About pxto.io

Welcome to pxto.io. We built this platform because we were tired of Googling "px to rem" or "a4 size in pixels" and landing on clunky, ad-filled websites that were slow to load and difficult to use.

Our mission is simple: to provide the fastest, cleanest, and most accurate unit conversion tools for web developers, UI/UX designers, and print professionals. Whether you are translating a Figma mockup into responsive CSS using rem and viewport units, or preparing a large-format poster for print using physical units and DPI calculations, pxto.io is designed to give you instant answers without breaking your workflow.

Built for the Modern Web

We continuously update our calculators to support modern CSS features like container query units (cqw, cqh) and dynamic viewport units (dvh, svh, lvh) so you always have the right tools for the bleeding edge of web design.

Free and Open

pxto.io is completely free to use. No sign-ups, no paywalls, and no intrusive popups. Just bookmark us and keep building amazing things.