How to validate HTML5 banners with Genecy MCP

In short: Ask your connected AI assistant to check an ad banner with Genecy. You get a clear pass/fail summary and a preview link you can open to see how the banner looks and to test its clicks before Google Ad Manager upload.

This guide is for anyone who works with display ads and wants a quick quality check without digging into technical settings. Your AI assistant talks to Genecy for you. You share the banner, get the results, then open the preview link to judge the creative yourself.

What this helps you do

Genecy looks at your banner file and tells you about common problems that often block a smooth upload to Google Ad Manager, such as:

  • missing or mismatched size;
  • click-through setup issues;
  • risky or incomplete packaging (for example a ZIP that is missing an image);
  • other HTML5 display issues Genecy already checks on the website.

Just as important: when the check can store a preview, Genecy also gives you a live preview page and a written report. The preview is the place to see the banner on screen and try the clicks — not only read a score.

A clean written result still does not mean Google Ad Manager will automatically approve the creative. Always open the preview and do a final check in your ad system before going live.

After a successful check, your AI assistant should share a preview link from Genecy. Open it in your browser.

  • See the banner — confirm layout, size, images, animation, and overall look.
  • Test the clicks — click the banner the way a viewer would. Genecy’s preview catches the click in a safe test page so you can confirm the click is wired up, without relying on a live campaign.
  • Share with teammates — send the same link to a designer or trafficker while it remains valid.

You will usually also get a separate report link with the full list of findings in plain language. Both the preview and the report are typically available for about 30 days.

Ask your assistant for the preview link if it only pasted a summary. That link is the main way to “see” the creative after a Genecy check in chat.

When to use it

  • A partner just sent a banner ZIP and you want a first check — and a clickable preview — before trafficking.
  • You updated a creative and want to confirm it still looks right and the clicks still work.
  • You are reviewing several sizes and want the same kind of feedback every time.
  • You already chat with ChatGPT, Claude, Grok Bot, or Cursor and prefer to stay there.

If you need to create a banner from a YouTube link or a video file on your website, use the generate guides instead: YouTube banners or hosted video banners.

Before you start

  1. Connect Genecy to your AI assistant once. Steps are in How to use Genecy MCP with ChatGPT, Claude, Grok, and other AI agents. Keys live under Settings → MCP keys.
  2. Have the banner ready — preferably the same ZIP you would upload (HTML plus images and other files inside). A single HTML file also works for simple creatives.
  3. Know the real file name and, if possible, the size the ad slot needs (for example 300×250).

How to check a banner in chat

  1. Attach or share the banner file in the chat.
  2. Ask your assistant to check it with Genecy for Google Ad Manager.
  3. Mention the file name and the expected width and height if you know them.
  4. Read the short summary your assistant returns.
  5. Open the preview link — look at the banner and click it to test the click-through.
  6. Open the report link if you want the full list of issues.
  7. Fix anything marked as an error, then ask for another check and a fresh preview before you upload.

You do not need to tell the assistant how Genecy’s connection works. Once Genecy is connected, a plain request is enough.

Example things you can say

  • “Please check this banner ZIP with Genecy before I upload it to Google Ad Manager. The file is called summer-sale-300x250.zip and it should be 300×250. Send me the preview link so I can click-test it.”
  • “Can Genecy review this HTML banner, tell me what is wrong in simple words, and give me the live preview?”
  • “Check this package with Genecy and share the preview and report links.”
  • “I fixed the click problem — please check the same file again and send a new preview.”

What you will see

After the check, your assistant should share:

  • whether the banner passed (no errors) or needs fixes;
  • a short summary of errors, warnings, and notes;
  • the file name Genecy used;
  • a preview link — open this to view the banner and test clicks;
  • a report link — open this for the detailed findings;
  • how long those links stay available (usually about 30 days).

Warnings alone do not fail the check. Errors do. If the file is empty or far too large, you may get a short failure message without preview or report links.

Good to know

  • The preview is a safe Genecy test page: clicks are confirmed there so you can verify the click setup without needing a live campaign.
  • A ZIP that includes images and scripts is better than HTML alone, because Genecy can see whether those files are present — and the preview can show the full package.
  • Use the real file name so reports and previews stay easy to recognize later.
  • Always do a final review in your ad system’s test creative before going live.
  • Very large packages may be refused — keep banners within normal Google Ad Manager HTML5 size limits.

Try it on the website

You can run the same check and open the same kind of preview without an AI assistant: HTML banner validator.