Kilian Valkhof

Building tools that make developers awesome.

Software Engineering Daily podcast

CSS & HTML, 7 May 2025

Recently, wholesome human from the internet Josh Goldberg interviewed me for the Software Engineering Daily podcast. We talked about Polypane, the web development landscape, and how I got into web development.

Tag, you’re it

Life, 1 May 2025

I got tagged by Hidde to blog some answers to questions about blogging, and since I definitely don’t use this blog enough, I’m taking him up on it …roughly a month later.

Pixel with purpose podcast

Web, 25 April 2025

I recorded a podcast with the folks from Nordcraft on their new Pixels with Purpose podcast channel. We chatted about accessibility, education around that and of course about Polypane.

Advent Calendars

CSS & HTML, 6 January 2025

Happy new year! In December I was lucky enough to write articles for three different advent calendars: HTMHell, 12 days of web and the Fronteers Advent calendar.

An outline version of the new CSS logo

CSS & HTML, 20 November 2024

CSS got a new logo! After well over a decade of using the “CSS3” badge, there’s now a new CSS logo that fits nicely next to the JS, TS and friends logo’s.

Polypane browser for responsive web development and design Hi, I'm Kilian. I make Polypane, the browser for responsive web development and design. If you're reading this site, that's probably interesting to you. Try it out!

I develop more software and tools:

Superposition

Use the design system you already have

FromScratch

A cross-platform, simple and smart autosaving scratchpad.

A Messenger Adventure!

Go on a text adventure in Facebook Messenger.

FixA11y

Browser extensions that automatically fix accessibility issues.

Trimage

Drag-and-drop lossless compression of PNG and JPG images for web.

Messenger Demo Viewer

Demo your (bot) interactions on Messenger.