Quick-response (QR) codes hold alphanumeric data in a square grid of dark and light modules. Their built-in Reed-Solomon error correction lets almost one-third of the pattern be damaged yet still decode, making them ideal for posters, receipts and contactless menus.

This generator turns your link, text, contact or network credentials into a standards-compliant QR symbol, then lets you restyle dots, “eyes”, colours, gradients and frames before exporting high-resolution artwork for print or screen. A reactive engine updates the preview as you type.

Imagine placing a code on event tickets: guests scan once to add dates, location and Wi-Fi in seconds, avoiding manual typos and queue delays.

Technical Details:

A QR code encodes input data as codewords, applies Reed-Solomon redundancy, interleaves blocks, occupies a two-dimensional matrix whose side length $m = 21 + 4 \times (v - 1)$ , then applies one of eight masks that minimise large contiguous areas.

Mode and version selection
Data → codeword stream
Error-correction block append
Matrix placement of data, timing, alignment and format patterns
Mask evaluation and selection with lowest penalty score

Error level	Restorable data
L	≈ 7 %
M	≈ 15 %
Q	≈ 25 %
H	≈ 30 %

Higher levels enlarge the symbol and reduce capacity but improve durability on rough surfaces.

Parameter	Meaning	Typical range
Content type	URL, text, vCard, Wi-Fi etc.	–
Size	Canvas edge length	100 – 1 000 px
Margin	Quiet-zone width	0 – 50 px
Error level	Redundancy tier	L, M, Q, H
Dot style	Square, rounded, dot	–
Foreground	Hex colour or gradient	#000000 – #FFFFFF

Version 4 example (https://simplified.tools):

45 bytes \to 360 bits

m = 21 + 4 \times 3 = 33

33 \times 33 = 1 089 modules

Assumes UTF-8 text; extended Kanji modes unsupported limitation
Gradient fills must contrast sufficiently for scanners
Logos may cover ≤ 30 % of the symbol at H-level
Frames enlarge total footprint; maintain ≥ 4-module quiet zone

Empty payload produces a blank canvas
Over-long text selects a version > 40 and will fail
CMYK colours in PDFs may shift on screen
Transparent backgrounds ignored when exporting PDF

QR specification documented in ISO/IEC 18004-2015 and AIM Symbology standard ISS DotCode Rev 4.

All processing occurs client-side; no personal or sensitive information leaves your device.

Step-by-Step Guide:

Follow these steps to create and download your code.

Select a Content icon such as URL or Wi-Fi.
Fill in the requested fields; the preview updates instantly.
Open Design and choose dot style, eyes and colours.
Activate the gradient panel for multi-tone effects if needed.
Drop a logo or pick a frame under Extras.
Click PNG, SVG or PDF to download the high-resolution file.

FAQ:

Is my data stored?

No. Everything is rendered locally in your browser; nothing is transmitted or logged.

Which error level should I pick?

Use M for everyday print, Q or H when adding logos or expecting scratches, L for minimal size on screen.

Why does my code fail to scan?

Check contrast, quiet zone, and ensure the final image is not compressed or blurred.

Are gradients safe?

Yes, provided the darkest colour exceeds 40 % luminance contrast against the background.

Can I resize after export?

SVG and PDF scale without quality loss; PNG remains sharp up to its original pixel dimensions.

Glossary:

Codeword: 8-bit unit of encoded data.
Mask: Pattern that optimises visual balance.
Quiet zone: Blank border aiding camera focus.
Module: Single square element within the grid.
Version: Matrix size indicator from 1 to 40.

QR Code Generator

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Step-by-Step Guide:

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