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What Are the Meaning of Proofreading Marks?

Posted in: Understanding Publishing on June 6, 2018 Leave your thoughts 💬

meaning of proofreading marks

Having your work come back from an editor covered in red pen is daunting to begin with. Receiving a manuscript that's covered in proofreading marks that might as well be hieroglyphics can be even more intimidating.

But before you reach for your cipher wheel, remember that the purpose of proofreading marks isn’t to confuse you. It’s to provide a detailed roadmap to a professional and polished final manuscript. While independent authors are not likely to spring for large print runs which would be ruined by more than a couple of typoe — proofreading still remains an essential step for most serious self-publishers.

These days, it’s unlikely for the proofreading process to take place via pen-and-paper, meaning that the use of proofreading marks is also becoming increasingly rare. Most proofreaders used tools such a “tracked changes” to flag issues — and many indie authors choose to forgo professional proofers for software such as Grammarly or the simple red, dotted line that signifies a typo in processors such as Microsoft Word or Google Docs.

That being said, screen fatigue is a real thing and there’s something about a hard-copy document that seems to draw the eye to errors more than a digital one. So if you’re working with a proofreader and want to ensure the collaboration fulfills its top potential, it’s worth getting to know the meaning of the more common proofreading marks.

So, without further ado…

What is Proofreading? And Can You Do It Yourself?
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What are proofreading marks?

Proofreading marks are used to highlight spelling, vocabulary, grammatical, and punctuation errors, along with formatting and layout issues.

When proofreaders are editing a hard-copy manuscript, they will leave corrections on both sides of the margins: on the left-hand margins for corrections in the first half of the sentence, and on the right-hand side for corrections in the latter half of the sentence. A corresponding mark will also be included in-line to indicate where the issue is.

Alright, now let’s take a look at these formidable editing symbols.

Proofreading marks chart

The following proofreading symbols are taken from The Chicago Manual of Style 17th edition. While in-house style guides may vary from publisher to publisher, these symbols are standard across the industry.

Let’s start with operational marks, which cover everything from spelling to sentence structure to improper spacing.

Operational Proofreading Marks: Delete, Close up (delete space), Delete and close up, Insert space, Space evenly, Move left, Move right, Begin new paragraph, Let it stand, Transpose, Spell in full

Whereas most proofreading terms are fairly straightforward (I think we can all surmise what “insert period” means), some of the operational instructions may be a little less familiar, so we’ll quickly cover the less common ones:

  • The “delete” symbol on its own will refer to a word, while “delete and close up” will refer to a letter in a word.
  • The ”let it stand” symbol would be used when more than one round of proofreading was done and it indicates that a correction or alteration should be ignored.
  • The “transpose” symbol indicates the order of words needs be to changed (spot the transpose problem).

Next up are the punctuations marks, which — you guessed it — indicate that punctuation needs to be added.

Punctuation Proofreading MarksL Insert period, Insert semicolon, Insert colon, Insert comma, Insert apostrophe or single quotation mark, Insert double quotation marks, Insert parentheses, Insert en dash, Insert em dash, Insert hyphen

Then there are typography marks, which denote formatting corrections.

Typography Proofreading Marks: Set in capitals, Set in lowercase, Set in italic type, Set in boldface type, Set in roman type, Insert here or superscript, Insert here or subscript

Lastly, these are common abbreviations used by proofreaders to indicate issues related to the copy itself.

Proofreading abbreviations: Faulty diction, Awkward construction, Too wordy, Verb tense problem, Wrong wording, Run-on sentence, Unnecessary repetition

The importance of proofreading

Ensuring that your book is polished and error-free is just as important to the reader experience as the quality of the writing. Your book can’t effectively communicate if the reader is constantly paused by spelling mistakes, awkward sentence structures,       or      uneven       spacing.

meaning of proofreading marks

What Are the Meaning of Proofreading Marks?
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Looking to get your book proofread?

First, we recommend doing as much of the work yourself as possible. Here are a few resources that will help:

Ready to learn how to spot (and fix) the ten most common writing mistakes?

Enter your email below and select 'Editing - How to Self-Edit Like a Pro' in the drop-down menu of the next pop-up to sign up for our free, 10-day course.

Once you’ve done all the proofreading work you can, we encourage you to consider working with a professional. Proofreading is the final stage of the editing process and will ensure your book fully meets its potential for success.

The average costs of working with a professional proofreader on Reedsy are:

  • $350 for a 40k-word book
  • $520 for a 60k-word book
  • $700 for an 80k-word book

Head to our marketplace to request quotes from a variety of professional proofreaders for free.


Have you ever worked with a professional proofreader? Or do you prefer to go the DIY route? Leave any thoughts or questions in the comments below!

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