Generate and decode / read QR code graphics.
QR code API is a free Development API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Generate QR codes as PNG or SVG with size, border and color options
QR codes and barcodes (Code 128, EAN-13, Data Matrix, PDF417 + more). SVG or PNG output
Yes. The QR code API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The QR code API requires no authentication, so you can start making requests without signing up.
CORS support for the QR code API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The QR code API is served over HTTPS, so it's safe to use in production.