N-Gram Finder breaks your search terms into single words and short phrases (n-grams) and shows how each performs across all of them. A word like "free" might look harmless in one search term, but across hundreds it can add up to a lot of wasted spend. N-Gram Finder finds those words so you can add them as negatives.
It works on Google Ads and Microsoft Ads. Open the ad account, then click N-Gram Finder under Toolkit in the left-hand menu.
Choose what to look at
Campaign type: at the top right, choose Search Campaigns, Shopping Campaigns or Performance Max (Google Ads only). A type is greyed out if none of its campaigns have spent.
Campaigns: click the campaigns button (for example All Campaigns). Brand campaigns are left out the first time, so they don't skew the results.
Date range: Last 30, 90, 180 or 365 Days.
Read the table
Each row is an n-gram. The main columns are:
Cost, Conv. and CPA (or Conv. Val. and ROAS in ROAS mode), and vs Avg.: how it compares with the average
nScore: how strongly Opteo suggests adding it as a negative, out of 100. It shows n/a when there isn't enough to go on.
Cost Savings and Conv. Loss: what you'd likely save, and the conversions you'd likely lose, by blocking it
Blocked Keywords and Blocked Search Terms: what blocking it would affect. Click a count to see the list.
With Google Analytics connected, Sessions, Engaged, Eng. Rate and Bounce Rate show how visitors behaved after the click. Without it, click Connect Analytics.
Some n-grams are highlighted. Hover over one to see why, for example that it does much worse than average across ad accounts in your industry.
Other tools on the page
Columns (for example 18 Columns): choose which columns you see.
Search n-grams and Filters: narrow the table. See Filter N-Gram Finder.
Select with AI: describe which n-grams to tick.
Open in Agent: send the table you can see, after any filters and search, to Agent.
Export CSV: download the table.
Negative Lists and Change History: see your negative lists, and every negative you've added with N-Gram Finder.
To add negatives, see Add negatives with N-Gram Finder.