Half Page Ad
300 x 600 px sRGB 1:2 portrait
A 300 by 600 px Half Page. One of the most attention-grabbing standard display sizes, and the tallest format the IAB blesses for sidebar placement.
about the height of a sidebar block
About this size
The Half Page is the closest the standard display-ad menu comes to giving designers room to actually compose. Image, headline, body line, and CTA can all coexist without crowding. The format reads more like a small poster than a banner, and premium publisher placements treat it like one.
The height is the asset. Designs that flow top to bottom in three deliberate zones (hero imagery near the top, the message in the middle, the call to action at the bottom) consistently beat designs that try to fill the whole rectangle with one busy composition. Tall ads reward visual hierarchy and punish density.
- Display ads
- Tall promos
- Rich media layouts
Pro tips
- 1 Three zones, top to bottom: image, message, CTA. The vertical flow matches how the reader's eye travels down the format.
- 2 Anchor the CTA at the bottom. Tall ads train the reader to expect the action at the end of the scan; CTAs at the top get scrolled past.
- 3 Use the height for emotional hero imagery. Half Page is one of the few standard ad formats that holds a full portrait without cropping or distortion.
- 4 Animated versions can sequence three or four messages over their loop. Keep each frame readable on its own, because most networks stop the animation on the final frame.
Common mistakes
- Stretching a 300 by 250 design vertically to fill the format. The proportions break and the layout reads as a slapped-together upsell.
- Placing the CTA at the top. Readers expect the action at the bottom of a tall ad; putting it up top means most readers never see it.
Frequently asked
Where do half page ads appear?
Sidebar placements on desktop publisher sites. They are less common on mobile because the vertical format overwhelms small screens.
How does Half Page compare to Medium Rectangle?
Twice the height (300 by 600 vs 300 by 250), roughly twice the attention. Half Page tends to command higher CPMs and supports more layered creative; Medium Rectangle has wider inventory and serves more often.
Same series — IAB Standard Display Ads
Rendered at relative scale; tap any size to open it.
Compare with
Sizes often weighed alongside Half Page Ad. Open a side-by-side breakdown.
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