, resolve duplicates, and verify Shopify redirects before changing a live catalogue.