Vellum vs Atticus: Which Book Formatting Tool Is Best?

Last reviewed by Robert Prime — June 2026

Quick Answer: Vellum is a one-off macOS-only formatter (around $199–$249) that produces premium typography and exports KDP-ready EPUB and print PDF with almost no learning curve. Atticus is a cross-platform writing-and-formatting tool (a one-time $147 purchase) that runs on Windows, Mac, Linux and Chromebook in the browser. Both export clean, KDP-acceptable files: choose Vellum for the most polished output if you own a Mac, and Atticus for platform flexibility and an integrated writing environment. UK authors pay 20% VAT on ebooks and buy ISBNs from Nielsen (£93 single, £174 for ten).

Full comparison, workflows and UK costs below.

Vellum vs Atticus at a glance

Searching it the other way round as Atticus vs Vellum? Same answer - the table above reads identically whichever tool you put first.

Self-publishing has never been more accessible, yet the technical hurdle of book formatting remains a significant pain point for many UK authors. Two tools dominate the conversation among indie authors: Vellum and Atticus. Both promise to simplify the process of creating professional-quality ebooks and print-ready files for platforms like Amazon KDP. But which one truly fits the needs of UK authors, who face unique market conditions, pricing considerations, and ISBN regulations?

Before choosing between Vellum and Atticus, it’s crucial to understand some core concepts and your specific needs as a UK author. The UK self-publishing landscape has nuances that many US-based guides overlook, so let’s set the stage properly.

Terminology and Formats

• EPUB: The industry-standard ebook format accepted by most retailers except Amazon.
• MOBI/AZW3: Amazon Kindle’s preferred ebook formats. Note that Amazon is now shifting towards EPUB acceptance, but MOBI/AZW3 remains widely supported.
• Print-Ready PDF: A file formatted for Print-on-Demand (POD) services like KDP Print, with correct trim size, bleed, and margins.
• Trim Size: The final dimensions of the printed book (e.g., 5" x 8", 6" x 9"). UK printers and distributors expect precise sizing to meet their POD templates.
• Bleed: Printing beyond the trim edge so that colour or images reach the edge of the page.
• ISBN: International Standard Book Number, essential for retail distribution in the UK, purchased via Nielsen Book Services.

Why Formatting Is More Than Cosmetic

Formatting isn’t just about making the book look nice. A poorly formatted file can:

• Get rejected by KDP or other platforms due to non-compliance with their technical requirements.
• Result in wrong page counts, misaligned content, or distorted images that frustrate readers.
• Hurt readability and damage your brand’s reputation.
• Create headaches for marketing and distribution, especially when files need re-submission.

The UK Publishing Landscape

The UK book market is mature and competitive. Key to commercial success is not just writing a good book but formatting it to the stringent UK and international standards.

Vellum Overview

Vellum is a macOS-only application designed for authors who want a polished, professional output with minimal fuss. It excels at creating beautifully typeset ebooks and print books, with a strong emphasis on typography and ease of use.

How to Use Vellum (Mac Only)

1. Import Your Manuscript
   Open Vellum on your Mac, then drag and drop your Word DOCX manuscript file into the project window. Alternatively, use File > Import Manuscript.
2. Choose Your Book Size
   Navigate to Book Settings > Trim Size. Select from standard sizes like 5" x 8" or 6" x 9", or enter custom dimensions to match UK POD specs.
   Pro Tip: I always use 198mm x 129mm (approximately 5" x 8") because this matches UK printers’ most common sizes and looks professional.
3. Format Your Book
   Use the left sidebar to apply styles:
   • Click on chapter titles to assign heading styles.
   • Insert drop caps, block quotes, images, or footnotes via the Format menu.
   • Set paragraph spacing and indentation under Style options.
4. Preview Your Book
   Vellum provides a live preview pane, including how the book looks on Kindle devices.
5. Export Files
   Go to File > Export and select the desired formats: EPUB for Apple Books or Kobo, MOBI/AZW3 for Kindle, and print-ready PDF for KDP or IngramSpark.

