px to rem and rem to px - Convert px to rem and rem to px instantly

Hey Product Hunt 👋 This is the second tool from CSS Toolkit I'm launching this week, a px to rem and rem to px converter, in both directions, with bulk conversion for when you're not just checking one value but migrating a whole stylesheet. Rem works differently from em, which I covered in the last launch. Rem is always relative to the root font size, not the nearest parent, so it doesn't compound as you nest elements the way em can. That makes it the safer default for most spacing and typography, and it also respects a user's browser font-size setting, so it plays better with accessibility than a fixed pixel value would. You can set a custom base font size (most projects use 16px, but plenty of design systems use 18 or 20), convert single values instantly, or paste a whole block of pixel values and get every rem equivalent back at once. Same as everything else on CSS Toolkit: no signup, no account, runs entirely in your browser. Would love to hear if a Sass/Tailwind-style output format for the bulk results would be useful, that's the most common request I'd expect from this crowd.