Opera Mini#Small-Screen Rendering

Opera Mini was derived from the Opera web browser for personal computers, which has been publicly available since 1996.{{cite web

|url=http://www.foxkeh.com/downloads/history/history-original.pdf

|title=Affiliated Organization of Firefox and Mozilla

|publisher=Mozilla Japan

|year=2006

|access-date=24 October 2007

}} Opera Mini was originally intended for use on mobile phones not capable of running a conventional Web browser.{{cite web

|url = http://operawatch.com/news/2006/05/opera-mini-20-released.html

|title = Opera Mini 2.0 Released

|last = Goldman

|first = Daniel

|work = Opera Watch

|date = 3 May 2006

|access-date = 21 December 2007

|url-status = dead

|archive-url = https://web.archive.org/web/20110721072436/http://operawatch.com/news/2006/05/opera-mini-20-released.html

|archive-date = 21 July 2011

|df = dmy-all

}} It was introduced on 10 August 2005, as a pilot project in cooperation with the Norwegian television station TV 2,{{cite press release

|url=http://www.opera.com/pressreleases/en/2005/08/10/

|title=Have WAP but want WEB? Introducing Opera Mini for mobile phones

|publisher=Opera Software

|date=10 August 2005

|access-date=5 December 2007

|archive-url=https://web.archive.org/web/20060618035344/http://www.opera.com/pressreleases/en/2005/08/10/

|archive-date=18 June 2006

|url-status=dead

}} and only available to TV 2 customers. The beta version was made available in Sweden, Denmark, Norway, and Finland on 20 October 2005.{{cite press release

|url=http://www.opera.com/pressreleases/en/2005/10/20/

|title=Mobile comfort in the cold: Opera Mini beta now available free in the Nordics

|publisher=Opera Software

|date=10 November 2005

|access-date=2 January 2008

|archive-url=https://web.archive.org/web/20080609080523/http://www.opera.com/pressreleases/en/2005/10/20/

|archive-date=9 June 2008

|url-status=dead

}} After the final version was launched in Germany on 10 November 2005,{{cite press release

|url=http://www.opera.com/pressreleases/en/2005/11/10/

|title=The full Internet for all mobile phones: Opera Mini launched in India

|publisher=Opera Software

|date=10 November 2005

|access-date=2 January 2008

|archive-url=https://web.archive.org/web/20081006230846/http://opera.com/pressreleases/en/2005/11/10/

|archive-date=6 October 2008

|url-status=dead

}} and quietly released to all countries through the Opera Mini website in December, the browser was officially launched worldwide on 24 January 2006.{{Cite news |last=Gohring |first=Nancy |date=25 January 2006 |title=Opera to launch Mini worldwide |work=PC World |publisher=IDG |url=https://www.pcworld.idg.com.au/article/148961/opera_launch_mini_worldwide/ |access-date=14 November 2022 |archive-date=14 November 2022 |archive-url=https://web.archive.org/web/20221114014131/https://www.pcworld.idg.com.au/article/148961/opera_launch_mini_worldwide/ |url-status=dead }}

On 3 May 2006, Opera Mini 2.0 was released. It included new features such as the ability to download files, new custom skins, more search engine options on the built-in search bar, a speed dial option, new search engines, and improved navigation.{{cite press release

|url=http://www.opera.com/pressreleases/en/2006/05/03/

|title=Mini Gets Mighty: Introducing Opera Mini 2.0 for your mobile phone

|publisher=Opera Software

|date=3 May 2006

|access-date=21 December 2007

|archive-url=https://web.archive.org/web/20081006222856/http://opera.com/pressreleases/en/2006/05/03/

|archive-date=6 October 2008

|url-status=dead

}}

On 1 November 2006, Opera Mini 3 beta introduced secure browsing, RSS feeds, photo uploading and content folding.{{cite web

|url = http://operawatch.com/news/2006/11/limited-testing-of-opera-mini-3-beta.html

|title = Limited testing of Opera Mini 3 beta

|last = Goldman

|first = Daniel

|work = Opera Watch

|date = 1 November 2006

|access-date = 21 December 2007

|url-status = dead

|archive-url = https://web.archive.org/web/20110721072456/http://operawatch.com/news/2006/11/limited-testing-of-opera-mini-3-beta.html

|archive-date = 21 July 2011

|df = dmy-all

}} Content folding works by folding long lists such as navigation bars into a single line that can be expanded as needed. A second beta was released on 22 November,{{cite web

