New sellers often treat Auto and Manual campaigns as a choice — pick one and run with it. In practice, they’re better understood as two stages of the same discovery-to-scale process, not competing strategies.
What each one actually does
Auto campaigns hand targeting decisions to Amazon: the algorithm decides which search terms and products your ad shows against, based on your listing content. You don’t pick keywords — Amazon infers them.
Manual campaigns put you in control: you choose specific keywords or ASINs to target, and set bids for each one individually.
Why Auto comes first, not instead
Auto campaigns are the fastest way to find out what customers actually search for to find a product like yours — often surfacing search terms a manual keyword brainstorm would never have guessed. Running Auto isn’t a fallback for sellers who haven’t set up Manual yet; it’s active keyword research, paid for by clicks that are also generating sales.
Why Manual is where control lives
Once Auto data shows which search terms convert, Manual campaigns are where that insight gets acted on: moving a proven term into its own ad group with a bid set specifically for it, rather than sharing a bid with dozens of other auto-discovered terms of wildly different value.
This is also where negative keywords do their most useful work — excluding the search terms Auto surfaced that spent money without converting, so that budget stops leaking to matches that already proved themselves irrelevant.
A practical structure
- Launch or ongoing discovery: Auto campaign running continuously, feeding search term data
- Weekly or automated review: search terms with orders get promoted into Manual (Phrase, then Exact)
- Housekeeping: non-converting search terms get added as negatives in Auto, so the same wasted click doesn’t repeat
Run well, Auto and Manual aren’t two separate strategies competing for budget — they’re a continuous loop where Auto keeps finding new opportunities and Manual keeps capturing the ones that are already proven.