Tools I built for myself.

Free to use, most without an account – I made them because I needed them, and kept them online in case you do too.

Developer

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Browser info

See details about the browser and device you're using

Colour converter

Convert colours between hex, RGB, CMYK, HSV and HSL formats

Contrast checker

Check colour contrast against WCAG AA and AAA requirements

CORS checker

Test how a URL responds to cross-origin requests

Marketing

Sign-in required

Link shortener

Shorten long links into short, shareable URLs

Open Graph checker

Preview how a page looks when shared on social media

QR code generator

Generate a QR code from any text or URL

UTM URL builder

Build tracked links for Google Analytics campaigns

Design

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Colour converter

Convert colours between hex, RGB, CMYK, HSV and HSL formats

Colour palette generator

Generate colour palettes from a colour wheel using colour harmonies

Contrast checker

Check colour contrast against WCAG AA and AAA requirements

Favicon generator

Check a site's favicon setup and generate exactly the files needed to fix it

SEO

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Favicon generator

Check a site's favicon setup and generate exactly the files needed to fix it

Sign-in required

Link crawler

Crawl your entire site to find broken links fast

Meta tag checker

Check a page's title, description and SEO meta tags

Open Graph checker

Preview how a page looks when shared on social media

Calculators

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Average calculator

Calculate the mean, median, mode and range of numbers

Calculator

A simple calculator for everyday sums

Fuel calculator

Work out how much a trip will cost in fuel

Sign-in required

Income and bills tracker

Track your incomings and outgoings at a glance

Text

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Encoder / decoder

Encode and decode Base64, URL, JWT, hex and more

Lorem ipsum generator

Generate placeholder text for mockups and layouts

Password generator

Generate a strong, memorable password in seconds

Regex tester

Test regular expressions with live match highlighting

If you find any of these tools useful – or if you have any suggestions – please let me know.