|url=http://my.opera.com/operamini/blog/2006/11/22/opera-mini-3-0-beta-2

|title=Opera Mini 3.0 Beta 2

|last=Spilling

|first=Marianne

|publisher=Opera Software

|date=22 November 2006

|access-date=21 December 2007

}} and on 28 November, the final version of Opera Mini 3 was released.{{cite press release

|url=http://www.opera.com/pressreleases/en/2006/11/28/

|title=Opera Mini drives social networking on mobile phones

|publisher=Opera Software

|date=28 November 2006

|access-date=21 December 2007

|archive-url=https://web.archive.org/web/20080513185056/http://www.opera.com/pressreleases/en/2006/11/28/

|archive-date=13 May 2008

|url-status=dead

}}

On 7 November 2007, Opera Mini 4 was released. According to Johan Schön, technical lead of Opera Mini development, the entire code had been rewritten. Opera Mini 4 includes the ability to view web pages similarly to a desktop based browser by introducing Overview and Zoom functions, and a landscape view setting. In Overview mode, the user can scroll a zoomed-out version of certain web pages.{{cite web |url=http://www.opera.com/mini/features/? |title=Opera Mini Features |publisher=Opera Software |date=February 2009 |access-date=13 July 2014 |url-status=dead |archive-url=https://web.archive.org/web/20090227222446/http://www.opera.com/mini/features/ |archive-date=27 February 2009 |df=dmy-all }} Using a built-in pointer, the user can zoom into a portion of the page to provide a clearer view; this is similar to the functionality of Opera's Nintendo-based web browsers. This version also includes the ability to synchronise with Opera on a personal computer.Calore, Michael "[http://blog.wired.com/monkeybites/2007/06/opera_mini_4_be.html Opera 4 Beta Released] {{webarchive|url=https://web.archive.org/web/20070630071814/http://blog.wired.com/monkeybites/2007/06/opera_mini_4_be.html |date=30 June 2007 }}", Wired News, 19 June 2007Heater, Brian "[http://www.appscout.com/2007/11/opera_mini_4_goes_live.php Opera Mini 4 Goes Live] {{Webarchive|url=https://web.archive.org/web/20080828033804/http://www.appscout.com/2007/11/opera_mini_4_goes_live.php |date=28 August 2008 }}", AppScout (Ziff Davis), 7 November 2007

Prior to Opera Mini 4, the browser was offered in two editions: Opera Mini Advanced for high-memory MIDP 2 phones, and Opera Mini Basic for low-memory MIDP 1 phones.{{cite web

|url=http://www.operamini.com/help/faq/#version

|title=Opera Mini FAQ

|at=What are the differences between the "Basic (MIDP 1)" and the "Advanced (MIDP 2)" versions?

|publisher=Opera Software

|archive-url=https://web.archive.org/web/20071219001957/http://www.operamini.com/help/faq/#version

|archive-date=19 December 2007

|url-status=usurped

}} Opera Mini 4 replaced Opera Mini Advanced.{{cite web

|url = http://www.operamini.com/download/pc/generic/generic_advanced_midp_2/

|title = Generic Advanced MIDP 2

|work = Download Opera Mini

|publisher = Opera Software

|access-date = 19 December 2007

|archive-url = https://web.archive.org/web/20071011001837/http://www.operamini.com/download/pc/generic/generic_advanced_midp_2/

|archive-date = 11 October 2007

|url-status = dead

|df = dmy-all

}} Originally, Google was the default search engine on Opera Mini.{{cite news

|url = http://today.reuters.com/news/articlebusiness.aspx?type=technology&storyID=nL29549259

|title = Opera Software chooses Google as search partner

|publisher = Reuters

|date = 28 December 2005

|access-date = 11 October 2007

|archive-url = https://web.archive.org/web/20070906181131/http://today.reuters.com/news/articlebusiness.aspx?type=technology

|archive-date = 6 September 2007

|url-status = dead

|df = dmy-all

}} On 8 January 2007, Opera Software and Yahoo! announced a partnership to make Yahoo! search the default instead.{{cite press release

|url = http://yhoo.client.shareholder.com/press/ReleaseDetail.cfm?ReleaseID=224622

|title = Opera Names Yahoo! Exclusive Global Partner for Mobile Search

|publisher = Yahoo!

|access-date = 11 October 2007

|url-status = dead

|archive-url = https://web.archive.org/web/20071013201115/http://yhoo.client.shareholder.com/press/ReleaseDetail.cfm?ReleaseID=224622

|archive-date = 13 October 2007

|df = dmy-all

}} On 27 February 2008, Opera Software announced that Google would henceforth be the default search engine for Opera Mini and Opera Mobile.

