Tool

Duplicate bookmark finder

Sync a browser across three machines for a few years and you end up with the same page saved four times, in four folders. This finds every copy and gives you a file with one of each.

Drop your bookmarks file here or click to choose — bookmarks.html or a Chrome Bookmarks file

Read locally · never uploaded

When removing duplicates, keep the

Exact duplicates

Same URL once you ignore http/https, www., a trailing slash, #fragments and tracking parameters like utm_source.

URL	Copies	Found in

Same title, different URL

Often the same article saved from a mobile URL, an AMP page or after a site redesign. These are never removed automatically — decide for yourself.

Title	URLs

What counts as a duplicate

Two bookmarks are treated as the same page when their URLs match after normalising:

http:// and https:// are treated as equal
a leading www. is dropped, and the domain is lowercased
a trailing slash is dropped
#fragments are dropped
tracking parameters are dropped — utm_*, fbclid, gclid, mc_cid, igshid, msclkid and friends
remaining query parameters are sorted, so ?a=1&b=2 matches ?b=2&a=1

Paths stay case-sensitive, because on a lot of servers they genuinely are.

The de-duplicated file keeps one copy of each page, in the folder that copy came from, and preserves your folder structure. Import it into a clean profile — or delete your existing bookmarks first — otherwise you'll simply add a second set alongside the old one.