KPIX-TV first signed on the air on December 22, 1948, as a primary CBS affiliate.
The logo design, especially the font (called "Westinghouse" or "Anklepants" (due to a similar typeface) by some people), was originally introduced when then-owner Westinghouse Broadcasting (Group W) introduced its design language in 1963. As of 2020, KPIX-TV and WJZ-TV are the only two stations still using some form of the Group W typeface in their station logo.
The "5" became italicized in 1985, which then-sister stations WBZ-TV and KDKA-TV (except KYW-TV and WJZ-TV) would later follow suit in 1987 and 1991 respectively. In 1995, Westinghouse merged with CBS, making KPIX (and sister stations WBZ-TV, WJZ-TV, KYW-TV, and KDKA-TV, all switched to the network) an owned-and-operated station.
This logo was introduced on November 8, 1996, as a modified "5" used to replace the one previously used during the Westinghouse era.
Around 2003, Channel 5 was rebranded as CBS 5 (which would later add "Bay Area" around the late 2000s), in line with other CBS owned-and-operated stations.
The 2001 logo was boxed in.
This logo was slightly softened and modified, making it similar to the Westinghouse era, albeit in a slightly dense stroke. It is also full by shade of blue. It was introduced when CBS 5 was rebranded into KPIX 5.
The logo's color scheme was changed from a single color (i.e. blue) to silver with the "5" being in gold. However, the blue version with the gold "5" is used secondarily.