A version for the Android operating system was announced on 10 April 2008. Rather than port the code to Android, a wrapper was created to translate Java ME API calls to Android API calls.{{cite web

|url=http://labs.opera.com/news/2008/04/10/

|archive-url=https://web.archive.org/web/20080411231636/http://labs.opera.com/news/2008/04/10/

|archive-date=11 April 2008

|title=The story behind Opera Mini on Google Android

|access-date=4 January 2009}}

On 16 August 2009, Opera Software released Opera Mini 5.0 beta, which included tabbed browsing, a password manager, improved touch screen support, and a new interface, with a visual Speed Dial similar to the one introduced by Opera Software in their desktop browser.{{Cite web |url=http://www.opera.com/press/releases/2009/09/16/ |title=Global mobile-browser champion enters next generation |access-date=14 November 2009 |archive-url=https://web.archive.org/web/20120309091100/http://www.opera.com/press/releases/2009/09/16/ |archive-date=9 March 2012 |url-status=dead }}

The browser's use of compression and encrypted proxy-based technology to reduce traffic and speed page display has the side effect of allowing it to circumvent several approaches to Internet censorship. Since 20 November 2009, there have been reports from Chinese users that when they use Opera Mini, they are redirected to an error page leading them to download Opera Mini China version. This is almost certainly due to the Chinese government being concerned that users are using Opera Mini to bypass the Great Firewall of China. Opera agreed to route all of their traffic through government servers.{{cite web

|url=http://internet.solidot.org/article.pl?sid=09/11/21/0456204

|title=Opera Mini国际版屏蔽国内用户

|publisher=Solidot

|language=zh

|date=21 November 2009

|access-date=25 November 2009

}}{{cite web|title=Opera accused of censorship, betrayal by Chinese users|work=CNet Asia|first=Steven|last=Millward|date=22 November 2009|url=http://asia.cnet.com/blogs/opera-accused-of-censorship-betrayal-by-chinese-users-62115913.htm|url-status=dead|archive-url=https://web.archive.org/web/20131103151615/http://asia.cnet.com/blogs/opera-accused-of-censorship-betrayal-by-chinese-users-62115913.htm|archive-date=3 November 2013|df=dmy-all}}

In 2009–10: A press release announcing that Indonesia's Smart Telecom had chosen Opera Mini for their devices said that Opera Mini was the world's most popular mobile browser, and that Russia and Indonesia were the largest users.{{cite web |url=http://www.mobile-fun.org/reviews/category/indonesia/ |title=Mobile Phone Reviews » indonesia |access-date=2010-11-15 |url-status=dead |archive-url=https://web.archive.org/web/20100329155422/http://www.mobile-fun.org/reviews/category/indonesia/ |archive-date=29 March 2010 |df=dmy-all }}

An iPhone version was approved for distribution by the Apple App Store on 13 April 2010.{{Cite web|url=https://gizmodo.com/opera-mini-submitted-to-app-store-complete-with-passiv-5500165|title=Opera Mini Submitted to App Store, Complete with Passive Aggressive "Countup" Clock|website=Gizmodo|date=23 March 2010 }}{{cite web |url=http://www.opera.com/press/releases/2010/04/13/ |title=Opera Mini Approved for App Store |access-date=13 April 2010 |archive-url=https://web.archive.org/web/20101015040646/http://www.opera.com/press/releases/2010/04/13/ |archive-date=15 October 2010 |url-status=dead }}

On 3 September 2014, Opera started taking registrations for the beta version of Opera Mini for Windows Phone.{{Cite web|url=https://www.techtree.com/content/news/7331/opera-mini-beta-subscriptions-open-windows-phone.html|title=Opera Mini Beta Subscriptions Now Open For Windows Phone|website=TechTree.com}} The browser was released for Windows Phone on 9 September 2014, as a public beta,{{Cite web|url=http://blog.gsmarena.com/opera-mini-beta-windows-phone-now-available-anyone-test/|title=Opera Mini beta for Windows Phone now available for anyone to test|website=blog.gsmarena.com|date=9 September 2014 }} the first Opera version for Microsoft's mobile platform since the discontinuation of Windows Mobile.