Atticus Overview

Atticus is a cloud-based, cross-platform formatting and writing tool that targets authors seeking an all-in-one solution combining writing and formatting. It runs on Windows via a browser.

How to Use Atticus (Cross-Platform)

1. Create a New Project
   Log in at Atticus, click New Project, and name your book.
2. Import Your Manuscript
   Paste your manuscript directly or import a DOCX file via File > Import.
3. Set Your Book Dimensions
   Under Settings > Print Options, select your trim size (common UK sizes are pre-loaded). Modify margins and gutter as needed to match POD requirements.
4. Apply Styles
   Use the Styles panel to apply heading levels, paragraph styles, drop caps, and spacing. Atticus supports custom CSS for advanced users.
5. Export Your Book
   Click Export and choose formats: EPUB, Kindle (MOBI/AZW3), or PDF. Download the files directly or save them to cloud storage.

Pricing and VAT

UK authors need to factor in pricing in pounds sterling, including VAT. Here’s what you should know:

• Print Books are zero-rated for VAT in the UK, meaning no VAT is charged on physical books.
• Ebooks and digital publications attract 20% VAT in the UK, which affects pricing strategies.
• Retail platforms like Amazon automatically handle VAT, but you should be aware of net pricing for accounting purposes.

If you’re VAT-registered as a business, proper VAT treatment of book sales is essential to avoid complications.

ISBN and Metadata

ISBNs in the UK are purchased through Nielsen Book Services:

Purchasing your own ISBNs is crucial if you want to be recognised as an independent publisher, maintain control over metadata, and be listed in UK book trade databases.

Note: Amazon KDP offers free ISBNs, but these list “Amazon” as the publisher, which can limit distribution to other retailers and reduce professional credibility.

Print Sizes Popular in the UK

UK readers generally prefer classic, manageable sizes:

• 5" x 8" (129mm x 198mm) — popular for fiction and memoirs.
• 6" x 9" (152mm x 229mm) — common for non-fiction and general trade books.
• A5 (148mm x 210mm) — often used for workbooks, manuals, or niche non-fiction.

Both Vellum and Atticus support custom trim sizes, but be sure to confirm the exact measurements with your POD provider (e.g., KDP UK or IngramSpark UK).

Distribution Channels

While Amazon KDP is the dominant platform, UK authors benefit from diversifying:

• Amazon KDP UK: Fast-effective.
• IngramSpark: Offers wide distribution across UK and European bookstores.
• Draft2Digital: Useful for aggregating to other platforms and libraries.
• Waterstones and other UK bookshops: Require specific metadata and professional ISBNs.

Ensure your formatting supports these channels’ requirements, particularly in terms of print-ready PDFs and metadata embedding.

Overpaying for Formatting Services

Before founding publishing.co.uk, I paid a freelancer to format my first book. The result? A file riddled with errors, requiring multiple rounds of corrections. Investing in a robust tool like Vellum or Atticus—and verifying the output—often saves time and money.

Ignoring Exact Trim Sizes and Bleed Settings

A recurring error is neglecting to set the precise trim size and bleed margins. For example, submitting a 5.1" x 8" file instead of 5" x 8" can cause POD printers to reject the file or crop content awkwardly.

Pro Tip: Always consult the latest KDP or IngramSpark UK print templates. Vellum provides preset sizes, but double-check under Book Settings. Atticus lets you customise margins and bleed; use those features diligently.

Using Unprofessional Fonts and Styles

Fonts such as Papyrus or Comic Sans might look quirky but damage professional credibility. Both Vellum and Atticus offer industry-standard fonts like Georgia.

My experience: Early on, I used a free font that looked great on screen but failed on print devices. Stick to fonts widely supported across devices and print.

Confusing File Formats

Uploading the wrong file format is a common trap:

• Use MOBI/AZW3 for Kindle devices.
• Use EPUB for Apple Books other ebook platforms.
• Use PDF for print.

Both Vellum and Atticus simplify this, but always verify your target retailer’s current requirements.

