How to Get an ISBN in the UK

What Is an ISBN?

An ISBN (International Standard Book Number) is a unique 13-digit identifier assigned to every edition of a published book. Think of it as your book's passport — it's how bookshops, libraries, wholesalers, and online retailers identify, catalogue, and order your specific title. Without one, you're basically invisible to the UK book trade.

ISBNs were introduced in 1970 by the International Organization for Standardization (ISO standard 2108). The system was originally 10 digits but switched to the current 13-digit format in 2007 to expand capacity.

In the United Kingdom, ISBNs are issued exclusively by the Nielsen ISBN Store, which is the UK's designated ISBN agency under the International ISBN Agency. You cannot legally issue your own ISBN or use ISBNs purchased from agencies in other countries if you're publishing as a UK-based publisher.

Why ISBNs matter

• Required for listing in Nielsen BookData (UK's bibliographic database)
• Required for Gardners and Bertrams wholesale catalogues
• Required for Waterstones, WHSmith, and independent bookshop ordering systems
• Required for UK public library cataloguing and Public Lending Right (PLR)
• Required for legal deposit compliance with the British Library
• Enables accurate sales tracking through Nielsen BookScan
• Creates a permanent, unique record of your book's existence

ISBN Structure Explained

Every ISBN is a 13-digit number with five distinct parts, each separated by hyphens. Understanding the structure helps you verify ISBNs and understand what they tell you about a book.

The five parts of an ISBN

1. Prefix element (978 or 979) — The EAN prefix. Currently, most ISBNs use 978 (known as "Bookland"). As 978 numbers run out, 979 is being introduced. The prefix 979 is already in use for ISBNs in some countries.
2. Registration group (0 or 1 for English-language) — Identifies the language or geographic region. For English-language books (UK, US, Australia, Canada, etc.), this is 0 or 1. Group 0 is the original English-language block; group 1 was added as capacity expanded. A UK-issued ISBN will have a group identifier of 0 or 1.
3. Registrant element (publisher prefix) — Identifies the specific publisher. When you buy ISBNs from Nielsen, you're assigned a publisher prefix. Larger publishers have shorter prefixes (more ISBNs available); smaller publishers have longer prefixes.
4. Publication element (title number) — Identifies the specific edition within your publisher prefix. This is the number you assign to each book/edition.
5. Check digit — A single digit calculated from the preceding 12 digits using a modulus-10 algorithm. This catches transcription errors.

Examples of UK ISBNs

978 vs 979 prefix

The ISBN system is gradually transitioning from the 978 prefix to include 979. Key differences:

• 978 — The original "Bookland" prefix. Most ISBNs currently in circulation use 978. ISBN-10 numbers (the old 10-digit system) can only be converted to/from 978-prefix ISBN-13s.
• 979 — The expansion prefix. Being rolled out as 978 allocations fill up. ISBNs with a 979 prefix have no ISBN-10 equivalent. The 979-8 block is already in use (primarily by Amazon KDP in the US). The 979-1 block is allocated to French-language publishers.

For UK publishers, Nielsen currently issues ISBNs from the 978-0 and 978-1 blocks. You may eventually receive 979-prefix ISBNs as the system evolves.

Nielsen ISBN Pricing (2026)

Let's talk money. The Nielsen ISBN Store is the only authorised source for UK ISBNs, and honestly, they're not cheap. Here are the current pricing tiers:

How many ISBNs do you actually need?

Here's a realistic breakdown for common publishing scenarios:

International comparison — UK ISBNs are expensive

To put Nielsen's pricing in context, here's how the UK compares to other countries:

UK ISBNs are expensive by international standards, though not as costly as single US ISBNs. The 10-pack at £164 is significantly better value than Bowker's 10-pack at $295 USD. Countries like Canada and Australia offer free ISBNs — UK authors aren't so lucky.

Step-by-Step: Buying ISBNs from Nielsen

Here's the complete walkthrough for purchasing ISBNs from the Nielsen ISBN Store and assigning them to your books.

Step 1: Create your Nielsen account

1. Go to nielsenisbnstore.com
2. Click "Register" or "Create Account"
3. Enter your details:
   • Name — your legal name or company name
   • Email address — used for account access and notifications
   • UK address — your business or home address
   • Phone number — required for account verification
4. Verify your email address by clicking the confirmation link

Step 2: Choose your ISBN package

1. Log in to your Nielsen account
2. Go to "Buy ISBNs"
3. Select your package:
   • 1 ISBN — £89
   • 10 ISBNs — £164 (recommended)
   • 100 ISBNs — £369
   • 1,000 ISBNs — £1,849

Step 3: Set up your imprint name

This is crucial — your imprint name is the publisher name that appears in all bibliographic databases, bookshop catalogues, and on your book's copyright page.

