DLsite Link Converter by tebukuro

Detects DLsite work IDs (RJ / RE / VJ / BJ followed by 6 or more digits)
written anywhere on a page and turns them into links to the matching DLsite
product page. Even when only the ID is posted on social media or forums, you
can open the product page with a single click.

■ Features
・Automatically links work IDs (RJ: doujin / RE: doujin for overseas /
VJ: bishoujo games & PC software / BJ: e-books & commercial titles)
・DLsite automatically redirects each link to the correct store
・Existing links and text inside scripts are left untouched
・Clicking a converted link records the work title, ID, date, and source page
as history
・View and clear the history from the toolbar icon

■ Privacy & Safety
・Page text is read only to find IDs; nothing is stored or transmitted
・The only external request is sending the work ID (and nothing else) to
DLsite to fetch the title when you click a link. No data is sent to any
server other than DLsite
・Click history is stored only in your browser; no one, including the author,
can see it
・No account, no ads, no usage tracking

■ Permissions
・"Access your data for all websites": needed to find and linkify IDs on any
page (page content is never stored or sent)
・"Access your data for www.dlsite.com": used only to fetch work titles

■ Open source
Full source code is available:
https://github.com/tebukurokun/rj-link-converter

Note: This is an unofficial tool and is not affiliated with DLsite.