x.com, twitter.com and why the QR outlives both
X changed domains, changed its logo, and changed how links preview — but a profile URL built on the handle has survived all of it, because twitter.com still redirects to x.com. Encoding x.com/yourhandle gives you the address that works today and the one people expect tomorrow.
QR codes solve a specific X problem: handles are short, which sounds easy to remember, but underscores and lookalike characters get mistyped constantly, and X search will happily show someone a parody account instead. A scan removes both failure modes.
The most common placements are conference badges, the last slide of a talk, and stream or video overlays. All three are read at a distance, so keep the code chunky: a handle URL is short enough to fit in a small, low-density code that scans from several steps back.
Everything happens in your browser. The QR encoder is built into this page, so your username is never sent to a server, nothing is logged, and there's no daily limit. The code is static — the link lives in the pattern itself, with no redirect service in the middle that can expire, start charging or go down.