Ad Fraud Statistics 2026: The Numbers Every UK Marketer Should Know

If you buy digital media, a meaningful share of your budget is reaching machines, not people. These are the numbers worth committing to memory in 2026 — each with its source and what it means for your spend.

How much of the internet is even human?

• 51% of all web traffic is now automated (Imperva, 2025 Bad Bot Report) — for the first time in a decade, non-human activity outweighs human.
• Bad bots make up 37% of internet traffic, up from 32% the year before (Imperva) — the malicious share is climbing, driven by generative AI.

What it costs advertisers

• Global ad-fraud losses are projected at $100.2bn in 2026 (Juniper Research) — up from around $63bn in 2025.
• Losses are forecast to hit $172bn by 2028 (Juniper Research) — the problem compounds year on year.
• Around 20.6% of programmatic ad traffic is invalid (Juniper Research) — roughly one in five impressions.
• The fraud-detection industry itself will top $4.8bn in 2026 (Juniper Research) — the market spends billions just to police the problem.

Where the waste hides

• Only ~36% of a programmatic dollar reaches a real consumer (ANA) — the rest disappears into the “cost waterfall”.
• Made-for-advertising sites once took 15% of programmatic spend and 21% of impressions (ANA, 2023) — controls cut this to ~6% before it began rising again.
• CTV invalid traffic hit 18% globally in Q1 2025, up from 12% a year earlier — and 24% in the UK (Pixalate).
• Bots account for 65% of all fraud in CTV (DoubleVerify) — 14 points higher than other channels.

What the numbers add up to

The pattern is consistent: reported reach and real, human reach are drifting further apart. Verifying delivery at the device level is the only way to know which half of your budget is working.

Treat this page as a living scorecard, not a one-off read. The individual figures shift each quarter, but the direction of travel is fixed: as AI makes bots cheaper to build and the supply chain harder to see into, the distance between what you’re billed for and what a human actually saw keeps widening. The marketers who stay ahead aren’t the ones who memorise every stat — they’re the ones who measure the gap in their own campaigns and act on it.