• To help find and fix broken links (= dead links)
• "404" error
• "File not found" error
• "Page not found" error
• Examples

HTML

• Link Checkers
• CSE HTML Validator - HTML, XHTML, and WML syntax checker
• Dr. Watson (http://watson.addy.com) checks one page at a time interactively.
• HTML TIDY - Clean up your Web pages - $0
  • HTML Tidy Project
  • HTML Tidy for Windows - HTML Tidy for Windows
  • GuiTidy
• Adobe Dreamweaver (formerly by Macromedia)
• W3C HTML Validation Service
• W3C CSS Validation Service
• WDG's Links to Validators - (Web Design Group)
• Web Authoring Tools
• XHTML & XML Validation...

• W3C HTML Validation Service

• ---

• CSE HTML Validator - HTML, XHTML, and WML syntax checker
• HTML TIDY - Clean up your Web pages (free)
• Adobe Dreamweaver (formerly by Macromedia)
• W3C HTML Validation Service
• XML Resources and Validators - WhoIsHostingThis.com | Thanks to Marilyn Shaw for recommending this site.

• See also:  Links ...
• Link Checkers / Validators ...
  • To help find and fix broken links
  • "404" error
  • "File not found" error
  • "Page not found" error
• Make sure the link checker supports SSL certificates and can create a Site map.
• AM-DeadLink - Because nothing lasts forever @ AskWoody
  • AM-DeadLink - OlderGeeks.com Freeware Downloads
• Link checkers - ZOMDir
• LinkChecker - Check websites for broken links - $0
  • LinkChecker > Edit (menu) > Options > Edit (button/bar) > change #sslverify=1 to sslverify=0
    • sslverify=0
    • checkextern=1
      or check-extern=1
    • recursionlevel=6
      Edit (menu) > Options > Recursive Depth > 6
      
    • Error: SSLError: [Errno 1] _ssl.c:510: error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure
      • How to stop this annoying error message for so many external links??
        
  • SSL Error hostname doesn't match error in LinkChecker - Help - Let's Encrypt Community Support
    • This error is caused by your LinkChecker software not supporting Server Name Indication (SNI). Your webhost is only returning the correct Let's Encrypt certificate that covers austinpartners.org when the client sends an SNI value for austinpartners.org. Web browsers do this by default so the website works without error. Your LinkChecker does not, so it gets the wrong certificate back and causes an error.
    • You don't have to worry about this error unless you care about very old software that doesn't support SNI. If you do, you'll have to ask your webhost to fix the problem, likely by providing you a dedicated IP to map your certificate to.
    • Solution:  LinkChecker > Edit (menu) > Options > Edit (button/bar) > change #sslverify=1 to sslverify=0
      • https://github.com/wummel/linkchecker/issues/715
        • "You may have made the same mistake I did, before I looked deeper in the file ; all settings in the configuration file for Windows desktop version are remarked with #, and it is using default value instead.
          Remove the "#" before sslverify=0 then it will presumable work, it worked for me.
          My problem is because the certificate is created by Let´s Encrypts and it generate a shared certificate, and therefore it find that the certificate is for an other domain than I am testing.
          Shared certificate is very common, and I hope that LinkChecker will make it just as a warning and then proceed instead of stopping."
  • LinkChecker - Other free link checkers
• Xenu's Link Sleuth - $0
  • Report - Must generate a "Report" in order to get useful info. Easy to use, User-friendly, FAST (compared to the other link checkers), Report easy to generate, Report easy to understand and use.
    
    • Includes a site map.
  • The Report does not show the line number of the broken link. The Report does not show the name for the broken link (as shown in the browser). Limited number of options.
• Fast Link Checker - WebTweakTools.NET - US$50
  • Much more detail than Xenu, More options than Xenu, Much slower than Xenu
• Alert LinkRunner - Fast, intuitive, easy to use, not too expensive (US$40) - creates reports ordered by source file and stored as html or txt.
  • Faster than FastLinkChecker
  • Interface not very intuitive
  • Checks locally, but the report only shows the host links (i.e. not the links to your pages on your hard drive)
  • No tech support.  Their Website has broken links.  (ordering, forums, etc?) 
  • Is this company on the brink of closing?
• ---
• Broken Link Checker / Online URL Validator - finds bad / dead weblinks - $0
• LinkAlarm - Link Check Your Sites - US$0.01 per page per check - This is VERY expensive!! (= TOO expensive)
• Linkbot Pro $US395 - 15 days trial   (Excellent product, easy to use)
  • tetranetsoftware.com - this site has disappeared
• LinkScan/QuickCheck checks one page at a time interactively.
  • LinkScan is a link checker for websites & makes sitemaps - $850 for 500 documents
• Macromedia - Dreamweaver
• Microsys Software - A1
  • See also:  LinkChecker - $0
  • See also: Microsys A1 Website Download ...
  • Link Checker and Website Analyzer - US$69/year
  • TechSEO360 - Desktop Crawler for Technical SEO and Site Audits - US$99/year or Limited Free mode
    • Technical SEO Website Crawler - TechSEO360
      
      • TechSEO360 combines A1 Sitemap Generator, A1 Website Analyzer and certain tools from A1 keyword Research into a single tool.
        • 30 days free trial; $99/year for professionals; $0 for hobbyists (limit 500 pages) starts when trial ends.
      • A1 Sitemap Generator
      • A1 Keyword Research
      • A1 Website Analyzer
      • A1 Website Download
      • A1 Website Scraper
      • A1 Website Search Engine
    • TechSEO360 Help and Tutorials
    • Webmaster Help Forums
    • Send e-mail to request a discount code.
• Perl
  • cpan.org/authors/id/A/AJ/AJDELORE/XLinks-1-1-1.pl
    • Link validator for XHTML web pages. Based on XML parsing methods, this script allows a high degree of control on a page-by-page and link-by-link basis. Able to crawl entire sites.
    • Complete documentation used to be at http://www.sfu.ca/~ajdelore/XLinks/
• WDVL: Links Checkers
• W3C Link Checker
• Web Link Validator: The Broken Links Doctor - $145
  • 30-day trial limits you to only 500 links per site
  • REL Link Checker - $0
    • Checks 1000 links per site, but has fewer features available (compared to its big brother, Web Link Validator)
    • Not very intuitive or user-friendly.
    • USELESS!!!!!!!!!!!!!!!!!!
    • This program lists the links that are broken, but does not tell you what page the link is in.  How can you fix the link if you don't know what file it is in?????
    • STUPID!!!!!!!!!!!!!!!!!!!!!!!!!
• WebAnalyzer (incontext.com) is no longer available since February 2002 and hasn't been updated for years), is no longer available since February 2002 and hasn't been updated for years)
• Broken Link Checker – WordPress plugin | WordPress.org

Examples of broken links caused by stupid sites that move or remove pages .

• "404" error
• "File not found" error
• "Page not found" error
• Examples

Page inexplicably removed from site by site's 'Webmaster'

InformationWeek	InformationWeek.com - Articles are deleted for no reason and you are sent to the default homepage.
PCWorld
eWeek
The Montreal Gazette If you want to find a previous article, you can just forget about it.  Try the archives (if you can find them). Try this:  Archives | News |The Gazette - ($5/article)
La Presse
The Globe & Mail