Tiny Tools › URL parameter glossary › srsltid
srsltidShort for search results tracking ID. Google automatically appends srsltid to the landing-page URL when someone clicks a product from Google Shopping free listings or a Merchant Center feed, so the click can be tied back to that specific listing. The value is a long opaque string that means nothing to the destination site.
Safe to remove? Yes. srsltid is used for tracking and reporting only — deleting it does not change the page you land on. Strip it before sharing a link to keep it clean and private.