How to Cite Web Pages That Won't Rot

Citing a web page means asking a stranger to keep a promise: that the page will still be there, unchanged, whenever a reader follows your footnote. The web makes no such promise. Pages get edited, paywalled, moved, and deleted — and citations rot accordingly.

This article is about making citations that hold. It explains what Perma.cc is and why it exists, is clear about when it is the right tool (often), and then covers what the rest of us — researchers, journalists, analysts, students — can use when formal citation infrastructure is more than the job requires.

Citations rot faster than paper ever did

The scale is documented, not anecdotal. A Pew Research Center analysis found that 38% of webpages that existed in 2013 were no longer accessible a decade later.

For legal writing, the problem has its own landmark study. In "Perma: Scoping and Addressing the Problem of Link and Reference Rot in Legal Citations" (Harvard Law Review Forum, 2014), Jonathan Zittrain, Kendra Albert, and Lawrence Lessig found that more than 70% of URLs in the Harvard Law Review and similar journals — and around 50% of URLs in United States Supreme Court opinions — no longer linked to the originally cited information. A citation to a dead or changed page is a claim a reader cannot check, which for law is close to no citation at all.

What Perma.cc is — and when it is the right tool

Perma.cc was created directly in response to that problem. It is a citation-archiving service built and supported by libraries, with records preserved by the Harvard Law School Library. You give it a URL; it captures the page and returns a permanent record — a Perma Link — that courts, journals, and readers cite instead of the fragile original. Law reviews ask authors to attach them to cited URLs, and courts cite them in opinions; the raw link in your footnote becomes a pointer to the frozen copy rather than a promise about the live page.

The Perma.cc documentation and sign-up page describe the access model: members of registrar institutions — many courts, law schools, and universities — get unlimited free service through their library, and new individual accounts receive a small batch of trial links. Beyond that, individual plans start at $10 a month for 10 new links, with larger monthly tiers ($25 for 100 links, $100 for 500) and one-time link packs available.

Be clear about what that buys you, because it is unique: third-party, institutional permanence. The record lives in a registry maintained by libraries — not in your account, your laptop, or any company's goodwill toward a customer. When a citation carries legal weight, that is the guarantee you want, and Perma.cc is the recognised standard for it.

So the honest guidance: if you are filing in court, editing a law review, or citing formally in academic work, and you have access through an institution, use Perma.cc. PagePocket will not pretend to compete with that — our comparison page says the same thing in a table.

What everyone else actually needs

Most citation-rot victims are not filing briefs. A researcher's literature review, a journalist's source list, an analyst's report, a student's essay — all cite pages that can change, but none of them needs a library-grade registry for every link. What they need is:

• a faithful copy of the page as it was when cited;
• privacy by default, with material visible only to them until they choose otherwise;
• the copy findable later — by searching what was written on it, not by re-tracing a bookmark;
• and selective sharing: a stable link for collaborators or readers when the moment comes.

For the daily job — the paper due next week, the report with forty references, the archive of sources behind a series — the questions are different: does the copy exist, is it faithful, can you find it again, can you hand it to someone? Perma.cc answers those for individual links too, at per-link prices; a personal archive answers them for your whole library at once.

That is the job PagePocket was built for. One click saves the full page — complete HTML, styles, images — to a private, searchable library; collections keep a project's sources together; and any save can be shared with a link, optionally expiring, that shows the exact copy you kept. There is a free plan (50 pages a month, 500 MB), and Pro is $2/month billed yearly.

Being equally honest about the differences: PagePocket is a personal archive, not a citation registry. Records live in your account, not in an institution's preservation system — the guarantee is "yours for as long as your account exists", not "preserved by a library independent of you". Perma Links are public records designed to be cited; PagePocket pages are private until you share one. And Perma's permanence is what makes it worth institutional pricing; PagePocket's job — a working archive at $2/month — simply is not the same job.

A rule of thumb

• Formal legal or scholarly citation? Perma.cc — through your institution's registrar access if you have it. It exists precisely so those citations do not rot.
• The page should become public record? The Wayback Machine's Save Page Now gives a free, citable public URL — complements both tools above.
• Everything else — your sources, research, receipts, and drafts? A private archive you control: faithful copies, full-text search, and share links when you decide something is ready to show.

One habit covers the gaps between them: when a page starts to matter, capture it before you need it. Every tool in this article only works on the pages you thought to keep. The journalist's workflow shows what that looks like in practice, and Wayback Machine alternatives for personal archiving compares the wider field.

Keep your next citation

Take the most-cited web page in whatever you are working on right now. Create a free account, save the page, and search for a phrase from your citation — the words should come back from your copy, not the live site. That is the whole test: a citation you can still verify after the web has moved on.