HTML5 Banner Requirements for Google Ads

Google Ads validates uploaded HTML5 creatives before they can serve. A banner that works when opened locally can still fail if the package structure, references, HTML markup, dimensions, or click behavior do not match the platform requirements.

Core package structure

The delivery is a ZIP containing the HTML entry file and supported local assets. Google’s uploaded display ad specifications require standard HTML structure and an ad-size meta tag in the document head. Code and assets should use relative references to files inside the ZIP, with limited exceptions for approved Google-hosted resources.

Example dimension declaration

<meta name="ad.size" content="width=300,height=250">

The declared size must match the visible creative and the uploaded placement. Every size should be packaged and named clearly.

Asset and code checks

• Use local images and scripts permitted by the specification.
• Remove unused source, temporary, and hidden files.
• Confirm every relative path after compression.
• Avoid unsupported external requests.
• Use explicit closing tags where the validator requires them.
• Make sure the ad remains within its dimensions.
• Test the click area and landing behavior.

Account eligibility

Uploaded HTML5 access can depend on Google Ads account eligibility and policy history. Creative production and account eligibility are separate issues: a technically correct ZIP cannot enable HTML5 upload for an account that does not have access.

Animation and user experience

Keep motion purposeful and lightweight. The logo, offer, and CTA should remain understandable even if a user sees only part of the sequence. Avoid rapid flashing, intrusive behavior, or animation that hides required legal information.

Recommended validation workflow

1. Open the uncompressed banner locally and inspect the console.
2. Test the exact ZIP in the relevant HTML5 validator.
3. Upload to a test creative or draft campaign when possible.
4. Confirm dimensions, click-through, replay, and asset loading.
5. Review the backup or final frame.
6. Repeat for every size rather than assuming the master proves all variants.

Common reasons for rejection

Typical problems include broken relative paths, unsupported files or code, an incorrect ad-size meta tag, excessive package content, invalid click handling, and assets that load from an unapproved external location.