I put this collection of tools together mainly to sharpen my HTML, CSS, JavaScript and PHP skills. Let me know if you find them useful or if you have any suggestions.
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Colour converter
Convert hex colours to RGB and back
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DNS lookup
Get DNS records for a hostname
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HTTP header checker
Check HTTP headers for any URL
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Image converter
Convert images into other formats
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IP address finder
Find your public IP address
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MX lookup
Get MX records for a hostname
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Password generator
Generate a strong password
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Percentage calculator
Work out percentage-based sums
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UTM URL builder
Build tracked links for Google Analytics