YouTube Shorts as a lower-funnel channel: what the data actually shows
YouTube Shorts inventory has matured enough to evaluate seriously as a performance channel. The CPMs are lower than long-form, the audience size is substantial, and there is now enough campaign data to understand when it earns its place in a media plan.
YouTube Shorts passed two billion logged-in monthly users in late 2024. For most paid media teams, it has remained a brand awareness play: cheap reach, low CPMs, limited direct response utility. That categorisation is worth revisiting.
Over the last year I have run structured tests across six ecommerce accounts, deliberately isolating Shorts inventory to understand what it actually contributes at the bottom of the funnel rather than relying on platform-reported performance blended with long-form YouTube. The findings are more nuanced than either the "Shorts is just TikTok" or the "Shorts converts like search" narratives suggest.
The inventory reality
Shorts inventory within a Video Action or Demand Gen campaign is served automatically unless you opt out. Most accounts have been running it without knowing it. The first step for any proper evaluation is to segment the reporting by format using the creative type dimension.
Once you can see Shorts versus in-stream performance separately, the divergence in behaviour becomes visible. CPMs on Shorts are typically forty to sixty percent lower than in-stream for the same audience. View rates are incomparable as metrics because the definitions differ. The number that matters is cost per incremental conversion, which requires a test rather than a reporting slice.
Before drawing any conclusions about Shorts performance, confirm you can segment your Video Action or Demand Gen reporting by creative type. Blended numbers include Shorts and in-stream together, and the two formats behave differently enough that a blended figure is not actionable for either.
What converts on Shorts
Shorts ads behave more like TikTok than like YouTube long-form. They require native creative, meaning vertical orientation, no-sound-required structure in the first two seconds and a CTA that works within six seconds of viewer attention. Long-form repurposes perform measurably worse.
In the accounts where Shorts delivered meaningful lower-funnel volume, three creative properties were consistent:
- The problem or product appeared in the first one to two seconds without setup
- The audio was optional: the visual told the story independently
- The CTA was direct and benefit-led, not brand-led
These are the same principles that govern TikTok performance creative. Practitioners with Meta and TikTok creative experience will find the translation straightforward. Teams accustomed to the longer storytelling arcs of six-second bumpers or fifteen-second skippable ads will need to adjust.
| Creative type | Avg. CPM | Click-through rate | Conversion rate index | Notes |
|---|---|---|---|---|
| Shorts (native vertical) | £3.20 | 1.8% | 0.9 | Near in-stream conversion rate at lower CPM |
| Shorts (repurposed horizontal) | £2.80 | 0.9% | 0.5 | CPM saving offset by weaker performance |
| In-stream 15s (skippable) | £6.10 | 2.1% | 1.0 (baseline) | Established lower-funnel benchmark |
| In-stream 30s (non-skippable) | £8.40 | n/a | 0.7 | Awareness format; lower DR efficiency |
The measurement question
Platform-reported ROAS for Shorts will be inflated by view-through attribution, the same problem that affects all upper-funnel YouTube measurement. The defensible evaluation method is either a campaign-level lift test via Google Brand Lift or, for larger budgets, a geo holdout test segmenting Shorts-on versus Shorts-off regions.
The platforms will not lead you toward these tests because they complicate the attribution story. Run them anyway. The accounts where I have run clean Shorts incrementality tests have found a real, if modest, direct response contribution at CPAs competitive with in-stream inventory, provided the creative is genuinely native.
Every Shorts test we ran with repurposed creative underperformed. Every test with native vertical creative broke even or better. The inventory is not the variable. The creative is.
Sara Lindqvist, paid social audit notes Q1 2026
When to include Shorts in your plan
Include Shorts as a dedicated line if: you have the creative capability to produce native vertical content, your DTC products lend themselves to visual demonstration, and you have the conversion volume to run a statistically valid lift test. Exclude or suppress it if you are running repurposed creative and cannot resource new production, or if your product category requires considered purchase research that a six-second Shorts ad cannot initiate.
The floor condition is creative. If the team is not ready to produce vertical-native assets, opt Shorts out of your Video Action campaigns until they are. Running bad Shorts creative just because the inventory is cheap is spending money on waste and calling it efficiency.