Opera Mini uses a server to translate HTML, CSS and JavaScript into a more compact format. It can also shrink any images to fit as the handset screen. This step makes Opera Mini fast.

Most Opera Mini versions use only the server-based compression method, with maximal compression but some issues with interactive web apps. Opera Mini can operate in three compression modes: "mini" (or "extreme" on Android versions), "turbo" (or "high" on Android versions) and uncompressed. The turbo and mini modes reduce the amount of data transferred, thereby also increasing speed on slower connections.

The functionality of the Mini mode is somewhat different from a conventional Web browser, with the amount of data which has to be transferred much reduced, but with some loss to functionality. Unlike straightforward web browsers, Opera Mini fetches all content through a proxy server, renders it using the Presto layout engine, and reformats web pages into a format more suitable for small screens.{{cite web

|url = http://developer.sonyericsson.com/wportal/devworld/page-not-found?cc=gb&lc=en

|title = Developer case study:

Managing Java fragmentation, Opera Software's Java ME browser client: About Opera Mini

|publisher = Sony Ericsson

|date = 23 June 2006

|access-date = 19 December 2007

|url-status = dead

|archive-url = https://web.archive.org/web/20110804045050/http://developer.sonyericsson.com/wportal/devworld/page-not-found?cc=gb&lc=en

|archive-date = 4 August 2011

|df = dmy-all

}} A page is compressed, then delivered to the phone in an interpreted markup language called Opera Binary Markup Language (OBML) supported by Opera Mini.{{cite web

|url=http://www.opera.com/company/investors/finance/2005/3Q05_presentation.pdf

|title=Opera 3Q05 Results

|page=16

|date=21 November 2005

|access-date=19 December 2007

|archive-url=https://web.archive.org/web/20051201033011/http://www.opera.com/company/investors/finance/2005/3Q05_presentation.pdf

|archive-date=1 December 2005

}} According to Opera Software, the data compression makes transfers about two to three times faster and uses less data, and the pre-processing improves the display of web pages not designed for small screens.{{cite news

|url = http://news.digitaltrends.com/news/story/9372/opera_mini_officially_brings_web_to_mobiles

|archive-url = https://archive.today/20080607011142/http://news.digitaltrends.com/news/story/9372/opera_mini_officially_brings_web_to_mobiles

|url-status = dead

|archive-date = 7 June 2008

|title = Opera Mini Officially Brings Web to Mobiles

|last = Duncan

|first = Geoff

|publisher = Digital Trends News

|date = 24 January 2006

|access-date = 18 October 2007

}} The turbo mode was added later, and is similar to Mini mode but bypasses compression for interactive functionality, at the expense of less extreme data compression. The turbo and uncompressed modes use the "WebView" on Android and the WebKit layout engine on iOS.

The Java ME and Windows Phone versions only have access to the mini compression mode.{{Cite web|url=https://dev.opera.com/articles/browsers-modes-engines/|title=Opera Browsers, Modes & Engines|last=Bovens|first=Andreas|date=2 June 2015|website=Dev.Opera|access-date=13 August 2017}} Other versions can switch between various modes, gaining functionality at the cost of lower or no compression.{{Cite web|url=http://dev.opera.com/blog/opera-mini-8-for-ios/|title=Opera Mini 8 for iOS released|last=Lawson|first=Bruce|date=26 June 2014|website=Dev.Opera|publisher=Opera Software}} Opera Software claims that Opera Mini reduced the amount of data transmitted up to 90% in the mini (extreme) mode; in turbo (high) mode, it reduced amount up to 60%, similar to Google Chrome's Reduced Data mode.{{Cite news|url=https://www.geek.com/android/opera-mini-now-has-two-compression-modes-high-and-extreme-1633537/|title=Opera Mini now has two compression modes: high and extreme|last=Mathews|first=Lee|date=9 September 2015|work=Geek.com|publisher=Ziff Davis|access-date=13 August 2017|archive-date=13 August 2017|archive-url=https://web.archive.org/web/20170813183932/https://www.geek.com/android/opera-mini-now-has-two-compression-modes-high-and-extreme-1633537/|url-status=dead}}{{Cite news|url=https://thenextweb.com/apps/2015/09/08/opera-mini-browser-for-android-now-lets-you-choose-between-speed-and-experience-while-saving-data/undefined/apps/2015/09/08/opera-mini-browser-for-android-now-lets-you-choose-between-speed-and-experience-while-saving-data/|title=Opera Mini browser (Android) has a new data saving mode|last=Ghoshal|first=Abhimanyu|date=8 September 2015|work=The Next Web|access-date=13 August 2017|archive-date=13 August 2017|archive-url=https://web.archive.org/web/20170813185853/https://thenextweb.com/apps/2015/09/08/opera-mini-browser-for-android-now-lets-you-choose-between-speed-and-experience-while-saving-data/undefined/apps/2015/09/08/opera-mini-browser-for-android-now-lets-you-choose-between-speed-and-experience-while-saving-data/|url-status=dead}}{{cite web |url=http://www.makeuseof.com/tag/is-opera-minis-data-compression-good-enough-to-switch/ |title=Is Opera Mini's Data Compression Good Enough to Switch? |website=Makeuseof.com |date=11 September 2015|author=Mihir Patkar|access-date= 18 March 2017}}

