You keep your backlinks during a migration by making sure every old URL that other sites link to still leads to the right page, which means a 301 redirect from each old address to its new equivalent. The key realization is what you can and cannot control. You cannot edit links on other people’s sites, so you cannot move them; what you can do is make the destinations they point at continue to work and pass their value. A 301 from an old URL to its new page carries most of that link value across and sends the visitor to the right place, so the backlink keeps working even though the address changed. The danger is letting linked old URLs become 404s, because then both the visitor and the link value hit a dead end. The priority is your most linked pages, since link value is concentrated on a few of them, so identify those first and confirm each has a precise redirect to its true equivalent, not to the homepage. Where a link is especially valuable, it is also worth asking the linking site to update the URL directly. WPBuildAI scans your site and returns the URL list, so you can map every linked page to its new address and leave none behind.

Protecting inbound links now means protecting every entry point, since Google’s June 2026 site move guidance asks for Change of Address requests across all subdomains and both the www and non-www variants of the old domain, and older backlinks very often point at the variant you stopped using years ago.

A backlink is a link on someone else’s site pointing at a specific URL on yours, and it carries two things: referral traffic and ranking value. Both are tied to the exact address it points at. When you migrate and that address changes, the link still points at the old URL, which you no longer control the content of. If the old URL stops working, the link now points at nothing useful. This is why backlinks are fragile in a migration: their value lives on an address you are about to change, and the people who created them are not going to notice or fix it. Protecting them is therefore your job, done from your side, not theirs.

Why the value concentrates on a few pages

Before redirecting everything equally, understand that backlinks are not spread evenly. A small number of your pages usually hold most of your earned links and most of their value, a pattern consistent with how unevenly traffic and links distribute, as the Ahrefs study and the Backlinko analysis both show. That concentration is good news, because it means protecting your backlink value is mostly about getting a handful of pages right. Identify your most linked pages first, treat their redirects as critical, and you have secured the majority of the value before you even reach the long tail. Priority by link value is what makes this manageable rather than overwhelming.

The main tool: a 301 to the true equivalent

The core action is a 301 redirect from each old linked URL to its real new page. A 301 tells search engines the page moved permanently and passes most of the link value to the new address, while sending the human visitor straight to the right content, as the redirects guide describes. The crucial detail is the target: redirect to the page that matches the old one, not to the homepage. A backlink pointing at a specific article earned its value for that article, and bouncing it to the homepage reads as a soft 404, so the value evaporates. Precise, one to one redirects are what keep the link working as if it had never moved.

Map the linked pages first

You cannot redirect what you have not listed. Start with a complete inventory of your URLs, then identify which of them attract backlinks, so each linked address has a defined destination on the new site. A backlink analysis tool can tell you which pages are linked and how valuably, and your URL list, produced by find and extract all URLs, tells you what each becomes after the move. Putting the two together gives you a map: linked old URL on one side, new equivalent on the other. Without that map you redirect from memory and miss linked pages you forgot you had, which is exactly how earned value quietly leaks away in a migration.

Where it is worth asking linkers to update

A 301 retains most of the value, but a link updated at the source is the cleanest outcome, because it points directly at the live URL with no redirect in between. For your most valuable backlinks, the ones from sites that send real traffic or carry real authority, it is worth a short, polite outreach asking them to update the URL to the new address. You will not get every one, and that is fine, because the 301 covers you regardless. The point is to spend outreach effort only where it pays: a few high value links updated directly, and the long tail left to the redirects. Trying to contact everyone is not worth it; covering everyone with a 301 is.

Keep redirects clean and lasting

Backlink value depends on the redirects continuing to work over time, so keep them clean. Each redirect should resolve in a single hop, not a chain, because long chains can dilute value and slow the visitor. Avoid retiring the redirects later in a cleanup, since the external links pointing at the old URLs do not expire, and removing the 301 would strand them. This is the same discipline as any site move: the redirects are not a temporary bridge but a permanent connector for as long as anyone links to the old address. Treat your linked URL redirects as durable infrastructure, not as launch day scaffolding to remove.

  1. List every URL on the old site so nothing linked is missed.
  2. Identify the linked pages and rank them by link value.
  3. Map each linked old URL to its true new equivalent.
  4. 301 each one to that equivalent, never to the homepage.
  5. Ask your top linkers to update the most valuable links directly.
  6. Keep the redirects as single hops and do not retire them later.

Imagine a business migrating a site that has earned links over years. A backlink analysis shows that, out of hundreds of linked URLs, about fifteen pages hold most of the value, including a guide cited by an industry publication and a tool linked from several blogs. The team maps every linked URL to its new address and sets one to one 301s, giving those fifteen pages extra scrutiny to confirm each lands on its exact equivalent. For the guide and the tool, they email the publications and the most prominent bloggers to update the link directly, and several do. The long tail of minor links is covered entirely by the 301s. After the move, the earned ranking value holds, because the destinations kept working, the opposite of what happens when redirects are forgotten.

Limitation: redirects retain value but cannot create it

It is honest to state the ceiling. A 301 retains most of a backlink’s value, but it neither increases that value nor wins you new links, and a sustained chain of redirects can carry slightly less than a direct link, which is why updating the most valuable ones at the source is worthwhile. Redirects also cannot rescue value from a linked page you genuinely delete with no equivalent, because there is nowhere to send it. So preserving backlinks is about keeping what you earned by keeping its destinations alive, not about gaining more. For the detail of how completely a 301 carries value, see does a 301 transfer link equity completely.

Common mistakes

  • Assuming backlinks move with you, when they live on sites you cannot edit.
  • Redirecting linked pages to the homepage instead of their true equivalents.
  • Redirecting from memory without a complete list of linked URLs.
  • Spending outreach effort on every link instead of the few valuable ones.
  • Retiring the redirects later, stranding the external links still pointing at old URLs.

Key points

You keep your backlinks through a migration by protecting the destinations they point at, since you cannot edit the links themselves. Map every old URL that attracts links, prioritize the few pages that hold most of the value, and 301 each linked address to its true new equivalent, never to the homepage. For your most valuable links, ask the source sites to update directly, and let the 301s cover the long tail. Keep the redirects as single hops and do not retire them, because external links to the old URLs never expire. Letting a linked URL become a 404 is what loses the value, the same dead end explored in what changing a site URL does to SEO. WPBuildAI scans your site and returns the URL list, so you can map every linked page to its new address and leave none behind. Send your web address for a free analysis.

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