• Choose a professional-sounding imprint name (e.g., "Riverside Press", "Ashwood Publishing", "Your Name Books")
• Avoid names that are already in use by established publishers
• This name is permanent and attached to your ISBN prefix — choose carefully
• You can have multiple imprints under one account if needed

Step 4: Complete payment

1. Review your order (ISBN package + imprint details)
2. Pay by credit or debit card (Visa, Mastercard, American Express accepted)
3. Your ISBNs are delivered immediately to your account dashboard
4. You'll receive an email confirmation with your publisher prefix and ISBN range

Nielsen issues ISBNs instantly — there's no waiting period. You can begin assigning them to books right away.

Step 5: Assign an ISBN to your book

1. In your Nielsen dashboard, go to "My ISBNs" or "Assign ISBN"
2. Select an unassigned ISBN from your allocation
3. Enter the book's bibliographic metadata:
   • Title and subtitle
   • Author name(s) — as you want them to appear
   • Format — paperback, hardcover, ebook (PDF), ebook (EPUB), etc.
   • Trim size — e.g., 129×198mm (B-format), 135×216mm (Royal)
   • Page count
   • Publication date
   • Price — RRP in GBP
   • Subject classification — using BIC or THEMA codes
   • Description/blurb
   • Language
4. Submit the record — it feeds into Nielsen BookData within 24–48 hours

Step 6: Download your barcode

After assigning an ISBN, you can generate and download an EAN-13 barcode directly from your Nielsen account. This barcode goes on your book's back cover. See the barcode generation section below for details.

Step 7: Register with Nielsen BookData (Enhanced)

Nielsen offers two levels of bibliographic registration:

• Basic — included free with ISBN purchase. Covers title, author, ISBN, format, and price.
• Enhanced — includes cover image, full description, author biography, review quotes, and more. Dramatically increases discoverability. Enhanced registration is included free when you buy ISBNs from Nielsen.

Always complete the Enhanced record. It's free and makes your book significantly more visible to the trade.

When You Need Multiple ISBNs

"Can I use the same ISBN for my paperback and ebook?" We hear this one constantly. The answer is a firm no. Here's when you need separate ISBNs and why.

Each format = separate ISBN

The fundamental rule: every distinct edition or format of a book requires its own ISBN. This includes:

Common publishing scenarios

Scenario 1: Fiction author publishing a novel
Paperback (B-format) + ebook = 2 ISBNs. If you later add a hardcover, that's a 3rd. If it does well and you release an audiobook, that's a 4th.

Scenario 2: Non-fiction author with a series
3 books × (paperback + ebook) = 6 ISBNs. Add hardcovers and you're at 9. A series box set (print) needs its own ISBN too.

Scenario 3: Children's book author
Picture book (colour, large format) + ebook = 2 ISBNs. If you release a smaller-format paperback for a different market, that's a 3rd.

Your Own ISBN vs Free Platform ISBN

Should you buy your own Nielsen ISBN or use a free one from a publishing platform? This is genuinely one of the biggest decisions for UK self-publishers, and there's no single right answer.

Detailed comparison

When to buy your own ISBN

• You want your own imprint name in trade databases
• You plan to distribute through multiple channels (Books.by + IngramSpark + Amazon)
• You're building a publishing brand or small press
• You want full control over metadata and portability
• You plan to approach Waterstones or independent bookshops directly

When a free platform ISBN is fine

• You're publishing your first book and want to minimise upfront costs
• You're selling primarily through one platform (e.g., Books.by direct sales)
• You don't plan to approach physical bookshops for wholesale distribution
• The platform handles everything — you just want to get your book out there

ISBN vs ISSN vs DOI

These three identifiers serve different purposes in the publishing world. Here's how they differ and when each one applies.

When you might encounter each

ISBN — If you're publishing a book (print or ebook), you need an ISBN. This is the standard identifier for monographic publications — items published as a single, complete work.

ISSN — If you're publishing a periodical (magazine, journal, newsletter series), you need an ISSN instead of (or in addition to) an ISBN. An annual anthology series, for example, might need both: an ISSN for the series and individual ISBNs for each volume. Apply for a UK ISSN free of charge through the British Library ISSN UK Centre.

DOI — Primarily used in academic publishing to create permanent links to digital content. If you're self-publishing academic work, a DOI from Crossref ensures your work is permanently citable and findable. Most trade book authors don't need DOIs.

Barcode Generation

Every printed book needs a barcode on its back cover. The barcode encodes your ISBN in a machine-readable format so that retailers, wholesalers, and libraries can scan and identify your book instantly.

EAN-13 barcode format

Book barcodes use the EAN-13 format — the same system used for barcodes on consumer products worldwide. Your 13-digit ISBN is encoded directly as the barcode number. When scanned at a till in Waterstones or any bookshop, it immediately identifies your book, price, and publisher.

