wallabag is a read-it-later application: it saves a web page by keeping content only. Elements like navigation or ads are deleted.

The main documentation for this application is organized into multiple sections:

user-related docs
apps-related docs
administator-related docs
developer-related docs

This library provides a generic NetscapeBookmarkParser class that is able of parsing Netscape bookmarks as exported by common Web browsers and bookmarking services.

ArchiveBox is a powerful, self-hosted internet archiving solution to collect, save, and view sites you want to preserve offline.

You can set it up as a command-line tool, web app, and desktop app (alpha), on Linux, macOS, and Windows.

You can feed it URLs one at a time, or schedule regular imports from browser bookmarks or history, feeds like RSS, bookmark services like Pocket/Pinboard, and more. See input formats for a full list.

It saves snapshots of the URLs you feed it in several formats: HTML, PDF, PNG screenshots, WARC, and more out-of-the-box, with a wide variety of content extracted and preserved automatically (article text, audio/video, git repos, etc.). See output formats for a full list.

The goal is to sleep soundly knowing the part of the internet you care about will be automatically preserved in durable, easily accessible formats for decades after it goes down.

🗃 The open source self-hosted web archive. Takes browser history/bookmarks/Pocket/Pinboard/etc., saves HTML, JS, PDFs, media, and more... - pirate/ArchiveBox

$12/yr

Can I import my bookmarks from other services?
Yes! You can import from any of the major services. Importing is located in Settings here: Import bookmarks

Can I export my bookmarks?
Yes! You can easily export your bookmarks to the html file that can be imported elsewhere (Chrome, Firefox, Safari, etc.). You can also sync a backup of this exported html file with Dropbox

Is there a way to get rid of duplicates?
Yes! You can git rid of duplicates using the duplicate resolver here: Duplicate resolver

Alternatives -- Eversync, Floccus, Ymarks

Comments on Eversync -- tedious to login and then initiate sync every time opening browser

Comment recommends Bookmarks OS ($1/mo)

ymarks is a two-component KISS bookmark synchronization service, it consists of a server component which you'll have to run anywhere and a client component which will have to be installed in your browser(s). Its name is a pun on the (now defunct) Xmarks service.
Which browsers are supported?
By the time of writing, ymarks semi-officially supports Mozilla Firefox and Vivaldi. Rumors suggest that Google Chrome, Opera and Microsoft Edge might or might not work as well.

import/export issues discussion

This will download your bookmarks from https://www.google.com/bookmarks, or a HTML backup file, and add them to supported browsers on your device. Delete and share bookmarks.

*** Importing, exporting, backing up, and restoring folder structure is not possible in Chrome