Preload and Preconnect Tag Generator
A preload and preconnect tag generator writes resource hint tags for the head of your page. Enter the files you want the browser to fetch early, or the other domains it should connect to in advance, and this free tool writes preload, preconnect and dns-prefetch tags with the right as, type and crossorigin attributes, and warns about common mistakes.
Separate fields with |. Available 'as' values: font, style, script, image, fetch.
Origin only (scheme + host). Path is removed with a note.
Origin only.
Resource Hint Tags
What is a preload and preconnect tag generator and when should you use it?
Resource hints tell the browser about work it can start early: preload fetches a file the page will need, preconnect opens a connection to another domain, and dns-prefetch looks up a domain's address. They are web standards, not search engine rules, and they help only when used for resources the page really needs. Check the rest of your head with the Meta Tags Extractor, and your favicon tags with the Favicon HTML Generator.
How do you use it?
- Add the files to preload and choose their type.
- Add domains to preconnect or prefetch.
- Fix any warnings.
- Copy the tags into the head and measure your page before and after.
Working on a comprehensive technical audit? Browse all free SEO tools to discover the next step in your workflow, or contact our technical support team if you require a specialized custom utility.
Result interpretation & practical applications
When evaluating the output of the preload and preconnect tag generator, review the parsed metrics against your specific site architecture. Outputs are formatted for direct implementation into your HTML source, web server configuration, or Google Search Console audit files.
Always inspect generated values for contextual nuance. Automated tools highlight structural patterns, but manual verification confirms that technical directives align with your overarching SEO strategy.
Technical rules and limitations
- A preload link needs an as attribute.
- Fonts loaded with preload need the crossorigin attribute.
- preconnect and dns-prefetch take an origin, not a full path.
- The same origin in preconnect and dns-prefetch is allowed; note that some sites use both.
- More than a user-typed number of preloads (empty by default).
- No claims about speed.
MDN's references for rel=preload and rel=preconnect.
Common mistakes and troubleshooting
- Preloading files the page doesn't use.
- Forgetting crossorigin on fonts.
- Preloading too many files at once.
No tool can promise how a search engine will crawl, index, or rank your pages. This tool generates and validates code against documented technical specifications; you determine where to deploy it, and you should always test changes on staging environments first. Google publishes extensive guidelines in Search Central on evaluating third-party SEO tools and advice. Learn more about our technical testing standards on our about us page, or explore full site audits on our pricing page.
Related free tools & workflows
Browse all Advanced On-Page SEO Tools →Technical SEO Audit Workflows
Indexability & Crawling
Redirects & HTTP Headers
Authoritative Technical Documentation & Standards
This tool executes logic aligned with official technical documentation and search engine webmaster standards:
- MDN Web Docs rel="preload" documentation
MDN Web Docs: Preloading Content with rel="preload"
Primary engineering source and technical documentation.
- MDN Web Docs rel="preconnect" documentation
MDN Web Docs: Preconnecting with rel="preconnect"
Primary engineering source and technical documentation.
Preload and Preconnect Tag Generator questions
Will this make my site faster? ↓
Only if the hints match resources the page really needs; measure before and after.
Why does a font need crossorigin? ↓
Fonts are fetched in CORS mode, so the preload must match.
preconnect or dns-prefetch? ↓
preconnect does more work early; dns-prefetch only looks up the address.
Is this tool free? ↓
Yes. It is completely free to use and requires no registration or subscription.
Does this tool visit my website or store my files? ↓
No. It executes entirely in your local browser runtime. Your inputs and results are never stored or logged on our servers.
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