Question 1

What is a book subtitle?

Accepted Answer

A book subtitle is the line after the title that says what the book is about or what the reader gets.

KDP calls it a subordinate title with more information about the book's content.

Question 2

How long should a book subtitle be?

Accepted Answer

Most nonfiction bestseller subtitles run 5 to 10 words; in business and self-help, the middle half is 6 to 10 words.

On KDP, the title and subtitle together must be under 200 characters.

Question 3

Does every book need a subtitle?

Accepted Answer

No, but most nonfiction bestsellers have one: 86% of business, 71% of self-help and 57% of memoir bestsellers in the set carry a subtitle.

Question 4

Can a subtitle include keywords?

Accepted Answer

A subtitle can use the words readers search for, as long as it follows KDP's title rules: no repeated generic words, no sales rank words and no promotion words.

Question 5

Is the book subtitle generator free?

Accepted Answer

Yes, the book subtitle generator is free, with no sign-up.

Asking your own AI is free, and Generate here has a daily limit.

Question 6

What other free tools can I use for my book?

Accepted Answer

The book title generator finds the title first, and the book description generator works from the same pitch.

See all my free tools.

Question 7

Who made the book subtitle generator?

Accepted Answer

I did. I'm Navid Moazzez, and I made the book subtitle generator as one of my free tools on navid.me.

More about me.

Free Book Subtitle Generator (+ Guide)