Choose the tester
Keep Video VAST / VPAID selected, or choose Display / HTML for a display tag.
USER GUIDE
From tag to answers,
in a few clicks.
Follow these quick paths to inspect an ad tag or validate a creative file before it is trafficked.
How to test a tag
Video VAST / VPAID is selected when the tester opens. Choose Display / HTML when you are testing a banner, JavaScript, iframe, or other display tag.
Copy the tag
Copy the complete HTML, JavaScript, VAST XML, or HTTPS VAST URL.
Paste it
Paste the full tag into the code field without removing macros or trackers.
Run the test
Choose Run video tag or Run display tag, then review the preview, status, and detected components.
How to read a TagCheck report
TagCheck reports only what can be supported by the submitted tag, a resolved VAST response, or an enabled live preview. Use the evidence labels to separate confirmed findings from items that still need professional review.
Visible evidence
The component or signal is visible in the submitted tag or resolved response.
Needs confirmation
A possible issue needs professional confirmation; it is not automatically a trafficking failure.
Not exposed in the tag
The signal was not visible in the submitted code. It may still be configured or added when the ad is served.
Serving environment required
Final delivery, targeting, click resolution, and measurement behavior require the real serving environment.
IAS and CM360 landing pages
If IAS evidence or a landing-page URL is not visible in the pasted tag, TagCheck does not treat that as proof that it is absent from the campaign. CM360 can apply verification and resolve a campaign-level click-through only when the creative is served.
Creative previews and clicks
Display previews keep the complete creative visible and centered according to its detected dimensions, including portrait formats such as 160 × 600. When no literal landing-page URL is exposed, clicking the rendered CM360 creative can open its serve-time destination in a new tab. This may contact the ad server and record a QA click, so use only authorized test placements.
Report actions
Open Actions to show technical details, copy a QA summary, or print and save a privacy-safe PDF. The PDF excludes the complete submitted tag, landing-page URLs, tracker URLs, and placement identifiers.
How to validate a creative
Use Creative Validator for PNG, JPG, WebP, GIF, and HTML5 ZIP files. The file is inspected in your browser and is not uploaded or stored by TagCheck.
Choose a file
Select one supported image, GIF, or HTML5 ZIP package from your device.
Confirm details
Check the detected dimensions, file type, file size, and optional expected placement size.
Inspect the preview
Review the rendered creative. HTML5 packages run locally in a sandbox with external requests and pop-ups blocked.
Review checks
Inspect asset references, click setup, HTTPS usage, third-party calls, dimensions, and package limits.
Check passed
The inspected file meets that technical check. It is still not a guarantee of publisher or platform approval.
Take a closer look
A possible issue or manual decision needs attention; it does not automatically mean the creative must be rejected.
Safe visual check
Reload the preview if needed. Blocked network content may differ from the final creative in its live serving environment.
Terms and important notes
Purpose of the service
TagCheck provides automated technical observations about advertising tags. Results are informational and intended to support, not replace, professional Ad Operations review.
No publisher approval guarantee
A PASS or “likely accepted” result does not guarantee that a publisher, platform, ad server, browser, device, or measurement vendor will approve or successfully run a tag. Specifications and live serving behavior may change.
Your responsibility
You are responsible for the tags you test, your authority to access them, the accuracy of campaign settings, and the decision to traffic or distribute a tag. Confirm material requirements directly with the applicable publisher or platform.
Third-party services
Previews can interact with third-party systems. Their availability, content, tracking, security, and privacy practices are outside TagCheck’s control and may be governed by separate terms.
Availability and changes
The service may be changed, interrupted, limited, or discontinued. Detection rules and compatibility guidance may be updated as advertising technology evolves.
Disclaimer
TagCheck is provided on an “as available” basis. To the extent permitted by applicable law, no warranties are made about completeness, accuracy, availability, fitness for a particular purpose, or error-free operation.
Usage rules
By using TagCheck, you agree to use it responsibly. TagCheck and CheckYourTag.com are owned and operated by Marin Creative Solutions LLC. Questions can be sent to susana@checkyourtag.com.
Permitted use
- Test tags, files, and URLs that you own or are authorized to review.
- Use reports as part of normal campaign QA and troubleshooting.
- Share summaries only with authorized teammates, clients, publishers, and vendors.
Live requests and operational safety
VAST resolution, redirect checks, and enabled creative previews may contact third-party systems and create requests that resemble impressions, pixels, verification activity, or video events. Use test placements and non-production measurement endpoints whenever possible, and enable live execution only when authorized.
Prohibited use
- Do not test stolen, confidential, or unauthorized material.
- Do not generate fraudulent impressions, clicks, conversions, or measurement events.
- Do not use TagCheck to scan networks, access private systems, bypass controls, or retrieve unrelated content.
- Do not overload the service, distribute malicious code, compromise browsers, or violate another party’s rights or applicable law.
Enforcement and changes
Access may be limited when activity appears unsafe, abusive, unlawful, or inconsistent with these rules. The service, supported formats, detection rules, and these terms may change or be discontinued.