Is HTML Validator safe?

Clean risk

Adds HTML validation results to Chrome Developer Tools for HTML5 pages.

This extension checks HTML code and syntax using an embedded HTML Tidy validator that runs locally in the browser. It shows the number of errors with a browser icon and provides detailed errors, warnings, optional accessibility warnings, and a cleanup proposal in Developer Tools.

Marc Gueuryv0.9.9.8Chrome Web Store
0Risk
Who publishes it

Marc Gueury - no other listings under this identity, 19 shared hostnames

What this publisher told the store about itself, and the other listings that told it the same thing.

Publisher
Marc Gueury

Shared hosts - 19 hostnames

Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.

gueury.com
Also called by 1 other listing: Html Validator
artikel.fabrice-pascal.de
Also called by 2 other listings
codehouse.com
Also called by 2 other listings
cs.tut.fi
Also called by 2 other listings
ex.fr
Also called by 2 other listings
exemple.net
Also called by 2 other listings
gasl.org
Also called by 2 other listings
gutfeldt.ch
Also called by 2 other listings: Html Validator, HTML Validator
html-tidy.org
Also called by 2 other listings, including Html Validator
htmlpedia.org
Also called by 2 other listings, including Html Validator
la-grange.net
Also called by 2 other listings, including HTML Validator
openjade.sourceforge.net
Also called by 2 other listings
ppewww.ph.gla.ac.uk
Also called by 2 other listings
thunders.ca
Also called by 2 other listings, including HTML Validator
tidy.sourceforge.net
Also called by 2 other listings, including HTML Validator
456bereastreet.com
Also called by 3 other listings
htmlhelp.com
Also called by 3 other listings
iso.ch
Also called by 4 other listings, including Seerfar - Analysis Extension for Ozon and Wildberries
alanwood.net
Also called by 6 other listings, including 中古車の価格変動が丸わかり - 中古車チェッカー, ショッピングリサーチャー

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

What it can do

Permissions this extension asks for, as declared in version 0.9.9.8. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.

  • Read and change your data on every site you visit

    <all_urls>

  • Store data in your browser

    storage

  • Act on the current tab, but only after you click the extension

    activeTab

  • Write to your clipboard

    clipboardWrite

  • See every page you navigate to, as you navigate to it

    webNavigation

  • Run its own code inside the pages you visit

    scripting

Updated 30 September 2026mpbelhhnfhfjnaehkcnnaknldmnocglk