Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Home / Web & SEO / Sitemap Checker

Check a sitemap for broken dates, wrong priorities, duplicates and mixed hosts, and find pages missing from it.

Free, no uploads, no sign-up. Runs 100% in your browser.

Generated in your browser from what you type or drop. Nothing is fetched from or sent to your site.

Input: XML, GZ. Output: TXT.

Nothing is fetched from your site, so these tools also work for staging sites and pages behind a login.
Test changes on a staging copy of your site first.

Are my files uploaded?: No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
Is it free? Are there limits or watermarks?: Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
Does it work offline?: Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

XML Sitemap Generator: Make sitemap.xml from a list of URLs or your HTML files, with dates and priorities, split at 50,000 URLs.
Link Extractor: Pull every link from HTML with its anchor text, split internal and external, and spot nofollow and empty links.
robots.txt Generator & Tester: Build a robots.txt with rule groups and sitemaps, block AI crawlers in one tick, and test which URLs are allowed.
Schema Markup Generator: Make JSON-LD structured data for FAQ, Article, Product, Local Business, Event, Recipe, How-to and more.