File:Opera mini.png When a user requests a Web page using Opera Mini, the request is sent, via the connectivity used by the device to access the Internet (typically mobile broadband or Wi-Fi), to a proxy server run by the Opera Software company, which retrieves, processes and compresses the full page, and sends the smaller processed page back to the client's device.

By default, Opera Mini opens one connection to the proxy servers, which it keeps open and re-uses as required. This improves transfer speed and enables the servers to quickly synchronize changes to bookmarks stored in Opera Mini server.{{sfn|FAQ|loc=What is the difference between ‘http connection' and ‘socket connection'?}}

When the Opera Software company launched Opera Mini in 2006, they had over 100 Linux-based proxy servers to handle Opera Mini traffic.

From 16 March 2015, Opera Mini's extreme compression mode uses an upgraded version of the Presto layout engine that is included in Opera 12.{{cite web

|url=https://dev.opera.com/blog/opera-mini-server-upgrade/

|title=Opera Mini server upgrade

|website=Dev.Opera

|last=Lawson

|first=Bruce

|date=16 March 2015

|access-date=12 May 2017

}} Consequently, Opera Mini supports most of the web standards supported in Opera 12. Presto's development has continued for Opera Mini and further support was added for HTML5 input types, CSS Flexbox model, CSS rem units and ECMAScript 5. However, unlike the desktop edition of Opera, frames are flattened because of client limitations, and dotted or dashed borders are displayed as solid borders due to bandwidth and memory issues. As Opera Mini reformats web pages, it does not pass the Acid2 standards compliance test.{{cite web

|url=http://virtuelvis.com/archives/2007/06/opera-mini-4-beta

|title=Opera Mini 4 beta out

|date=June 2007

|access-date=22 December 2007

|archive-date=10 October 2011

|archive-url=https://web.archive.org/web/20111010083936/http://virtuelvis.com/archives/2007/06/opera-mini-4-beta

|url-status=dead

}}{{cite web

|url=http://www.opera.com/mini/demo/

|title=Opera Mini Simulator

|website=Opera.com

|publisher=Opera Software

|access-date=22 December 2007

|archive-url=https://web.archive.org/web/20100209050824/http://www.opera.com/mini/demo/

|archive-date=9 February 2010

|url-status=dead

}} Opera Mini supports bi-directional text and can correctly display right-to-left scripts such as Arabic and Hebrew in addition to languages written left-to-right. However, it will not display right-to-left text if the font size is set to small or very small.{{cite web

|url=http://my.opera.com/operamini/blog/

|title=The power of the Web with Opera Mini 4

|website=My.Opera.com

|last=Schön

|first=Johan

|date=7 November 2007

|access-date=24 December 2007

}} Indic and Chinese scripts are supported only if an appropriate font is installed on the device as the default system font.

For devices with screens 128 pixels wide or smaller, the default rendering mode is Small-Screen Rendering (SSR). In this mode, the page is reformatted into a single vertical column so that it only needs to be scrolled vertically. Long lists and navigation bars are automatically collapsed (hiding most of the list or bar) by a feature known as "content folding". A plus (+) sign is displayed next to the collapsed content; when clicked, it toggles content folding.{{cite web

|url=http://www.operamini.com/features/folding/

|title=Content folding

|publisher=Opera Software

|work=Opera Mini Features

|access-date=4 January 2008

}} Web developers can turn on SSR on the desktop edition of Opera to see how their websites will be displayed on mobile editions of Opera.{{cite web

