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

DNS Tools

  • DNS Propagation Checker
    Perform 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 Tools
    Various DNS tools including Whois lookups, reverse DNS lookups, shared IP host lookups and more.

Mobile Tools

SSL Tools

  • SSL Server Test
    This free online service performs a deep analysis of the configuration of any SSL web server on the public Internet.
  • Self-signed SSL Generator
    If you have no need for a trusted certificate, and just require one for internal / development use, this is for you.
  • SSL Format Converter
    Convert SSL certificates to and from different formats such as pem, der, p7b, and pfx.

Optimization Tools

  • Minify
    Make 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.
  • JSCompress
    JSCompress 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.
  • UglifyJS
    Handy online tool to minify (uglify) or beautify (prettify) your Javascript code and data.
  • TinyPNG
    TinyPNG uses smart lossy compression techniques to reduce the file size of your PNG and JPG files without degrading their visual quality.
  • Compressor.io
    Powerful online tool for drastically reducing the size of your JPG, PNG, GIF, and SVG images while maintaining a high visual quality.

Page Speed Tools

Validation Tools