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Appspot
h5validator.appspot.com › dcm
HTML5 Validator
Privacy Policy - Terms of Service · Feedback · feedback
Ad Tag Validation
Privacy Policy - Terms of Service · Feedback · feedback
Asset
Privacy Policy - Terms of Service · Feedback · feedback
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AdValify
advalify.io
HTML5 Ad Validator | Online Ad Performance Testing Tool
Check 42+ ad quality tests for ad performance — validate against IAB and Google HTML5 ad guidelines
validator service by the World Wide Web Consortium
The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type … Wikipedia
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W3C
validator.w3.org
The W3C Markup Validation Service
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.
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Reddit
reddit.com › r/adops › google's old html5 validator finally stopped working
r/adops on Reddit: Google's old HTML5 Validator finally stopped working
August 25, 2025 -

We are seeing file errors on upload for the first time ever since it was announced at least a year ago that the tool was being deprecated (I never understood why Google doesn't like it, except they want revenue).

Seeing as this tool is no longer maintained, could this be the end of the free H5 vaildator for AdOps and Creators? Are there other free HTML5 validators out there that work as good?

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Google Support
support.google.com › webdesigner › answer › 7375764
The Ad Validator - Google Web Designer Help
The Ad Validator in Google Web Designer checks your ad for common issues and displays the results in a panel, along with basic information such as the ad environment, the total size of the ad if it were to be published, and its initial load size.
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Ad Reform
blog.adreform.com › using-a-html5-validator-for-flawless-ad-creatives
Using a HTML5 Validator For Flawless Ad Creatives
October 9, 2025 - Learn to use a HTML5 Validator to quickly improve ad creative quality. This guide provides actionable steps for seamless QA and better campaign performance.
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Reddit
reddit.com › r/adops › html5 validator
r/adops on Reddit: HTML5 Validator
February 15, 2019 -

Google DCM HTML5 Validator will be deprecated without a replacement March '21..

Our studio relies on this to make sure creatives will not be rejected when uploaded to DCM. Anyone know of any alternatives? Thanks!

EDIT: Nevermind! deprecation postponed, thanks to anyone who raised concerns..

Find elsewhere
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Zuuvi
help.zuuvi.com › all collections › creative manager › ✅ validate your html5 banner before it goes live
✅ Validate Your HTML5 Banner Before It Goes Live | Zuuvi Help Center
Before sending your banner into the world, it's smart to make sure it’s in tip-top shape. The HTML5 validator is a quick and easy way to ensure your exported creative meets all requirements across Google Ads, DV360, Campaign Manager 360, and Google Ad Manager.
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PPC Land
ppc.land › html5-validator-tool-for-campaign-manager-to-be-deprecated-in-april-2025-2
HTML5 validator tool for Campaign Manager to be deprecated in April 2025
January 27, 2025 - The tool performs three critical functions: it allows users to upload html5 creatives in zip format, reviews validation results to determine acceptance by Campaign Manager, and provides detailed error messages for troubleshooting issues. Bradley Lancaster, a member of the advertising operations community who identified himself as working with Google Partners, shared insights about potential alternatives: "The functionality will exist in Campaign Manager 360 / Display & Video 360.
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GreenSock
gsap.com › forums › banner animation
Help prevent Google/DoubleClick HTML5 Validator from being depreciated - Banner Animation - GSAP
January 17, 2025 - Hi all, Google's HTML5 validator is being depreciated in March 2021. I encourage you to fill out the feedback from on the top right of that page, or directly here to advocate against its depreciation. Thanks! Most of us know this is a great tool for banner validation and if you don't know about i...
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FreeFormatter
freeformatter.com › html-validator.html
Free Online HTML Validator - FreeFormatter.com
Validates HTML files for compliance against the W3C standards and performs linting to assess code quality against best practices. Find missing or unbalanced HTML tags in your documents, stray characters, duplicate IDs, missing or invalid attributes and other recommendations.
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Googleads
googleads.github.io › googleads-ima-html5 › vsi
IMA HTML5 Video Suite Inspector
If you do not have an HTTPS version of this tag, you can test using our IMA HTML5 SDK Advanced Demo hosted on GitHub. ▸ Advanced controls · MIME types (optional): video/mp4 · video/webm · video/ogg · audio/mp4 · VPAID mode: Enabled · Insecure · Disabled · Preloading media: True · False · Customize Open Measurement access rules: No · Yes · Verification vendor · COMSCORE · DOUBLEVERIFY · GOOGLE ·
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PlayableMaker
playablemaker.discourse.group › general
Google html validator not working? - General - PlayableMaker
April 10, 2025 - Hello guys, its not just your ads but in general google html validator is often showing me error, but I found out that that in campaigns these errors doesn’t exist. So does google have any validator before adding playabl…
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Chrome Web Store
chromewebstore.google.com › detail › mpbelhhnfhfjnaehkcnnaknldmnocglk
HTML Validator - Chrome Web Store
It checks the code, syntax, of your HTML 5 pages. HTML Validator for Chrome is a browser extension that adds HTML validation inside Developer Tools of Chrome. The number of errors of a HTML page is seen with an icon in the browser status bar.
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Validator.nu
validator.nu
Validator.nu - Nu Html Checker
This tool is an ongoing experiment in better HTML checking, and its behavior remains subject to change · Show sourceoutlineimage reportcheck error pagesUser-Agent Accept-Language
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Previewads
previewads.com › html5-ad-tester
HTML5 Ad Validator & Tester - Powered by Ad Reform
However, specific HTML5 features like WebGL, advanced animations, or audio may have different support levels. Our validator tests your ads across multiple browser environments to ensure compatibility.