Why can't I humanize my whole document at once?

Each plan has a per-request cap: the most you can submit in one go (300 on Free, 1,500 on Starter, up to 6,000 on Max). It keeps each rewrite fast and predictable.

If your text is over the cap, you can humanize the first N words, or (on Pro and Max) split the text automatically at paragraph boundaries and get one stitched result back. Your monthly allowance is separate: it's the total words you can humanize in a period.