QR Code Error Correction Explained: L, M, Q, H
A practical guide to QR error correction levels: what each does, when to use it, and how it affects scannability and print reliability.
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Short practical posts on QR codes. The kind of thing you wish someone had just told you before you printed a hundred business cards.
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Start with the question you have
Every guide below assumes the same core promise: LocalQR creates QR codes entirely in your browser, with no upload, no watermark, and no sign-up.
What does error correction do?
L, M, Q, and H explained. When to use each level and how it affects scannability.
Print vs digital QR codes?
Sizing, resolution, error correction, and PNG vs SVG for each medium.
How do I make a URL QR code?
Paste a link, customize colors, and download a scannable QR code in seconds.
How do I make a vCard QR code?
Enter contact details and get a QR code that phones can save directly.
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Print vs Digital QR Codes: Sizing, Resolution, and Error Correction
How to size QR codes for print and digital: minimum sizes, resolution, error correction, and PNG vs SVG for each medium.