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When digital works best
A digital invitation reaches every guest at once by WhatsApp or email, including family abroad. There is no printing or postage, and you can correct a time or venue after sending.
When paper works best
Paper suits guests who do not use smartphones, and it gives people something to keep. It needs longer lead times, and changes mean printing again.
How to combine them
Send a small printed card to close family with a QR code that opens your wedding website. Everyone else gets the same website by link, so all details stay in one place.