PortBackLinks resources
Backlink guides
Use these guides to research free backlink sources, review link attributes, and prepare relevant directory submissions.
Free Backlink Submission Sites: Browse Free Sources
Browse active backlink sources marked free in PortBackLinks, review submission details, and choose relevant sites for your outreach.
Free Dofollow Backlink Sites for Outreach
Find free backlink sources whose listed link attribute is normalized as dofollow, then check each destination's current publishing rules.
Free Directory Submission Sites in 2026
Browse free directory-type backlink sources in the PortBackLinks index and review their current listing requirements before submitting.