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Book trim sizes explained (in millimetres, not letter names)
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Book trim sizes explained (in millimetres, not letter names)

Trim size is the width and height of a book page after it is cut. See the standard sizes in millimetres, which one fits your genre, and why letter names like A5 are not enough.

Harmony Publishing Editorial Team••7 min read
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What is an imprint? (and what is a DOI and a barcode?)
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What is an imprint? (and what is a DOI and a barcode?)

An imprint is the name a book is published under, a DOI is a permanent digital link, and a barcode is your ISBN in scannable form. Here is what each one does and which you need.

Harmony Publishing Editorial Team••8 min read
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Worse vs Worst: What's the Difference? (With Examples, 2026)
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Worse vs Worst: What's the Difference? (With Examples, 2026)

Worse compares two things; worst names the bottom of the set. Use the count test, spot the doubled forms, and get the two-item case right.

Harmony Publishing Editorial Team••4 min read
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Plan and price your book inside ChatGPT with the Harmony Publishing Assistant
ResourcesSelf-Publishing Packages

Plan and price your book inside ChatGPT with the Harmony Publishing Assistant

Compare self-publishing packages, get a package suggestion and estimate printing inside ChatGPT with the free Harmony Publishing Assistant. Nothing is sent until you confirm.

Harmony Publishing Editorial Team••6 min read
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What is a proof copy? (and why you should always read one)
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What is a proof copy? (and why you should always read one)

A proof copy is a printed sample of your book made before the full run. Learn what it is for, what to check and how it differs from an ARC and from proofreading.

Harmony Publishing Editorial Team••6 min read
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What is a first printing? (and how to tell whether your copy is one)
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What is a first printing? (and how to tell whether your copy is one)

A first printing is the first batch of finished copies of a book. Here is how it differs from a first edition and how to read the number line on the copyright page.

Harmony Publishing Editorial Team••7 min read
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How to Number Pages in a Book (Front Matter, Roman Numerals and Word)
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How to Number Pages in a Book (Front Matter, Roman Numerals and Word)

Where page 1 starts, how front matter is numbered, which pages show no number, and step-by-step page numbering in Word and Google Docs for a print book.

Harmony Publishing Editorial Team••6 min read
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What Is a Colophon, Front Matter and Back Matter?
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What Is a Colophon, Front Matter and Back Matter?

Front matter comes before the story, back matter after it, and a colophon records how the book was made. Here is the order and what each page is for.

Harmony Publishing Editorial Team••6 min read
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What is the difference between ISBN-10 and ISBN-13?
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What is the difference between ISBN-10 and ISBN-13?

ISBN-10 and ISBN-13 are one identifier in two lengths. Here is why the change happened in 2007, how conversion works and which length a new book carries.

Harmony Publishing Editorial Team••6 min read
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How to Write Acknowledgements for a Book (with an Example)
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How to Write Acknowledgements for a Book (with an Example)

Who to thank, where the acknowledgements page goes, how long it should be, a short example and the mistakes to avoid before your book goes to print.

Harmony Publishing Editorial Team••5 min read
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