Note: to view ant test your web browser's client-side storage, please use the "Local Storage Test" web page.
Today, almost all web browsers like Google Chrome™, Mozilla Firefox™, Opera etc. support various types of client-side storage.
|Storage Type||Default Quota||Description|
|Cookies||The limit is 4K per cookie (150-180 cookies per domain for a total of 720KB)||A cookie is a small amount of data created in the course of browsing the Web that are stored on your computer's hard drive to help facilitate certain web site functions. |
It contains information about how many times you have visited the site, how long you have been on the site, your login information, etc. Despite cookies are useful, they also pose a potential security and privacy risk. Wiki
|Local Storage||By default, the limit is 5MB-10MB per origin.||Local Storage, similar to cookies, lets a website, an extension or app to store data on your computer's hard disk. W3C, Wiki|
|Web SQL Databases||By default, the limit is 5MB-10MB per origin.||Web SQL Databases allows websites, extensions or apps to store data in a structured manner on the your computer. It useful for offline browsing. W3C, Wiki|
|IndexedDB||By default, the limit is 5MB-10MB per origin.||Some websites, extensions or apps can store data in a Indexed Database. Data in a Indexed Database is organized as a set of records. The database maintains indexes over records it stores. |
Each record consists of a key-value pair. A website can store any data in the client-side indexed database (names, credit card numbers, addresses) obtained by the site. W3C, Wiki
|File System||By default, the limit is 5MB-10MB per origin.||A website (extension, app) may use sandboxed sections of a user's local filesystem. A sanboxed section is just a subdirectory named File System in your Chrome profile directory, where data is stored in files. |
Websites can manage (create, delete, read, write) files and folders in this sandboxed subdirectory. There are a number of security and privacy issues. W3C
|Application Cache||By default, the limit is 5MB-10MB per origin.||Enables a website to work without the user being connected to the internet. A web page can provide a manifest which lists the files that are needed for the web page to work offline. |
All cached files located in a subdirectory named Application Cache in your Chrome profile directory. Application caches and cookies have similar implications with respect to privacy and security. W3C
|Flash Cookies (LSO)||By default, the limit is 100K per origin (but can be 0, 10KB, 100KB, 1MB, 10MB or even unlimited).||Flash Cookies, also called "Local Shared Objects" or "LSOs" stored as a data file on your PC. These can be used to track your browsing (for saves/ high scores / timings … whatever). Wiki|
|Silverlight Cookies||By default, the limit is 1MB per origin (an application that is taken out of the browser has its quota set to 25Mb).||Microsoft Silverlight is a technology similar to Flash. Like Flash, Silverlight maintains hidden cookies on your PC that are outside the reach of your browser's controls. Microsoft|