I need to make thumbnails now and again for YouTube and my image editor has a few tools that are missing for my workflow. But instead of looking for another tool, I figured that I might try and build one myself. Turns out, you can get pretty far in javascript-land for this stuff these days with a little bit of vibe coding.

The tools are hosted on Github pages (repo) and at the time of writing there are two tools.

Rounding tool

Rounded squares often look so much better on thumbnail, which is exactly what this tool can add.

Outline tool

This tool can add an outline of any color to a png. This is especially useful to add a white glow to a face on a YouTube thumbnail.

Zero-shot?

The rounding tool was a zero-shot but the outline tool needed a bit of help from stack-overflow. It was really hard to describe the behavior that I needed but after copy-pasting an existing example that was close to what I wanted it figured out the right APIs to use.