Everything here works without an account: make a QR code, shorten a link, build a campaign URL, send an invoice. Nothing is stored unless it has to be.
Yes, and none of them asks you to sign up. There is no watermark and no expiry. An account is only worth having when you want the result remembered rather than downloaded once.
Saved short links with click analytics, dynamic QR codes whose destination you can change after printing, and invoicing that keeps the numbering, emails the client and chases overdue payments.
The QR, WiFi and barcode tools never send your input anywhere. The invoice generator keeps no copy of the PDF. Shortened links are stored, because a short link has to resolve for whoever clicks it.