A template for the Seamless Skin format, that allows for the easy creation of a responsive skin creative for sites with an asymmetrical layout. Overlays in the side panels should be used to ensure your content is always clear and visible, avoiding the need to rely on safe-zones.
Guide to skins
- The difference between our Seamless Skin & Fluid Skin formats
- The respective templates (i.e. Seamless Image Skin, Seamless Sliding Skin, Fluid Skin Image, Fluid Skin Video, etc.) within our Seamless & Fluid Skin formats
- Tips and best practice for using overlays
Examples
Adventure Travel
Plantagen
Note - Adnami preview page does not currently support asymmetrical layouts, so its best to use the Adnami chrome extension to preview the format in-situ on an asymmetrical layout publisher.
Recommended default creative dimensions
Skin Background
- Image: 2560x1440px (JPG)
- Video: 1920x1080px (MP4)
Side Overlays:
- Max size of 800x1440px (PNG with transparent background)
Top Banner:
- JPG or PNG with transparent background. Produce assets to the billboard heights below.
Top banner sizes vary across publishers and between countries, so please read carefully to ensure your assets are produced correctly.
For HTML5 Top Banners, the creative width should be responsive (width: 100%) up to a maximum width of 1280 pixels. The height will match the billboard height from the list below. If the width of your top banner is not responsive, there may be empty space visible between the top banner and side panels on some sites.
Billboard placement sizes by country:
- 🇦🇹 AT: 1000x250px
- 🇨🇭 CH: 1000x250px
- 🇩🇪 DE: 1000x250px
- 🇩🇰 DK: 930x180px
- 🇫🇮 FI: 1000x400px
- 🇫🇷 FR: 970x250px
- 🇳🇱 NL: 970x250px
- 🇳🇴 NO: 980x300px
- 🇵🇱 PL: 970x250px
- 🇸🇪 SE: 1000x240px
- 🇬🇧 UK: 970x250px
For Finnish placements on iltalehti.fi, export the top banner at 1280x400px while keeping a 1000x400px safe zone.
Format description and guidance
The background asset (image or video) spans the entire screen background. You can change the scaling mode to control the scaling behaviour.
- contain - The asset keeps its aspect ratio, but is resized to fit within the given dimension.
- cover - The image keeps its aspect ratio and fills the given dimension. The image will be clipped to fit.
- none - The image is not resized and appears at its original size.
When using the "cover" scaling mode, avoid placing any "key" elements (logos, messaging, CTA etc) near the edges of the background asset, as they may be cropped on smaller screens.
We recommend using the overlays to add static branding and messaging elements on top of the background. The overlays automatically scale and resize, so using them will enable responsive functionality for your skin. You can define what width & height (as a percentage of the total side-panel area) the overlays should occupy, as well as define minimum and maximum widths (in pixels) to constrain their scaling. On pages with asymmetrical layouts, the overlays will be scaled differently on each side, so it's important to check publisher specs to ensure your overlay assets are designed appropriately.
You can also choose how the overlays are positioned within the skin side-panels. By default they are centered, however you can modify the horizontal (X) and vertical (Y) position of the overlays using the preset options, or define your own custom position (measured from the top, you can use any valid css unit eg 250px, 50%, 20vh etc).
For best results, export the overlay PNG assets without any excess empty space - this allows the template to handle the overlay scaling and placement more effectively.
The Top Banner of the skin should be added as a static image, produced to the size defined by the publisher specs. It will be automatically repositioned to appear above the content element on the publisher page.
Max total file weight
3.5 MB
For best performance, all assets should be compressed and optimized to the lowest possible file weight. We recommend using tinypng.com to compress PNGs.
Click tags and tracking
The template supports one click URL & tracker.
Template Details
Automatically synced on 2026-02-11T14:27:19.509Z. This section documents the canvases, banner templates, and trafficking controls directly from the source configs.
Canvases: Seamless Skin
Banner templates: Asymmetric Seamless Image & Streaming Video Skin
Use the tables below to configure the linked banner templates. Each parameter definition is pulled straight from the template config, ensuring the spec always documents the latest functionality.
Asymmetric Seamless Image & Streaming Video Skin
An asymmetrical version of the seamless image skin template, for publishers with non-symmetrical layouts. · Version 1.1.1
General
| Parameter | Purpose | Default / Choices | Notes |
|---|---|---|---|
| 1.0 Click URL | Destination URL triggered when the user interacts with this element. Include https:// and any tracking parameters. | ||
| 1.1 Background (Image) | Upload the 1.1 background (image) asset (JPG, PNG, or WEBP). Follow safe-zone guidance and stay within the platform file-size limits. | ||
| 1.1 Background (Video) | Provide the 1.1 background (video) video in MP4 or WEBM format, encoded for autoplay and kept under the maximum weight. | ||
| 1.1 Max Stream Weight | Select the 1.1 max stream weight option from the list to control how the template behaves. | 2.5mb | choices: 3.5mb, 2.5mb, 1.5mb, 1.0mb | |
| 1.1.1 Background scaling mode | Select the 1.1.1 background scaling mode option from the list to control how the template behaves. | cover | choices: cover, contain, none | |
| 1.1.2 Background minimum width (advanced) | Define the 1.1.2 background minimum width (advanced) using responsive CSS units (px, %, vw, vh) so it scales across screens. | 0 | |
| 2.0.1 Left panel overlay | Upload the overlay asset (JPG, PNG, or WEBP). Overlays render with object-fit: contain, so they will not crop and do not require extra safe-zone padding. | ||
| 2.0.2 Right panel overlay | Upload the overlay asset (JPG, PNG, or WEBP). Overlays render with object-fit: contain, so they will not crop and do not require extra safe-zone padding. | ||
| 2.0.3 Top banner overlay | Upload the overlay asset (JPG, PNG, or WEBP). Overlays render with object-fit: contain, so they will not crop and do not require extra safe-zone padding. | ||
| 2.1.0 Side Overlay Hover Effect | Select the 2.1.0 side overlay hover effect option from the list to control how the template behaves. | scale | choices: disabled, glow, scale, glow & scale | |
| 2.1.1 Side Overlay Width | Define the 2.1.1 side overlay width using responsive CSS units (px, %, vw, vh) so it scales across screens. | 80% | |
| 2.1.2 Side Overlay Height | Define the 2.1.2 side overlay height using responsive CSS units (px, %, vw, vh) so it scales across screens. | 100% | |
| 2.1.3 Side Overlay Minimum Width | Define the 2.1.3 side overlay minimum width using responsive CSS units (px, %, vw, vh) so it scales across screens. | 120px | |
| 2.1.4 Side Overlay Maximum Width | Define the 2.1.4 side overlay maximum width using responsive CSS units (px, %, vw, vh) so it scales across screens. | 300px | |
| 2.2 Side Overlay X Position | Controls how the 2.2 side overlay x position aligns inside the frame. Pick the focal point that keeps the subject in view. | center | choices: center, inside, outside | |
| 2.2.1 Horizonal Offset (optional) | Sets the 2.2.1 horizonal offset (optional) value used in the creative. Supports plain text or CSS units where required. | ||
| 2.3 Side Overlay Y Position | Controls how the 2.3 side overlay y position aligns inside the frame. Pick the focal point that keeps the subject in view. | center | choices: top, center, bottom | |
| 2.3.1 Vertical Offset (optional) | Sets the 2.3.1 vertical offset (optional) value used in the creative. Supports plain text or CSS units where required. | ||
| 2.4 Auto-hide Side Overlays | Select the 2.4 auto-hide side overlays option from the list to control how the template behaves. | Disabled | choices: Enabled, Disabled |