Free QR Code Generator - Create Scannable QR Codes

What Is a QR Code Generator?

A QR code generator is a tool that turns text, such as a web address, into a QR code: a square pattern of black and white squares. A phone camera or barcode scanner reads the pattern and recovers the original text almost instantly.

How This Tool Encodes Text

Type text or a URL into the input box. The tool converts every character to its UTF-8 byte values and encodes them using "byte mode," one of the ways the QR code standard, ISO/IEC 18004, stores data. It builds the code at error-correction level M, the standard's second of four correction levels, and picks the smallest of the 40 possible QR code sizes, called versions, that can hold the input. It then tests eight fixed patterns, called masks, and keeps the one that spreads dark and light squares most evenly, which makes the code easier for a scanner to read. The QR code updates automatically after a short pause in typing.

This tool always uses byte mode and error-correction level M. It does not offer a numeric or alphanumeric mode, a Kanji mode, or a choice of correction level.

How to Calculate QR Code Capacity

A QR code version's capacity depends on its total codewords (groups of 8 bits) and how many of those codewords are set aside for error correction.

data codewords = total codewords − error-correction codewords

The number of bits a piece of byte-mode text needs is:

needed bits = 4 + character-count bits + 8 × number of bytes

The 4 bits identify the encoding mode. The character-count field is 8 bits for versions 1 through 9, and 16 bits for versions 10 and up. The tool checks each version from 1 to 40 in order and uses the first one whose data capacity, in bits, is large enough.

Example

The text "https://whiz.tools" is 18 characters, all plain letters and symbols, so it becomes 18 bytes.

Version 1 (21×21 squares) has 16 data codewords, or 128 bits. The text needs 4 + 8 + (8 × 18) = 156 bits, so it does not fit.

Version 2 (25×25 squares) has 28 data codewords, or 224 bits. The same 156 bits fit, so the tool builds a version 2 code for this text.

Error Correction and Masking

Error-correction level M lets a QR code stay readable even if part of it is smudged, torn, or covered, up to roughly 15 percent of its data, by adding extra codewords calculated with Reed-Solomon error correction, the same math used on CDs and DVDs. Level M sits in the middle of the standard's four levels: level L tolerates about 7 percent damage, level Q about 25 percent, and level H about 30 percent. This tool always builds at level M.

Once the data sits in the grid, the tool tries all eight standard mask patterns. Each one is scored by counting features that confuse scanners, such as long runs of the same color, solid blocks, patterns that look like a corner finder square, and an uneven mix of light and dark squares. The tool keeps the mask with the lowest score.

How to Use This QR Code Generator

1. Type or paste text, a web address, or another short message into the input box.
2. The QR code appears below the box a moment after typing stops.
3. Select "Download QR Code" to save the image as a PNG file.
4. Select "Reset" to clear the box and start over.

The input box accepts up to 500 characters. The text is also stored in the page's web address, so sharing that link reproduces the same QR code for anyone who opens it.

What This Tool Does Not Do

The generator does not offer a choice of error-correction level, custom colors, a logo overlay, or an SVG export. The only download format is PNG. Every code it produces keeps the blank border, called the quiet zone, that scanners use to find the edges of the pattern, and follows ISO/IEC 18004, so any standard-compliant scanner can read it.

History

Denso Wave, a Japanese company that made parts for Toyota, invented the QR code in 1994 to track components faster than a regular barcode allowed. Because a scanner could read it quickly, the company named it a "Quick Response" code. It became part of the open international standard ISO/IEC 18004 in 2000, later revised, including the 2015 edition this tool follows. Camera phones with built-in QR scanning made the format common well before 2020, and contactless menus and payment codes during the COVID-19 pandemic made it familiar to far more people.

Common Uses of QR Codes

QR codes commonly appear on:

• Restaurant tables, linking to a digital menu
• Product packaging, linking to instructions or ingredient details
• Posters and business cards, linking to a website or contact page
• Wi-Fi network cards, when the text is formatted in a way scanners recognize
• Event tickets and boarding passes, for fast check-in scanning

Frequently Asked Questions

What is the maximum amount of text this QR code generator can encode?

The input box accepts up to 500 characters. The QR code standard allows far more: a version 40 code at error-correction level M, the level this tool uses, can hold about 2,331 bytes of text.

Why does the QR code get bigger for longer text?

A QR code stores data in a fixed grid of squares. Longer text needs more codewords, so the tool switches to a larger version, meaning more rows and columns, whenever the current version cannot fit the input.

Can this tool add a logo or custom color to a QR code?

No. It draws black squares on a white background and does not support logos, custom colors, or SVG export. The download is always a PNG image.

Does a QR code expire?

No. The code stores the exact text entered when it was made. If that text is a web address, the code stops being useful only if the address stops working; the image file itself does not expire.

Is a damaged or partly covered QR code still readable?

Often yes. Error-correction level M, which this tool always uses, can rebuild the code even if roughly 15 percent of it is missing or unreadable, as long as the three corner squares stay intact.

What is the difference between a QR code and a regular barcode?

A standard barcode stores data in one direction and typically holds a few dozen digits. A QR code stores data across both rows and columns, so it can hold thousands of characters in the same space, and it includes built-in error correction that ordinary barcodes lack.