Sitemap Diff Checker | Compare XML Sitemaps

Sitemap diff checker compares two XML sitemaps and lists every URL added, removed or changed, with lastmod deltas. Paste or upload both. Free. Designed specifically for developers and professionals, this free online seo runs entirely in your browser to process tasks quickly and securely. Enjoy unlimited usage with no data tracking and no registration required.

Also known as: sitemap diff checker · compare two xml sitemaps online · sitemap comparison tool · find urls removed from sitemap · xml sitemap diff online free · sitemap lastmod change checker · compare sitemap before and after deploy · sitemap url difference tool

seo tools

url and link tools

seo

Sitemaps to Compare

Sitemap A (before)

Sitemap B (after)

Diff Report

Added, removed and changed URLs will appear here.

About Sitemap Diff Checker

A deploy that silently drops URLs from your sitemap is one of the easiest SEO regressions to ship and one of the hardest to notice, because nothing errors. This tool compares two sitemap files and tells you exactly which URLs appeared, which disappeared, and which kept the same address but changed their lastmod date, so a release can be checked in seconds rather than eyeballed.

Key Features

Compares two sitemaps and separates added, removed and lastmod-changed URLs
Reads urlset files, sitemapindex files, and plain lists of one URL per line
Tolerates namespace prefixes such as ns:loc that real exports contain
Decodes XML entities so ampersands in query strings compare correctly
Reports a net URL count change so an accidental mass removal stands out
Runs entirely in your browser, so unreleased URLs are never uploaded

Use Cases

Check a staging sitemap against production before a release goes out
Find which URLs a CMS migration quietly dropped from the index
Confirm a pruning pass removed only the pages you meant to remove
Spot a build that stamped a new lastmod on every URL at once
Diff last month's archived sitemap against today's to audit content churn
Verify a new blog section actually made it into the generated sitemap

Supported Formats

XML urlset

XML sitemapindex

Plain URL list

.xml

.txt

Related Keywords

sitemap diff checker

compare two xml sitemaps online

sitemap comparison tool

find urls removed from sitemap

xml sitemap diff online free

sitemap lastmod change checker

compare sitemap before and after deploy

sitemap url difference tool

Why does a removed URL in a sitemap matter so much?

A sitemap is a crawl hint, not an index. Removing a URL from it does not deindex the page, but it does stop telling Google the page is worth recrawling, so updates land more slowly and the page drifts. The bigger risk is what a missing URL usually means: the page was deleted, renamed, or fell out of the build, and the sitemap is the first place that becomes visible. Diff the sitemap on every release and a broken route shows up before a ranking does. If a URL genuinely should go, redirect it rather than dropping it silently.

Privacy & Security

All processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security.

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Frequently asked questions

What is Sitemap Diff Checker used for?

Sitemap diff checker compares two XML sitemaps and lists every URL added, removed or changed, with lastmod deltas. Paste or upload both. Free.

Is Sitemap Diff Checker free to use?

Yes. Sitemap Diff Checker is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use Sitemap Diff Checker?

No. Sitemap Diff Checker works immediately in your browser with no signup, login, or email address required.

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