San Francisco Chronicle has a Left AllSides Media Bias Rating.

May 2022 Independent Review

A May 2022 Independent Review by an AllSides reviewer on the right confirmed the Left rating, though a reviewer on the left argued Lean Left was a better rating for the outlet. The reviewers noted that on the Chronicle's Politics page, there were indicators of a left bias:

• Word choices typically favored on the left, such as "restorative justice programs", "abortion rights", "reproductive healthcare" (to describe abortion), "pro-choice activists" (instead of "pro-abortion," the phrase typically used by conservatives); there was a positive description of pro-choice marchers: "The demonstration drew thousands of people, who were united in their desire to elevate the national conversation around reproductive health care."
• Negative coverage of anti-abortion activists (but no mention of actions by pro-choice activists that had made local San Francisco news in recent weeks): "Antiabortion activists ‘barged’ into UCSF women’s clinic, recorded patients and stalked a doctor,..."
• Negative coverage of people who didn't want the covid vaccine: "S.F. firefighters who refused vaccines fought their firings with misinformation and conspiracy theories..."
• Positive coverage of a "New Deal ballot proposal" 
• Critical coverage of a company that "made millions more in profit than allowed"