Free Bannerify tool

Catch HTML5 banner problems before the ad platform does.

Inspect an HTML file or ZIP package for declared dimensions, clickTag signals, file weight, external resources, and common packaging mistakes.

Use the free tool
  • No signup
  • Free to use
  • A practical HTML5 banner compliance report

Free browser tool

HTML5 banner ad preflight checker

Your files and inputs are processed locally in this browser and are not uploaded to Hypermatic.

Choose an HTML file or ZIP package to check its structure and common ad requirements.

This is a practical preflight, not an official network certification. Always verify the current requirements in the destination ad platform.

Need the complete banner workflow?

Animate and export campaign-ready banners directly from Figma with Bannerify.

This free tool checks or plans one asset. Bannerify handles the recurring production work: animate designs, create variations, keep the source editable, and export HTML, GIF, or MP4 campaign files.

Bannerify

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Animate banners in seconds.

Animate and export production-ready HTML, GIF, and MP4 banners from Figma in seconds.

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How it works

From input to useful result in three steps.

  1. 1

    Choose the banner HTML or ZIP and enter the expected placement dimensions.

  2. 2

    Run a local inspection of the entry file, package structure, weight, ad.size declaration, clickTag, and remote assets.

  3. 3

    Fix the reported issues and verify the final creative in the destination ad platform.

Questions

HTML5 banner ad preflight checker FAQ

What does the HTML5 banner checker inspect?

It checks the package and entry HTML for common production signals including weight, dimensions, ad.size, clickTag, external URLs, hidden system files, and a readable entry document.

Does a passing result guarantee that an ad network will accept the banner?

No. Networks can apply account, campaign, vendor, policy, and serving checks that a browser preflight cannot reproduce. Use the report to catch common mistakes before official validation.

Is the html5 banner ad preflight checker free?

Yes. You can use it without an account or signup. The focused result is generated directly in your browser.

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Free practical guide

How to use a html5 banner ad preflight checker

Inspect an HTML file or ZIP package for declared dimensions, clickTag signals, file weight, external resources, and common packaging mistakes. This guide explains what the result means, how to avoid the most common interpretation mistakes, and when the related Bannerify workflow becomes the more practical next step.

Quick answer

Choose the banner HTML or ZIP and enter the expected placement dimensions. Run a local inspection of the entry file, package structure, weight, ad.size declaration, clickTag, and remote assets. Fix the reported issues and verify the final creative in the destination ad platform. The tool is free to use without an account, and your files and inputs are processed locally in this browser and are not uploaded to Hypermatic.

What does the html5 banner ad preflight checker do?

Inspect an HTML file or ZIP package for declared dimensions, clickTag signals, file weight, external resources, and common packaging mistakes. The immediate result is a practical HTML5 banner compliance report. That makes the tool useful when a focused question needs an answer before a file is handed off, a campaign is trafficked, or a production workflow begins.

The scope is intentionally narrow. It is designed for checking one banner asset or preparing one trafficking brief, not for replacing the complete production process. A useful result should make the next decision clearer while leaving the original file, design, or workflow under the user’s control.

Your files and inputs are processed locally in this browser and are not uploaded to Hypermatic. Local processing reduces unnecessary data exposure, but it does not remove the need to follow the privacy, confidentiality, and retention requirements that apply to the source material.

How should the html5 banner ad preflight checker be used?

Start with the same input that will be used in production whenever possible. Draft content, substitute files, and approximate dimensions can be useful during exploration, but the final check should use the actual export, final copy, destination, or supported range.

Work through the steps in order and keep the generated result beside the source. If the result identifies a warning, decide whether it is a real production problem, an acceptable tradeoff, or a limitation of a browser-based inspection before changing the underlying work.

  • Choose the banner HTML or ZIP and enter the expected placement dimensions.
  • Run a local inspection of the entry file, package structure, weight, ad.size declaration, clickTag, and remote assets.
  • Fix the reported issues and verify the final creative in the destination ad platform.

How should the result be interpreted?

A browser tool can make measurable signals visible, but it cannot reproduce every application, platform, rendering engine, policy, or team constraint. Treat the report as evidence for a decision rather than a universal guarantee. The strongest verification is the final uploaded preview and the current requirements of the destination ad platform.

Pay particular attention to edge cases that are easy to miss during a quick check: unusual fonts, long or localized content, hidden metadata, external dependencies, different aspect ratios, browser-specific behavior, and last-minute source changes. Re-run the tool whenever the production input changes materially.

  • Keep the package limited to the files the creative actually uses.
  • Confirm the current network specification immediately before trafficking.
  • Test click behavior and animation timing in the final uploaded preview, not only in a local browser.

Common questions about html5 banner ad preflight checker

What does the HTML5 banner checker inspect? It checks the package and entry HTML for common production signals including weight, dimensions, ad.size, clickTag, external URLs, hidden system files, and a readable entry document.

Does a passing result guarantee that an ad network will accept the banner? No. Networks can apply account, campaign, vendor, policy, and serving checks that a browser preflight cannot reproduce. Use the report to catch common mistakes before official validation.

Is the html5 banner ad preflight checker free? Yes. You can use it without an account or signup. The focused result is generated directly in your browser.

When does Bannerify become the better workflow?

The free tool is the right choice for a quick individual check, calculation, preview, or template. It remains useful even if the task only occurs once and no broader production workflow is needed.

Bannerify becomes more practical when the same job turns into animating, adapting, naming, and exporting complete campaign banner sets. At that point, keeping the work close to the Figma source reduces repeated exports, copy-and-paste steps, inconsistent decisions, and handoff drift.

Before adopting any workflow, compare the time spent on the recurring manual process with the setup and review required by the tool. The goal is not to add another application; it is to remove repetitive work while preserving the quality checks that still need human judgment.