How to generate your barcode

Option 1: Nielsen ISBN Store (included free)

• Log in to your Nielsen account
• Go to the ISBN you've assigned to your book
• Click "Generate Barcode" or "Download Barcode"
• Download in EPS or PDF format (vector format for print quality)
• This is included free with your ISBN purchase

Option 2: Free online barcode generators

• International ISBN Agency barcode tool — official tool
• TEC-IT Barcode Generator — free EAN-13 generator
• Creative Indie Covers — specifically designed for book barcodes

Option 3: Your cover designer

Most professional cover designers will generate and place the barcode as part of the cover design process. Simply provide them with your ISBN and they'll handle the rest.

Option 4: Books.by

If you publish through Books.by, barcodes are generated automatically as part of the cover creation process. You don't need to create one separately.

Barcode placement and specifications

• Position: Lower right area of the back cover (standard placement)
• Size: Minimum 80% magnification (approximately 29.83mm × 21.31mm). Standard is 100% (37.29mm × 26.26mm)
• Quiet zone: Leave at least 3.63mm of blank space on all sides of the barcode
• Colour: Black bars on white background for best scanning reliability
• Format: Use vector (EPS/PDF) for print — never use a rasterised (PNG/JPG) barcode
• Price encoding: UK barcodes typically don't include price in the barcode supplement (unlike US books which sometimes use a 5-digit price add-on)

Nielsen BookData & Discoverability

Nielsen BookData is the UK's most comprehensive bibliographic database. It's the primary tool used by bookshops, libraries, and wholesalers across the UK and Ireland to discover, evaluate, and order books. If your book isn't in Nielsen BookData — or has incomplete metadata — it's essentially invisible to the UK book trade.

Why Nielsen BookData matters

• Gardners (UK's largest wholesaler) uses Nielsen BookData to populate its catalogue
• Bertrams (second-largest UK wholesaler) also relies on Nielsen data
• Waterstones staff search Nielsen BookData when evaluating titles
• Independent bookshops use it to check stock availability and ordering information
• UK public libraries use it for cataloguing and acquisitions
• Amazon.co.uk and other online retailers pull data from Nielsen
• Nielsen BookScan (sales tracking) links to BookData for sales reporting

How to maximise your BookData listing

When you assign an ISBN and enter metadata through your Nielsen account, aim to complete every available field:

1. Title and subtitle — exactly as they appear on your cover
2. Author name — consistent across all your books
3. Description — write a compelling 150–300 word blurb. This is what bookshop buyers read when evaluating your title.
4. Subject codes — use BIC (Book Industry Communication) or THEMA subject codes. Be specific. "Fiction > Thriller > Psychological Thriller" is better than just "Fiction."
5. Cover image — upload a high-quality JPEG of your front cover (minimum 648 pixels on the longest side). Books with cover images get dramatically more attention from trade buyers.
6. Author biography — a brief professional biography
7. Price — your GBP recommended retail price
8. Publication date — be accurate; pre-publication listings build anticipation
9. Page count, dimensions, weight — helps with shelving and shipping calculations
10. Review quotes — add when available

Nielsen BookScan

A related service worth knowing about: Nielsen BookScan tracks point-of-sale data from UK bookshops (including Waterstones, WHSmith, Amazon, and most independents). It covers approximately 90% of UK print book sales. If you have a Nielsen ISBN and your book sells through tracked retailers, those sales will appear in BookScan data. Publishers, agents, and the media use BookScan to evaluate title performance.

British Library Legal Deposit

This is one of the most important legal requirements for anyone publishing a book in the UK — and one of the most commonly missed by self-published authors.

How to send your legal deposit copy

1. Print one copy of your published book (the final, published version)
2. Post it to:
   Legal Deposit Office
   The British Library
   Boston Spa
   Wetherby
   West Yorkshire
   LS23 7BQ
3. Include a note with your name, ISBN, publication date, and contact details
4. Send within one month of your publication date
5. You pay the postage — but you can claim this as a business expense against your book income

The five other legal deposit libraries

In addition to the mandatory British Library deposit, five other legal deposit libraries have the right to request a free copy of any book published in the UK or Ireland:

These five libraries make requests through the Agency for the Legal Deposit Libraries (ALDL). Not every book is requested — the libraries are selective based on their collection policies. In practice, most self-published books receive requests from 2–3 of these libraries.

What happens if they request your book

1. You'll receive a request letter or email from ALDL
2. You must send a copy within a reasonable timeframe
3. You pay the postage (claimable as a business expense)
4. Budget approximately £3–£5 postage per library, plus the cost of printing 1–5 additional copies

CIP (Cataloguing-in-Publication)

While handling legal deposit, also consider applying for CIP data from the British Library. CIP provides standardised cataloguing information that you print on your copyright page. It makes it easier for libraries to catalogue your book — increasing the likelihood of library purchases.

• Apply through the British Library CIP programme
• It's free
• Apply at least 3 weeks before your publication date
• Include the CIP data on your book's copyright page

Frequently Asked Questions