Generating a free QR code takes seconds, but most free generators produce a static code — the destination web address is permanently baked into the image itself. That's fine for a one-time flyer, but it's a real problem for anything you print and reuse: a menu, a business card, an ID badge, a storefront sign.
Static vs. dynamic, in practice
If you print a static code pointing at your Instagram profile and later switch to a Linkaty page instead, every printed copy of that code is now dead — there's no way to update it. A dynamic QR code solves this by pointing at a short link you control, one that can be repointed to a new destination at any time without reprinting anything.
What to actually generate a code for
A QR code on an ID card or employee badge that links to a contact page. A code on a printed restaurant table tent that links to a digital menu. A code on packaging or a storefront window that links to your ordering page. In every case, generate it as a dynamic code from the start, even if you don't need to change the destination today, the printed material usually outlives the plan.
Free is fine for testing. Dynamic is what actually protects the money you spend on printing.