InMobi DSP Creative Specifications and Guidelines

On Ad exchanges, InMobi DSP supports all popular mobile in-app ad formats. You can buy the following ad formats through InMobi DSP on ad exchange inventories:

Display ads

Display ads are static or animated images with standard dimensions. InMobi DSP supports the following sizes: Small banners, Medium banners, Interstitials, and Native Display. 

Small banners

Small banners are small-sized rectangular ads placed at the top, between paragraphs, and at the bottom of an article or a page. They are nonintrusive, cost-effective, frequent, contextual, and efficient formats that can reach a wider audience with minimal loading time and precise measurement.

The specifications of small banners are: 

• Dimensions: 640 x 100 pixels
• Media format: .jpg or .gif
• Maximum file size: 500 KB

Medium rectangle banners

Medium banners are rectangular ads of medium size. These ads can be placed between the content, loading page, reward pages, etc. They are nonintrusive, cost-effective, frequent, contextual, and efficient formats that can reach a wider audience with minimal loading time and precise measurement.  

The specifications of small banners are: 

• Dimensions: 600 x 500 pixels
• Media format: .jpg or .gif
• Maximum file size: 500 KB

Interstitials

Interstitials are rectangular ads that cover the screen on which they are displayed. These are high-impact ads.  The specifications of interstitials are: 

• Dimensions: 640 x 960, 960 x 640, 640 x 1136, and 1136 x 640 pixels
• Media format: .jpg or .gif
• Maximum file size: 500 KB

Native ads

Native ads blend in with the content on which they appear, providing a more seamless and less intrusive user experience. These ads mimic the look, feel, and function of the media format in which they are seen, such as articles, videos, or other media. These ads offer higher engagement rates, improved CTRs, stronger brand affinity, reduced ad fatigue, and better ad rendering, along with contextual and personalized targeting.

There are three types of native: Rich display, Rich video, and Icons.

Rich display ads

These are medium rectangle, fullscreen portrait, and wide rectangle ads. You can provide the ad creatives for the rich display ads based on the following specifications:

• Primary asset type (Mandatory): Image (1200 x 628 pixels)
• Secondary Asset (Mandatory): Icon (300 x 300)
• Text character limits:
  • Title: 20
  • CTA: 20
  • Sponsored By text: 20
  • Description: 140 characters

Rich video ads

These are medium rectangle, full-screen portrait, and wide rectangle video ads. You can provide the ad creatives for the rich video ads based on the following specifications:

• Primary asset type (Mandatory): Video
  • Full-screen landscape:
    • Aspect ratio: 4:3 to 16:9
    • Video resolution: 1080p or 720p
  • Full-screen portrait:
    • Aspect ratio: 9:16 to 3:4
    • Video resolution: 1080p, 720p
• Secondary asset (mandatory): Image
  • Wide rectangle: 1200 x 628 pixels
  • Square: 300 x 300 pixels
• Text character limits:
  • Title: 20
  • CTA: 20
  • Sponsored By text: 20
  • Description: 140

Icon ads

Icon ads in mobile apps are small, square-shaped, visually appealing ads typically displayed as icons within the app interface. These often appear in menus, navigation bars, or as part of a feed. You can provide the ad creatives for the icon ads based on the following specifications:

• Primary asset type (Mandatory): Icon image (300 x 300 pixels)

• Text character limits:
  • Title: 20
  • CTA: 20
  • Sponsored By text: 20
  • Description: 140 characters

Video with end cards

Video ads with end cards are short video ads displayed over the content or a page and followed by a static or animated display CTA card. The specifications of video ads are:

• Dimensions: 1920 x 1080 (16:9) and 1080 x 1920 (9:16)
• Media format: .mp4 or .mov
• Maximum file size: 100 MB
• Recommended range: <20 seconds

Playable ads

Playable ads are interactive micro-game formats in which users can interact and play game previews. After the game ends, users can click the CTA to install the app. These games are meant to engage users and motivate them to install the app for the complete experience. These ads are best suited for gaming advertisers but can also be incorporated into other verticals. The specifications of playable ads are:

• Dimensions: Portrait and landscape full-screen
• Recommended: Responsive
• Media format: HTML5 and JS tags
• Maximum file size: 5 MB

Important components of an ad unit

The important components of an ad unit are as follows:

• App icon or brand logo: Ensure clear visibility of your brand.
• Product showcase: Highlight key features or products.
• Primary tagline: Deliver a concise and compelling message.
• Secondary messaging: Provide additional information supporting the primary message.
• Call to Action (CTA): Make the CTA clear and prominent to drive user action.
• Background: Use a background that complements the overall design without distracting from the main content.
• Sub-headline: Offer additional supporting information.

Creative best practices

Adhere to the following creative best practices to ensure the DSP campaign leverages high-quality ad creatives that drive user engagement and deliver effective results.

Content must have the highest priority

The ad content is the most critical element of an ad campaign, as it directly engages the audience, conveys the brand message, and drives user actions. Make sure you:

• Keep copy short and concise, suitable for mobile consumption.
• Use images that are relevant to the content and context of the ad to enhance engagement.
• Ensure branding is clear and persistent throughout the creative.
• Use animation and bright colors to draw user attention and enhance recall if the creative format allows.
• Make icons and buttons distinct, large enough to be readable, and easy to tap.
• Include trust builders such as App or Play store ratings, review numbers, and logos.

Clear call-to-action

A clear call to action (CTA) directs users to what to do next, driving conversions and ensuring the ad achieves its intended goal.

• Ensure the CTA is prominent, with contrasting colors and enough white space to stand out.
• Use strong, action-oriented language in the CTA (For example, Order Now, Install Now).
• Make the CTA button similar to Play or App Store controls to increase familiarity and ease of use.

Effective video strategy

Optimum video length and effective content benefit a video campaign by maximizing viewer engagement and completion rates, ensuring the message is effectively delivered within the audience's attention span.

• Videos of 7-15 seconds typically achieve a 90% completion rate.
• Hook users within the first 2-3 seconds to maintain engagement.
• Focus on one main objective to guide creative execution.
• Use clear and concise messaging to prompt quick actions.

Interactive zones

• Place the most interactive elements or CTA in areas of the screen that are within reach of the thumb.

Format performance

• The 320x50 slot size is the best performer, offering cost efficiency and scalability.
• Static interstitials (320x480, 480x320, 320x568, 568x320) and medium rectangles (300x250) drive strong clicks and are effective for re-engagement efforts.
• Videos with end cards drive high clicks and are excellent for re-engagement.
• Users prefer vertical videos, as 94% of users hold their phones vertically. Horizontal videos disrupt user experience.

InMobi content guidelines

Refer to InMobi content guidelines to learn about what type of content you can run through ads.