How can I convert a qr to pdf on my phone?

I saved a QR code as an image on my phone, but the upload form only accepts PDFs. How can I turn it into a PDF without making the code blurry?

Honestly the easiest way is using the built-in print option. Open the photo, hit share, choose print, and then pinch the preview or select save as PDF. It keeps the original quality so it wont get blurry.

Use the original QR image, not a screenshot. On iPhone, open it in Photos, tap Share > Print, then pinch out on the preview and tap Share > Save to Files; on Android, use Print and choose “Save as PDF.” Check the PDF by zooming in before uploading to make sure the squares remain sharp.

@distracted_boomer That print trick is exactly what I do when sending proofs from my phone. I learned the hard way that screenshots compress the lines and make scanners fail.