|url=http://www.opera.com/products/mobile/smallscreen/

|title=Opera's Small-Screen Rendering

|publisher=Opera Software

|access-date=20 December 2007

|archive-url = https://web.archive.org/web/20071204034833/http://www.opera.com/products/mobile/smallscreen/ |archive-date = 4 December 2007}} In SSR mode images are scaled down to no more than 70% of the screen size in either direction.{{cite web

|url = http://dev.opera.com/articles/view/evolving-the-internet-on-your-phone-des/

|title = Evolving the Internet on your phone: Designing web sites with Opera Mini 4 in mind

|last = Storey

|first = David

|publisher = Opera Software

|date = 31 August 2007

|access-date = 16 January 2008

|url-status = dead

|archive-url = https://web.archive.org/web/20110810045958/http://dev.opera.com/articles/view/evolving-the-internet-on-your-phone-des/

|archive-date = 10 August 2011

|df = dmy-all

}}

Opera Mini can send content in bitmap image form if a font required is not available on the device, which is useful for indic scripts. Hindi, Bengali and a few other non-Latin character sets are supported.

When browsing the Web in Opera Mini mode, JavaScript is processed by the proxy server, and is merely rendered on the device. This limits interactivity. Scripts cannot be run in the background on the device. If a script is paused (on the server), the browser must communicate with the server to unpause it. JavaScript will only run for a couple of seconds on the Mini server before pausing, due to resource constraints.{{Cite web|url=https://dev.opera.com/articles/opera-mini-content-authoring-guidelines/|title=Dev.Opera — Opera Mini: Web Content Authoring Guidelines|website=dev.opera.com|date=20 November 2024 }} On Opera Mini, before the page is sent to the mobile device, its onLoad events are fired and all scripts are allowed a maximum of two seconds to execute. The setInterval and setTimeout functions are disabled, so scripts designed to wait a certain amount of time before executing will not execute.{{cite web

|url = http://dev.opera.com/articles/view/javascript-support-in-opera-mini-4/

|title = JavaScript support in Opera Mini 4 (deprecated article)

|last = Mills

|first = Chris

|publisher = Opera Software

|date = 25 October 2007

|access-date = 29 December 2007

|url-status = dead

|archive-url = https://web.archive.org/web/20110729014403/http://dev.opera.com/articles/view/javascript-support-in-opera-mini-4/

|archive-date = 29 July 2011

|df = dmy-all

}} After the scripts have finished or the timeout is reached, all scripts are stopped and the page is compressed and sent to the mobile device. Once on the device, only a handful of events are allowed to trigger scripts:

• onUnload: Fires when the user navigates away from a page{{cite web |url=http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-eventgroupings-htmlevents |title=HTML event types |work=Document Object Model (DOM) Level 2 Events Specification |date=13 November 2000 |access-date=29 December 2007}}
• onSubmit: Fires when a form is submitted
• onChange: Fires when the value of an input control is changed
• onClick: Fires when an element is clicked

When one of these events is triggered, it sends a request to the proxy server to process the event. The proxy server then executes the JavaScript and returns the revised page to the mobile device. Pop-ups, if not blocked by the JavaScript restrictions, replace the web page being viewed.{{cite web

|url = http://dev.opera.com/articles/view/designing-with-opera-mini-in-mind/

|title = Designing With Opera Mini in Mind

|publisher = Opera Software

|date = 13 November 2006

|access-date = 31 December 2007

|url-status = dead

|archive-url = https://web.archive.org/web/20110804071149/http://dev.opera.com/articles/view/designing-with-opera-mini-in-mind/

|archive-date = 4 August 2011

|df = dmy-all

}} Opera has published Web content authoring guidelines to assist authors.

Opera Mini can run in Turbo and Uncompressed modes, in addition to Mini mode. In Turbo mode, the amount of data transferred is still much reduced by compression, but, unlike Mini mode, JavaScript is not intercepted by the server and works properly. Opera Mini can be configured to choose compression mode automatically.

Opera Mini encrypts the connection between the mobile device and the Opera proxy server for security. The encryption key is obtained on the first start by requesting random keys a certain number of times.{{cite web

|url=http://www.operamini.com/help/faq/#key

|title=Opera Mini FAQ

|at=What is the purpose of the screen where you need to press keys until the indicator is full?

|publisher=Opera Software

|url-status=usurped

|archive-url=https://web.archive.org/web/20071219211629/http://www.operamini.com/help/faq/#settings

|archive-date=19 December 2007

}} Opera Mini supports most advanced version of Transport Layer Security (TLS) protocol{{Cite web|url=https://www.ssllabs.com/ssltest/viewMyClient.html|title=Qualys SSL Labs - Projects / SSL Client Test}}

it also supports modern secure ciphers such as AES-GCM and ECC.

