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Yes, of course, there's a limit to everything.

The nominal limit is 7,089 characters, though it depends on the encoding mode, symbol size, and error correction level.  The spec is here:

https://www.qrcode.com/en/about/version.html

Also, there are practical limitations on how much data various scanners and applications can scan.  If you actually make a QR barcode with 7000 characters, it's going to either be huge, or have pixels so small that any phone will have trouble reading them.

So my advice is: keep the QR codes small. If you have to encode a large amount of data, consider encoding a URL to a webpage or a PDF with the information instead.

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