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Proofreading vs. copyediting vs. line editing: what's the difference?

These three terms get used interchangeably, but they describe different depths of edit -- and knowing which one your document needs saves you money and avoids a mismatch between what you expected and what you got back.

Proofreading

The lightest pass: grammar, spelling, punctuation, and formatting consistency. It assumes the writing itself is already in good shape and just needs the surface-level errors caught. This is the right choice for a document you've already had reviewed by a supervisor or co-author and just need polished before submission.

Copyediting

A step deeper -- copyediting also looks at sentence clarity, word choice, and consistency of terminology and style across the whole document, on top of the proofreading pass. This is the most common request for journal manuscripts and dissertation chapters: you want the grammar fixed and the prose to read clearly to someone outside your immediate research group.

Line editing

The deepest of the three -- line editing works at the paragraph and argument level: flagging unclear transitions, repetitive points, or claims that aren't well supported by what precedes them. It doesn't rewrite your argument, but it flags where the argument doesn't land the way you intended. This is worth it for a thesis introduction or discussion section you've rewritten several times and have lost perspective on.

Which one do you need?

If in doubt, send the document and describe where you are in the process -- start a project and I'll tell you honestly which level of edit actually fits, rather than upselling the deepest one by default.