Testing and Validation Tools
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Here you will find a collection of useful tools and resources we’ve enountered on the web. As we discover new tools and as new ones are developed, we’ll keep adding them here. Please note that rewriteguide.com is not associated with any of these websites and that following these links will take you from this website.
If you have, or know of, a useful application or tool you feel should be listed here, please feel free to submit it via our contact page.
Compression Tools
- GZip / Brotli Compression TestTest whether a site is currently using compression or not.
- Varvy Compression CheckerWebsite compression checking tool from Varvy.
DNS Tools
- DNS Propagation CheckerPerform a DNS lookup to check the current IP address and DNS record information for a domain against multiple name servers located in different parts of the world.
- Various DNS and Lookup ToolsVarious DNS tools including Whois lookups, reverse DNS lookups, shared IP host lookups and more.
Mobile Tools
- Mobile-Friendly Test - Google Search ConsoleTests how easily a visitor can use your page on a mobile device.
- Mobile Friendliness and SEO CheckerTool to check mobile friendliness and mobile SEO from Varvy.
- Bing - Mobile Friendliness CheckerTest how mobile-friendly a page is from the perspective of Bing.
SSL Tools
- SSL Server TestThis free online service performs a deep analysis of the configuration of any SSL web server on the public Internet.
- Self-signed SSL GeneratorIf you have no need for a trusted certificate, and just require one for internal / development use, this is for you.
- SSL Format ConverterConvert SSL certificates to and from different formats such as pem, der, p7b, and pfx.
Optimization Tools
- MinifyMake your website smaller and faster to load by minifying the JS and CSS code. Removes whitespace, strips comments, combines files, and optimizes/shortens a few common programming patterns.
- JSCompressJSCompress is an online JavaScript compressor that allows you to compress and minify all of your JS files by up to 80% of their original size.
- UglifyJSHandy online tool to minify (uglify) or beautify (prettify) your Javascript code and data.
- TinyPNGTinyPNG uses smart lossy compression techniques to reduce the file size of your PNG and JPG files without degrading their visual quality.
- Compressor.ioPowerful online tool for drastically reducing the size of your JPG, PNG, GIF, and SVG images while maintaining a high visual quality.
Page Speed Tools
- Web Page Speed Test (GTMetrix)Web page speed tester from GTMetrix.
- Web Page Speed Test (Google)Web page speed tester from Google.
- How to Properly Run a Speed TestHow to run a speed test and the things to consider when you do.
- Web Page Speed Test (Varvy)Page speed optimization tool from Varvy.
Validation Tools
- W3C Markup ValidatorChecks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, and more.
- W3C CSS ValidatorChecks the validity of both inline and explicit external CSS directives.
- W3C Internationalization CheckerPerforms various tests on a web page to determine its level of internationalization-friendliness.
- Regular Expression (RegEx) TesterOnline regular expression testing and validation tool.
- Regular Expressions Info and TesterMore info than you ever thought it was possible to know about regular expressions with an online regex tester as well.
- Redirect TesterAllows testing of rewrite rules in-place, showing the resulting rewrites/redirects as they occur.