What is the error correction level of a QR code?

The error correction level of a QR code indicates how much can be recovered when part of the code becomes unreadable due to dirt or damage. There are four levels: L (about 7%), M (about 15%), Q (about 25%), and H (about 30%).

What is the version of a QR code?

QR code versions range from 1 to 40; the higher the version, the more modules it has and the more data it can store. Version 1 is 21x21 modules, and version 40 is 177x177 modules.

QR Code Analyzer - Free Online QR Code Inspector

About QR Code Analyzer

QR Code Analyzer is a free online tool that instantly analyzes and displays technical details of a QR code, such as the error correction level, version, mask pattern, and encoding mode, simply by uploading a QR code image.

Information You Can Analyze

Version: A number from 1 to 40 that determines the size of the QR code. The higher the version, the more data it can store.
Error Correction Level: Four levels - L (7%), M (15%), Q (25%), H (30%). Indicates the ability to recover from dirt or damage.
Mask Pattern: 8 types from 0 to 7. An XOR pattern applied to the data modules to improve reading accuracy.
Encoding Mode: Data type such as numeric, alphanumeric, byte, or kanji.
Module Structure Map: Displays the finder patterns, timing patterns, alignment patterns, format information, and data area in color-coded form.

Who It's For

Ideal for developers who need to verify QR code quality, designers who want to check whether a printed QR code was generated correctly, and students or engineers who want to learn how QR codes work. Everything runs in your browser, so images are never sent to a server.