However, Opera Mini's Extreme mode does not offer true end-to-end security when visiting HTTPS encrypted websites only for data saving purpose.{{cite web

|url=http://brandonmcgee.blogspot.com/2007/10/recommendation-for-mobile-banking.html

|title=Recommendation for Mobile Banking Vendors & An Update on Opera Browsers

|first=Brandon

|last=McGee

|date=14 October 2007

|access-date=8 August 2017

}} With "Extreme/Mini mode" when visiting an encrypted web page, first the Opera Mini's servers decrypt the page, compress it for data saving then re-encrypt it themselves and finally forward it to the destination phone.{{sfn|FAQ|loc=How does encryption work in Opera Mini?}}

While browsing a secured site with "High/Turbo mode" or "Uncompressed mode" the connection is not intercepted by the Opera Mini server so that High and Uncompressed modes do not break end-to-end integrity.{{Cite web|url=https://opera.com/turbo|title = Opera Mini for Android | Ad blocker, File sharing, Data savings | Opera}}

Opera Mini uses cloud acceleration and data compression technology. Opera Mini servers act as a proxy which compresses and renders the data of web pages before sending it to users. This process helps to load web content faster.

The display may be toggled between portrait and landscape mode by keystrokes, or will switch automatically on phones with orientation sensors. The default orientation can be changed.

The image quality may be set to "Low", "Medium", or "High". Load times of pages with images are affected by the chosen image quality setting.{{cite web

|url = http://operawatch.com/news/2007/08/how-to-get-higher-quality-images-with-opera-mini.html

|title = How to get higher quality images with Opera Mini?

|last = Goldman

|first = Daniel

|work = Opera Watch

|date = 15 August 2007

|access-date = 4 January 2008

|archive-url = https://web.archive.org/web/20080113213108/http://operawatch.com/news/2007/08/how-to-get-higher-quality-images-with-opera-mini.html

|archive-date = 13 January 2008

|url-status = dead

|df = dmy-all

}}

Opera Mini supports only one font, which can be set to "Small", "Medium", or "Large" size.{{cite web

|url=http://www.opera.com/mini/demo/

|title=Opera Mini Simulator

|publisher=Opera Software

|work=Opera Mini Features

|access-date=4 January 2008

|archive-url=https://web.archive.org/web/20100209050824/http://www.opera.com/mini/demo/

|archive-date=9 February 2010

|url-status=dead

}} If a web page uses Courier or a generic monospaced font, the one font is still used, but the characters are spaced out so that each character takes up the same amount of space.

Opera Mini's address bar is capable of using several pre-configured search engines. The user can add more search engines. The default search engines are Google and Wikipedia.

Opera Mini supports an ad blocker. When activated, Opera Mini servers try to filter out advertisement before rendering the page and sending it to the client phone.{{Cite web|url=https://forums.opera.com/topic/14993/opera-mini-16-for-android|title=Opera Mini 16 for Android|date=May 4, 2016|website=Opera forums}}

Opera Mini has an AI-powered news aggregator, serving personalised news,{{Cite web|url=https://blogs.opera.com/mobile/2017/09/revamping-opera-mini-for-ios-16/|title = Revamping Opera Mini for IOS|date = 5 September 2017}} night mode and private browsing. It can save bookmarks, download files, and web pages for offline reading. It supports streaming and remembers the user's browsing history.

If signed into an Opera Account, Saved Bookmarks, Speed Dials, Opened Tabs can be backed up and synchronized between different phones or with the Opera browser on computers, using the "Opera Sync" service, and can be accessed through web interface at [https://sync.opera.com/web/ Opera synchronization].

