Secret keys may be encoded in QR codes as a URI with the following format:
Examples
Provision a TOTP key for user
[email protected]
, to use with a service provided by Example, Inc:QR Code API Documentation. QR Code encoder and decoder API. Generate QRCode for phone and sms numbers, skype user names, email, business card(V CARD) or plain text. Upload QR Code images and get back the decoded text. All in one simple easy to use REST API. May 20, 2014 Producing printable QR codes for persistent storage of GPG private keys - gpg2qrcodes.sh. Free Online QR Code Generator to make your own QR Codes. Supports Dynamic Codes, Tracking, Analytics, Free text, vCards and more.
This Base32 encoded key 'JBSWY3DPEHPK3PXP' has the value:
Here's another example with all optional parameters supplied
Live Demo
Try Browser Authenticator Demo, source at https://git.coolaj86.com/coolaj86/browser-authenticator.js
2FA QR code generator Save your 2FA secrets, then use this to scan them again. This is a 2FA QR code generator made in JavaScript that helps you make QR codes from 2FA secrets.
Valid types are
hotp
and totp
, to distinguish whether the key will be usedfor counter-based HOTP or for TOTP.The label is used to identify which account a key is associated with. It contains an accountname, which is a URI-encoded string, optionally prefixed by an issuer string identifyingthe provider or service managing that account. This issuer prefix can be used to preventcollisions between different accounts with different providers that might be identifiedusing the same account name, e.g. the user's email address.
The issuer prefix and account name should be separated by a literal or url-encoded colon,and optional spaces may precede the account name. Neither issuer nor account name maythemselves contain a colon. Represented in ABNF according to RFC 5234:
Valid values might include
Example:[email protected]
, Provider1:Alice%20Smith
orBig%20Corporation%3A%20alice%40bigco.com
.We recommend using both an issuer label prefix and an issuer parameter, described below.
Secret
REQUIRED: The
secret
parameter is an arbitrary key value encoded in Base32according to RFC 3548. The padding specifiedin RFC 3548 section 2.2 is notrequired and should be omitted.Issuer
STRONGLY RECOMMENDED: The
issuer
parameter is a string value indicatingthe provider or service this account is associated with, URL-encoded according toRFC 3986. If the issuer parameter is absent,issuer information may be taken from the issuer prefix of the label. If both issuerparameter and issuer label prefix are present, they should be equal.Valid values corresponding to the label prefix examples above would be:
issuer=Example
,issuer=Provider1
, and issuer=Big%20Corporation
.Older Google Authenticator implementations ignore the issuer parameter and rely uponthe issuer label prefix to disambiguate accounts. Newer implementations will use theissuer parameter for internal disambiguation, it will not be displayed to the user.We recommend using both issuer label prefix and issuer parameter together to safelysupport both old and new Google Authenticator versions.
Algorithm
OPTIONAL: The
algorithm
may have the values:- SHA1 (Default)
- SHA256
- SHA512
Currently, the algorithm parameter is ignored by the Google Authenticator implementations.
Digits
OPTIONAL: The
digits
parameter may have the values 6 or 8, and determines howlong of a one-time passcode to display to the user. The default is 6.Currently, on Android and Blackberry the digits parameter is ignored by the Google Authenticator implementation.
Counter
REQUIRED if
type
is hotp
: The counter
parameter is required when provisioninga key for use with HOTP. It will set the initial counter value.Period
OPTIONAL only if
type
is totp
: The period
parameter defines a period that aTOTP code will be valid for, in seconds. The default value is 30.Currently, the period parameter is ignored by the Google Authenticator implementations.
Warning: This API is deprecated. Please use the actively maintained Google Charts API instead. See our deprecation policy for details.
You can create a QR code on the fly with a URL GET request.
Api Key For Yahoo Weather
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?
Microsoft Qr Code Generator Api
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:
|
chld=<error_correction_level>|<margin> | Optional |
|
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.
![Generate Qr Code Api Key Secret Generate Qr Code Api Key Secret](/uploads/1/2/6/0/126048720/506351325.png)
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
Api Key Yahoo
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