Website validation and testing tools


HTML validation with Nu Html Checker* [+]

Recursive HTML validation with data·yze Website Validator* [+]

CSS validation with W3C CSS Validation Service - Jigsaw* [+]

Link checking with Dr. Link Check* tool (lite edition, max 1500 links)

Link and anchor checking with W3C Link Checker* [+]
Note: Some methods and URI schemes are not supported, and some sites may prohibit the use of the W3C Link Checker. Please keep the recursion level low.

Test for compliance with modern and reliable Internet standards by the Dutch Internet Standards Platform at Internet.nl* [+]

Web accessibility evaluation with WAVE Web Accessibility Evaluation Tool*

Performance evaluation with GTmetrix* [+]

Transport level security evaluation with Qualys SSL Labs Server Test* [+]

HTTP security headers assesment with Security Headers* [+] tool

DNS Security check with DNSSEC Analyzer* [+] by Verisign Labs

Website scanning and analysis with urlscan.io*
When a URL is submitted to urlscan.io, an automated process will browse to the URL like a regular user and record the activity that this page navigation creates.

General security testing with ImmuniWeb Website Security Test*
Checks website for GDPR and Payment Card Industry Data Security Standard technical compliance, security and privacy. Note: ImmuniWeb may get the website location wrong.


Clicking the [+] fills in the target petri.kutvonen.net for the tool automatically.

Last edited August 2020