The overall share of the Opera family in the mobile Web browser market was about 5.01% in June 2018.{{cite web

|url=http://gs.statcounter.com/browser-market-share/mobile/worldwide/#monthly-201709-201709-bar

|title=Browser Market Share Worldwide

|publisher=StatCounter

|date=July 2017

|access-date=1 July 2017

}}

File:Total data consumed by Opera Mini users worldwide (TB).png

Opera Mini relies on data centers processing the Web page before sending it back to the phone in a compressed binary form. Opera Software operates data centers in the United States, Norway, China, Korea, Poland and Iceland.{{Cite web|url=http://www.operasoftware.com/press/releases/mobile/opera-slashes-power-usage-with-new-server-parks|title=Opera slashes power usage with new server parks|date=24 June 2010|website=Opera b2b|publisher=Opera Software|location=Oslo, Norway}}{{cite web|url=http://www.operasoftware.com/press/releases/mobile/serving-up-more-opera-mini-in-europe-opera-opens-new-data-center-in-poland|title=Serving up more Opera Mini in Europe: Opera opens new data center in Poland|date=30 June 2009|website=Opera b2b|publisher=Opera Software|location=Oslo, Norway}}

Several mobile network companies pre-install Opera Mini on their mobile phones, including Telenor, AT&T, Vodafone, T-Mobile, KDDI, Omnitel, Pannon GSM, Telefónica Móviles de España and TMN.

{{Update |section|date=June 2023}}

The following devices were supplied pre-installed with Opera Mini {{As of|2007|8|lc=on}}. Some listed devices only included Opera Mini when bought from certain network operators.{{cite web

|url = http://operawatch.com/news/2007/08/phones-with-opera-mini-pre-installed.html

|title = Phones with Opera Mini pre-installed, distribution partners, and more

|last = Goldman

|first = Daniel

|work = Opera Watch

|date = 27 August 2007

|access-date = 5 February 2008

|url-status = dead

|archive-url = https://web.archive.org/web/20110717145437/http://operawatch.com/news/2007/08/phones-with-opera-mini-pre-installed.html

|archive-date = 17 July 2011

|df = dmy-all

}}

• Motorola V980, E2, L7, i1{{cite press release

|url=http://mediacenter.motorola.com/content/detail.aspx?ReleaseID=12556&NewsAreaId=2

|title=Motorola and Sprint Announce World's First Push-To-Talk Android-Powered Smartphone – Motorola i1

|publisher=Motorola

|date=22 March 2010

|access-date=22 March 2010

}}

• Nokia Nokia Asha series, 2610, 2700 classic, 2730 classic, 3110 classic, 3120 classic, 3500 classic, 3600, 3600 slide, 3710 fold, 3720 classic, 5000, 5070, 5130, 5230, 5310, 5500 Sport, 5610, 6080, 6085, 6103, 6131, 6233, 6288, 6300,{{cite press release |title=Opera Mini Web browser pre-installed with Nokia 6300 |publisher=Opera Software |date=14 December 2006 |url= http://www.operasoftware.com/press/releases/devices/opera-minia-web-browser-pre-installed-with-nokia-6300 |access-date=1 December 2013}} 6303 classic, 6600 slide, 7373, 8800 Arte, Nokia C2-01, Nokia C3, E65, N71, N73, N95 and other S40 and S60 phones.
• Microsoft and HMD Nokia/HMD phones with a preinstalled browser and running s30+ all run on the Opera Mini Browser,{{Cite web |title=Nokia Corporation |url=https://www.nokia.com/ |access-date=2023-09-24 |website=www.nokia.com}} along with 3310 (2017) that run Smart Feature OS for 3G version.
• Sony Ericsson K310i, K530i, K550, W200i, W205, W760i, W910i, Z530i, Z550i, Z780i
• Samsung X160, E570, E420, F480, X510, X650, E900, E250, U700, ZV60, D900i
• LG K880, KU250, KE970, and KU311
• SAGEM My411x and P9521
• BenQ-Siemens EL71 and EF81
• BenQ E71 fight
• Orange Rio (ZTE-G X991)

While not officially supported on ChromeOS, Vlad Filippov published a guide that teaches how to run Opera Mini inside the Chromium browser.{{Cite web|url=https://dev.opera.com/articles/opera-mini-chrome-os/|title=Dev.Opera — Opera Mini on your Chromebook for fun and bandwidth|website=dev.opera.com|date=20 November 2024 }}

• Opera (web browser)
• Opera Mobile
• UC Browser, a server-based compressing browsing system
• Bolt (web browser), a discontinued server-based compressing browsing system
• History of the web browser
• List of web browsers

{{Reflist}}

{{commons category|Opera Mini}}

• {{Official website}}

{{OperaBrowser|state=uncollapsed}}

{{Web browsers}}

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