Initial Load and SubLoad Calculator
Calculate the max load sizes for HTML5 and static ads.
Following guidelines of the IAB.
What are the initial load and subload?
The Interactive Advertising Bureau (IAB) has provided guidelines regarding initial load and subload sizes for ads to ensure optimal performance and user experience. Here's what that means:Initial load— This is the amount of data (in KB) required by all assets and files necessary for completing first visual display of the ad and requested before the DOMContentLoaded event has been dispatched by the window object.Subload— This is the additional data that can be loaded after the initial load, typically after user interaction or after the ad creative has become visible.
Step-by-Step Calculation Guide
The IAB provides specific recommendations for different types of ads based on their dimensions, which will fall in a "pixel group". Here's how you can calculate the pixel group based on a given width and height.- Determine the ad dimensions: You need to know the width and height of the ad in pixels. For example 300x250.
- Multiply its product by 4 in order to get the pixel group. For example, 300 x 250 x 4.
- Determine thresholds: see the table below for the maximum initial load and subload for each pixel group.
HTML5 Zip Ads
| Pixel Group | Initial load | Subload |
|---|---|---|
| <120,000 | 50 KB | 100 KB |
| 120,000 - 180,000 | 75 KB | 150 KB |
| 180,000 - 300,000 | 100 KB | 200 KB |
| 300,000 - 500,000 | 150 KB | 300 KB |
| 500,000 - 700,000 | 200 KB | 400 KB |
| 700,000 - 900,000 | 250 KB | 500 KB |
| 900,000 - 1,000,000 | 300 KB | 600 KB |
| 1,000,000+ | 350 KB | 700 KB |
Static Ads (PNG/JPG)
| Pixel Group | Max file size |
|---|---|
| <120,000 | 50 KB |
| 120,000 - 180,000 | 75 KB |
| 180,000 - 300,000 | 100 KB |
| 300,000 - 500,000 | 150 KB |
| 500,000 - 700,000 | 200 KB |
| 700,000 - 900,000 | 250 KB |
| 900,000 - 1,000,000 | 300 KB |
| 1,000,000+ | 350 KB |
Ad Validation Scanners
AdValify.io has scanners to see if ads comply with your ad specification. See this HTML5 Ad Validator for Zip creatives, and this Banner Ad Tester for static images. Try it yourself - it's free.Fully Automated Tests
AdValify also offerers automatic testing using the API. Automate and scale your complete QA workflow. Save tons of time. For more information, see the API Documentation.Ad Serving
Are you looking for an ad server to serve your HTML5 creatives or static display ads? Try AdGlare Ad Server.
Giovanni Sollazzo
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Founder & Chairman, AIDEM Technologies
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Dylan Coetzee
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Digital Marketing Director, OmniaMed Communications
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