The Opera browser was begun by Telenor, the leading Norwegian telecom company, in early 1994. In 1995, Opera was split off into a separate company, Opera Software SA, which remained in Norwegian hands until mid-2016, when the entire Opera browser business was for $600 million, leaving the parent company with Opera Apps & Games and Opera TV. Opera 1.0 was an in-house project to demonstrate that Telenor’s programmers were capable of creating a compliant browser. The project began in April 1994 with version 1.0 completed in April 1995. Opera developed its own engine to render web pages. Opera 2.0 was finalized one year later, in April 1996, and the software was released as shareware, but it wasn’t until version 2.1 that Opera was officially released.

This version introduced full page scaling, allowing the user to zoom from 20% to 1000%. It was the first version available for Macs. Opera 3.0 was released in December 1997 and was the first version with JavaScript. Opera 3.5 used the Elektra rendering engine and added Java support via plug-in. It was the first version to support Cascading Style Sheets (CSS). Version 3.6 (May 1999) improved CSS, HTML, and JavaScript, along with faster rendering of JPEG and GIF images. Version 3.6 was the last to support 16-bit Windows 3.x.

A beta known as Opera 3.65 was developed for BeOS and released on July 29, 1999. Opera 4.0 was the first to require Windows 95 or newer when it was released in June 2000.

It gained tabbed browsing and had support for both XML and Dynamic HTML. Best app games for two players. With version 4.0, Opera began using a cross-platform core. Opera 5, released at the end of 2000, was ad-supported instead of being shareware with a free trial period. Mac requirements are System 7.5.3 through 9.2.x (there is no native Mac OS X support, but it will run in Classic Mode with OS X 10.4.11 and earlier).

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The installer notes that Unicode and Full Screen View are not supported. Version 5.1 added mouse gestures in April 2001. With version 6 in November 2001, Opera gained Unicode capabilities as well as PNG alpha-channel transparency. Mac requirements include a PowerPC Mac and Mac OS 8.6 through – the first Opera release for Mac OS X. Version 6.1 was the first Opera version available for FreeBSD. With Opera 7.0, the browser moved to the Presto rendering engine in January 2003.

Opera 7.0 was the first version to require Mac OS X, dropping support for the Classic Mac OS. Version 7.3 introduced voice capabilities. Version 7.5 added support for RSS news readers. Opera 8.0 (April 2005) added Scalable Vector Graphics (SVG) support, and version 8.5 dropped ads as Opera became a truly free browser. Opera 9 (June 2006) gained widgets and was the first to pass the Acid2 test, 9.1 added fraud protection, and 9.2 got Speed Dial, a launch page with thumbnails. In September 2009, version 10 arrived with speed optimizations and web font support, and 10.5 had an improved JavaScript engine. Opera 10.6 was about 50% faster and is the last version to support PowerPC Macs.