While Vellum and Atticus are powerful, they aren’t silver bullets. For UK authors, here’s what else to consider:

• publishing.co.uk: Our automated formatting and validation service ensures your files meet UK POD specs compliance. We integrate with outputs from both tools, saving you time and stress. This is vital because even the best software misses UK-specific details like barcode generation and VAT pricing validation.
• Nielsen ISBN Agency: Essential for obtaining legitimate UK ISBNs and metadata management.
• LoveReading.co.uk: The UK's largest book review platform, offering invaluable reader insights and marketing opportunities. As co-owner, I can attest to its value for UK authors navigating the market.
• Amazon KDP Documentation: Always consult Amazon’s official resources for the latest file specifications: Amazon KDP Help.
• UK Society of Authors: For legal advice, rights management, and publishing best practices.

Alternative Approaches

Some UK authors explore other tools or workflows:

• Scrivener + Calibre: Scrivener for writing and initial formatting, Calibre for converting EPUBs and MOBIs. This approach requires more technical know-how and often more manual tweaking.
• Adobe InDesign: Professional-level layout software, but with a steep learning curve and higher costs.
• Reedsy Book Editor: A free, online editor with decent formatting capabilities but limited print PDF customisation.

*Publishing.co.uk integrates with file outputs from both tools to ensure flawless UK POD and KDP submission.

Additional Notes:

• Vellum’s one-time cost means no recurring fees but requires a Mac.
• Atticus’s subscription model offers ongoing updates and multiplatform access but is an annual expense.
• ISBN costs are non-negotiable and often overlooked by new authors.
• Professional cover design is a significant but essential investment.

Quick verdict

Use this if:

• You're publishing your first 1-3 books and want a fast workflow
• You don't want to learn complex software
• Cross-platform compatibility matters

Skip it if:

• You're publishing 10+ books and need granular control
• Your books have complex layouts (cookbooks, picture books)
• You already have a workflow that works

Best alternative: depends on your priority — speed (paid tool), price (free Calibre), or polish (paid service).

Frequently asked questions

Is Vellum free?

No. Vellum is a one-time paid purchase (around $199-$249) for macOS - there is no free tier and no subscription. Amazon's Kindle Create is the genuinely free alternative, though it is Amazon-only with far less typographic control. See our Kindle Create vs Vellum comparison for the free-vs-paid breakdown.

What's the cheapest viable option for serious self-publishing?

Calibre (free) for conversion, Atticus ($147 one-off, cross-platform) for layout, Canva Pro (£11.99/month) for cover. Total: under £200 for full workflow.

Should I learn the tool myself or pay someone to format for me?

If you'll publish 3+ books and enjoy software, learn the tool — it'll save thousands long-term. If this is a one-off launch, paying a formatter (£100-£300) is faster and avoids the 20-30 hour learning curve.

Does the tool affect KDP acceptance?

Indirectly. Tools that produce cleaner output (Vellum, Atticus) reduce KDP rejection rates. Calibre conversions and DIY Word formatting cause about 40% of formatting rejections in our queue.

Can I switch tools mid-project?

Most tools let you export to DOCX. You lose tool-specific features (snapshots, dynamic captions) but the manuscript transfers. Re-formatting in the new tool typically takes 2-4 hours.

Closing Thoughts

Choosing between Vellum and Atticus comes down to your platform and how deeply you want to engage with the formatting process. Vellum offers exceptional polish for Mac users, while Atticus provides cross-platform flexibility and cloud convenience.

From my experience, the key is not just the tool but what you do after formatting—validating UK-specific print specs, investing in proper ISBNs, and preparing your files for Amazon and wider UK and European distribution.

If you want to avoid the headaches I endured—hiring poor freelancers, battling formatting rejections, and wasting days on technical details—consider using publishing.co.uk as your final step. We’re built by authors, for authors, to take the pain out of UK book formatting.

Published on publishing.co.uk | © 2026 Robert Prime

About this guide

Written by Robert Prime for publishing.co.uk. Last reviewed May 2026. Specs and pricing change — verify current figures with the linked sources before relying on them.

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