Can I Register DOIs for Articles I Already Published?

Q: Can I register DOIs for articles I already published?

Yes. Crossref DOI registration is not limited to new articles - you can deposit metadata for your entire back catalogue once your journal has a prefix. This is called backfile registration, and it lets older issues gain the same permanent-link and citation-tracking benefits as new content. Your DOI service or sponsor prepares and submits the metadata for each back issue in the same way as new articles.

Quick Answer

Yes. Crossref DOI registration is not limited to new articles - you can deposit metadata for your entire back catalogue once your journal has a prefix. This is called backfile registration, and it lets older issues gain the same permanent-link and citation-tracking benefits as new content. Your DOI service or sponsor prepares and submits the metadata for each back issue in the same way as new articles.

What Is Backfile Registration?

Backfile registration is the process of assigning DOIs retroactively to articles that were published before your journal had a Crossref prefix. There's no cutoff date or age limit - journals with years or even decades of back issues can register the entire archive.

How It Works

Get your DOI prefix first - see how to get a Crossref DOI prefix if you don't have one yet.
Compile your back-issue metadata: article titles, authors, publication dates, issue/volume numbers, and page ranges for each archived article.
Suffixes are assigned to each back article, typically following the same pattern used for new content.
Metadata is deposited and verified in batches, same as new-article registration.

Why Bother Registering Old Articles?

Consistent citability - readers citing your journal get a stable DOI regardless of publication year.
Better indexing - many databases and indexing bodies expect DOI coverage across a journal's full archive, not just recent issues.
Citation tracking - Crossref's citation-linking network only tracks references to content that has a DOI.
Professional completeness - a journal with DOIs only on recent issues can look inconsistent to reviewers and indexing committees.

Pricing note: Backfile DOIs are typically priced the same as new-article DOIs (per-DOI packages), so registering 100 back-catalogue articles costs the same as registering 100 new ones. See current DOI pricing.

What If Your Journal's Website Has Changed?

If your website URLs have changed since those articles were first published (a common issue when migrating platforms), you'll need to make sure each DOI resolves to the article's current URL, not a dead link. See Step-by-Step Guide to Updating Article URLs for Crossref DOI if you're also migrating platforms.

Common mistake: Registering backfile DOIs but forgetting to add them to the actual article pages on your website (in the citation block, PDF header, or metadata tags). A DOI that resolves correctly but isn't displayed on the article itself is far less useful to readers and citation tools.

Full Metadata Deposit Process

For the complete technical process of preparing and submitting metadata (new or backfile), see How to Register and Deposit Crossref DOI.