📚 DOI & Crossref DOI Knowledge Base

How do I get a DOI for my journal?

You register your journal with Crossref - the official DOI registration agency for scholarly publishing - either as a direct member or through an authorized Crossref sponsor. Your journal needs a valid ISSN and a working website with published content first.

• Direct membership: $275/year plus $1 per DOI, you handle the metadata deposits yourself.
• Sponsored membership (e.g. through GetDOI/SRND): no annual fee, and the sponsor handles the Crossref account, prefix, and metadata for you.

See the full walkthrough, including prerequisites and a phase-by-phase timeline, in our complete guide to getting a Crossref DOI.

How do I get a Crossref DOI prefix for my journal?

A Crossref DOI prefix (the part before the slash, e.g. 10.xxxxx) is assigned automatically when a Crossref account is set up for your journal - you can't buy or pick one on its own outside membership.

• As a direct member, Crossref allocates your prefix once your $275/year membership is approved.
• Through a sponsor like GetDOI/SRND, the prefix is issued as part of onboarding, typically within 3-5 days, with prefix setup starting from ₹3,990.

For the technical side of designing and managing your prefix structure, see DOI Prefix Management.

What is the difference between a DOI prefix and a DOI suffix?

The prefix (e.g. 10.5555) identifies the publisher or journal and is assigned once by Crossref. The suffix (e.g. j.jss.2026.01.002) identifies one specific article and is chosen by the publisher.

Together they form a permanent identifier such as 10.5555/j.jss.2026.01.002 that never changes, even if the article's URL does. Most journals base their suffix pattern on the journal code, year, issue, and article number so it stays predictable and easy to generate for future articles.

Do I need an ISSN before I can register Crossref DOIs?

Yes. Crossref requires a valid print or online ISSN to identify your journal before approving DOI registration, whether you apply directly or through a sponsor.

If you don't have an ISSN yet, apply for one first - and use that time to prepare your website, editorial board page, and peer-review policy, which Crossref also expects to see. Full requirements are covered in ISSN Requirements for DOI Registration.

How much does a Crossref DOI cost?

Direct Crossref membership costs $275/year plus $1 per DOI, with no waiver for small or new journals.

Direct Crossref membership or sponsored membership - which should I choose?

Choose direct membership if you publish high volumes and have in-house staff who can manage XML metadata. Choose sponsored membership if you want no annual fee, a 3-5 day setup, and hands-on support - the more practical route for most small and mid-sized journals.

See the full comparison table (cost, setup time, support, and technical burden) in How to Get Crossref DOI and Crossref DOI vs Other Identifiers.

How long does it take to get a DOI prefix and start assigning DOIs?

Through a Crossref sponsor, most journals get a prefix and start assigning DOIs within 3-5 business days of submitting their ISSN and journal details.

Can I register DOIs for articles I already published?

Yes. Once your journal has a prefix, you can deposit metadata for your entire back catalogue - this is called backfile registration - so older issues get the same permanent-link and citation-tracking benefits as new content.

See How to Register and Deposit Crossref DOI for the deposit process, and updating article URLs for existing DOIs if you're migrating platforms.

What happens if my journal does not have a DOI?

Your articles rely on ordinary web URLs, which break when a site is redesigned or migrated, making citations unreliable. Journals without DOIs are excluded from Crossref's citation-linking network and can appear less credible to indexing bodies that treat DOI presence as a baseline quality signal.

See Why Every Journal Needs a Crossref DOI for the full case, and Common Mistakes in DOI Registration to avoid the most frequent setup errors.

How do I choose a trustworthy Crossref sponsor?

Verify any sponsor directly on Crossref's official sponsor list before paying, filtering by base country - a legitimate sponsor will be listed there by name.

Beyond that, compare setup time, whether the annual Crossref fee is genuinely waived, what happens to your DOIs if you switch providers later, and whether ongoing metadata support is included rather than billed separately.

What is the difference between a DOI and an ISSN or ISBN?

An ISSN identifies a journal as a whole publication (the title). A DOI identifies one specific article, dataset, or item of content within that journal and resolves directly to it. An ISBN plays the same role as ISSN, but for books.

You typically need an ISSN before Crossref will register DOIs for your journal, but the two identifiers serve different purposes and neither substitutes for the other. See Crossref DOI vs Other Identifiers for a full comparison with Handle, ARK, and other systems.