It feels like a glitch when the numbers don't add up, but there is actually a logical (albeit slightly technical) reason for the discrepancy.
The short answer is that
"Delete browsing data" counts individual cookie files and shared tracking resources, while
"See all site data and permissions" groups everything by the "Owner" domain.
Here is the breakdown of why you see a higher number in the deletion menu:
1. The "Grouping" vs. "Counting" Logic
- See all site data: This menu focuses on origins. If you visit
google.com, it might show as one entry. Even if that one entry contains 10 different cookies (for preferences, security, etc.), it often counts as "1 site."
- Delete browsing data: This counts the total number of individual cookie items. If that same
google.com visit generated 10 cookies, the deletion counter will show "10 cookies," whereas the site data list just shows the "1 site" that owns them.
2. Third-Party "Ghosts"
When you visit a single website, it often loads content from other domains (ads, analytics, or social widgets).
- Site Data & Permissions: Chrome often filters this list to show you the "top-level" sites you actually interacted with.
- Delete Browsing Data: This menu is an "all-call." It catches the tiny tracking cookies from 3rd-party ad servers (like
doubleclick.net) that were loaded in the background. Even in a "fresh" instance, visiting just one news site can instantly drop 50+ 3rd-party cookies onto your device.
3. Service Workers and "Other Data"
The "Delete browsing data" category is technically labeled
"Cookies and other site data." That "other" is doing a lot of work. It includes:
- Service Workers: Background scripts used for notifications or offline support.
- Web SQL / IndexedDB: Small databases that sites use to store info.
- Cache API: Different from your "Images and Files" cache, this stores specific site assets. These often don't appear in the "Site Data" list as individual cookies, but they are bundled into the total count in the deletion tool.
Summary Table
| Feature | What it shows | Why the number is lower/higher |
| See all site data | A list of websites | Groups many files under one domain name. |
| Delete browsing data | A count of items | Counts every individual cookie, script, and database file separately. |
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In short: You aren't seeing "extra" data that shouldn't be there; you're just seeing the "Delete browsing data" tool be much more honest about the sheer volume of individual tracking and storage files a single website can leave behind.