Blogger is a blog publishing system. It was created by Pyra Labs, which was bought by Google in 2003. The service itself is located at www.blogger.com, and blogs that do not publish to their own websites are hosted by Google at subdomains of blogspot.com.

On August 23, 1999, Blogger was launched by Pyra Labs. As one of the earliest dedicated blog-publishing tools, it is credited for helping popularize the format.

In 2004, Google purchased Picasa; it integrated Picasa and its photo sharing utility Hello into Blogger, allowing users to post photos to their blogs. In December 2006, this new version of Blogger was taken out of beta. By May 2007, Blogger had completely moved over to Google operated servers.

As part of the Blogger redesign in 2006, all blogs associated with a user's Google Account were migrated to Google servers. Blogger claims that the service is now more reliable because of the quality of the servers. As of September 2009, Google introduced many familiar features into Blogger, including a new post-editing interface design, improved image handling.