If you are seeking a publisher or planning to self publish you will need a synopsis. Writers freak out at the word “synopsis” when it just means “summary.” Many editors and agents require a synopsis (that reveals the ending) to help them judge a submission. Plus, as an author, you will have to summarize your work when people ask, “What is your story about?”
You supply me with a draft of your current synopsis (if you have one) or a list of plot points and/or a chapter summary of your entire manuscript and I can help you develop and edit a new synopsis.
Do not confuse the term “synopsis” with “chapter summary.” A synopsis is written in essay/paragraph style and is not an individual summary of each chapter. I can edit a chapter summary instead of a synopsis if you prefer.
I believe a full synopsis should be no more than 1% of the final word count of the manuscript. For example, if you have a 70k word manuscript, you should aim to have a complete synopsis (summary) in 700 words—give or take a little, but not much. The synopsis should be coherent and compelling.
“Can’t you just write the synopsis for me? I’ll pay you!”
If I have to draft the synopsis from scratch, that requires my reading the entire manuscript and charge a substantial reading fee and the manuscript has to be in its final, edited draft. Therefore, I rather do synopsis development than drafting because it is more time efficient for me and cost effective for you.
Blurbs are different than a synopsis because they are geared towards promotion. Yes. Promotion. If you are at the stage where you are seeking professional editorial help, you have to think about what will happen after publication. Your blurb may double for your back cover text. I will help you summarize your work in approximately 25/50/75/150 words because you will need blurbs in various lengths depending on their planned use.