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QRtub generates QR code images from your Links on demand. One Link gives you a PNG; several give you a ZIP of PNGs. There are no appearance options — every code comes out the same size, the same colors, and the same format.

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Downloading one code

Open a Link’s row menu and choose Download QR Code. You get a single PNG named after the slug, like qr-code-cra0042.png. What is encoded is the Link’s full public address — https://qrtub.com/r/x5fgd for a random Link, https://qrtub.com/cra0042 for a numbered or custom one — not the slug on its own. That is what makes the image scannable by any phone camera.

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Downloading many at once

Select the Links you want and choose Download QR Codes from the bulk menu. With more than one selected you always get a ZIP archive named for the day, like qr-codes-2026-08-22.zip, containing one PNG per Link named the same way as a single download. There is no option to receive many separate files instead. Because the filenames carry the slug, they line up with the Short URL and Full URL columns of an exported print list — which is how a print shop matches each image to its data row. Neither column is a byte-for-byte match for the filename, though: Short URL adds a leading slash and, for random Links, an /r/ prefix, and Full URL adds the protocol and domain. Whoever does the matching has to strip those. The images are generated in your browser, in batches of fifty, with a progress indicator counting up as it goes. A few dozen codes is instant. Several thousand takes minutes, and the tab has to stay open for the whole time — if you close it, you get nothing and have to start again. If you used “select all”, QRtub fetches the full matching set of Links first, so the total you see counts every match, not just the page on screen.

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What you cannot change

This is worth being explicit about, because most QR generators expose these settings and QRtub does not:
  • Format is PNG only. There is no SVG, PDF or EPS export anywhere in QRtub today. If your printer needs vector artwork, they will regenerate the code from the URL — which is normal practice, and the URL is all they need.
  • Size is fixed at 1024 × 1024 pixels. Big enough to print at any realistic tag size, and not adjustable.
  • Colors are fixed at black on white. No brand color, no inverted version, no transparent background.
  • Error correction is not exposed. There is no setting for it, so you cannot raise it for codes that will be scratched or partly obscured. Design around it instead: print bigger, and print the address in readable text under the code so it can be typed when the code is damaged.
  • Nothing is added to the image. No logo, no caption, no border, no slug printed underneath. Whatever surrounds the code is your layout’s job.
The PNG includes a white margin two modules wide around the code. Print specifications commonly ask for a quiet zone of four modules, so if you are laying these images out yourself, keep clear space around them rather than assuming the exported margin is enough.