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 * QR Codes
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 * En esta página
 * Overview
 * Syntax
 * QR Code Details [Optional Reading]
 * Further Information and Standards

Warning: This API is deprecated. Please use the actively maintained Google
Charts API instead. See our deprecation policy for details.
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QR CODES

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 * En esta página
 * Overview
 * Syntax
 * QR Code Details [Optional Reading]
 * Further Information and Standards
 * 

You can create a QR code on the fly with a URL GET request.


OVERVIEW

QR codes are a popular type of two-dimensional barcode. They are also known as
hardlinks or physical world hyperlinks. QR Codes store up to 4,296 alphanumeric
characters of arbitrary text. This text can be anything, for example URL,
contact information, a telephone number, even a poem! QR codes can be read by an
optical device with the appropriate software. Such devices range from dedicated
QR code readers to mobile phones.


SYNTAX

Root URL: https://chart.googleapis.com/chart?

QR code requests support the following URL query parameters after the ? in the
root URL:

Parameter Required or Optional Description cht=qr Required Specifies a QR code.
chs=<width>x<height> Required Image size. chl=<data> Required The data to
encode. Data can be digits (0-9), alphanumeric characters, binary bytes of data,
or Kanji. You cannot mix data types within a QR code. The data must be UTF-8
URL-encoded. Note that URLs have a 2K maximum length, so if you want to encode
more than 2K bytes (minus the other URL characters), you will have to send your
data using POST. choe=<output_encoding> Optional How to encode the data in the
QR code. Here are the available values:
 * UTF-8 [Default]
 * Shift_JIS
 * ISO-8859-1

chld=<error_correction_level>|<margin> Optional
 * error_correction_level - QR codes support four levels of error correction to
   enable recovery of missing, misread, or obscured data. Greater redundancy is
   achieved at the cost of being able to store less data. See the appendix for
   details. Here are the supported values:
   * L - [Default] Allows recovery of up to 7% data loss
   * M - Allows recovery of up to 15% data loss
   * Q - Allows recovery of up to 25% data loss
   * H - Allows recovery of up to 30% data loss
 * margin - The width of the white border around the data portion of the code.
   This is in rows, not in pixels. (See below to learn what rows are in a QR
   code.) The default value is 4.

 

Example:


cht=qr
chl=Hello+world
choe=UTF-8


QR CODE DETAILS [OPTIONAL READING]

Here is a little more about how QR codes work; you don't necessarily need to
know this to be able to generate a QR code.

QR codes are squares, with an equal number of rows and columns. There are a
fixed set of QR code sizes: from 21 to 177 rows/columns, increasing in steps of
four. Each configuration is called a version. The more rows/columns, the more
data the code can store. Here is a summary of the versions:

 * Version 1 has 21 rows and 21 columns, and can encode up to 25 alphanumeric
   characters
 * Version 2 has 25 rows and 25 columns, and can encode up to 47 alphanumeric
   characters
 * Version 3 has 29 rows and 29 columns, and can encode up to 77 alphanumeric
   characters
 * ...
 * Version 40 has 177 rows and 177 columns, and can encode up to 4,296
   alphanumeric characters

Don't confuse the number of rows and columns with size of the QR code image. The
pixel size of the code is determined using chs as usual.

The API will determine which version to use, based on the amount of data you
provide.

The appropriate QR code version will be returned depending on the number of
characters you provide. For example, if you provide 55 alphanumeric characters,
you will get a Version 3 QR code, although this can change if you specify an
error correction (EC) level explicitly using the chld parameter.

Before generating your QR code, consider what kind of device is used to read
your code: the best QR code readers are able to read Version 40 codes; mobile
devices might only be able to read up to Version 4.

The following table summarizes the characteristics of a few different versions:

Version Rows x Columns EC level Maximum characters by EC level and character
type Digits: 0 to 9 Alphanumeric:
0 to 9, A to Z,
space, $ % * + - . / : Binary Kanji 1 21x21 L 41 25 17 10 M 34 20 14 8 Q 27 16
11 7 H 17 10 7 4 2 25x25 L 77 47 32 20 M 63 38 26 16 Q 48 29 20 12 H 34 20 14 8
3 29x29 L 127 77 53 32 M 101 61 42 26 Q 77 47 32 20 H 58 35 24 15 4 33x33 L 187
114 78 48 M 149 90 62 38 Q 111 67 46 28 H 82 50 34 21 10 57x57 L 652 395 271 167
M 513 311 213 131 Q 364 221 151 93 H 288 174 119 74 40 177x177 L 7,089 4,296
2,953 1,817 M 5,596 3,391 2,331 1,435 Q 3,993 2,420 1,663 1,024 H 3,057 1,852
1,273 784


FURTHER INFORMATION AND STANDARDS

The QR code standard is trademarked by Denso Wave, Inc.

The ISO sells the English language specification on their site. The Japanese
version is free.

QR code standards are approved as:

 * AIM International (Automatic Identification Manufacturers International)
   standard (ISS - QR Code) in October 1997.
 * JEIDA (Japanese Electronic Industry Development Association) standard
   (JEIDA-55) in March 1998.
 * JIS (Japanese Industrial Standards) standard (JIS X 0510) in January 1999.
 * ISO international standard (ISO/IEC18004) in June 2000.

QR code reader software is available from many sources. Google offers a QR Code
reader library, Zebra Crossing (ZXing), for free. See
http://code.google.com/p/zxing/ for details.

See Barcode Contents for a rough guide to standard encoding of information in
barcodes

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Last updated 2016-01-22 UTC.

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