WXXI-TV
WXXI-TV, virtual channel 21, is a Public Broadcasting Service member television station licensed to Rochester, New York, United States. Owned by the WXXI Public Broadcasting Council, it is a sister station of National Public Radio members WXXI and WXXI-FM. The three outlets share studios at 280 State Street near downtown Rochester; WXXI-TV's transmitter is located on Pinnacle Hill on the border between Rochester and Brighton.
Digital television
Digital channels
WXXI-TV entered the digital era in September 2003 when it signed on with Rochester's first full-power digital television signal.The station's digital signal is multiplexed:
| Channel | Video | Aspect | PSIP Short Name | Programming |
| 21.1 | 1080i | WXXI-HD | Main WXXI-TV programming / PBS | |
| 21.2 | 480i | WXXI-W | World | |
| 21.3 | 480i | WXXI-C | Create | |
| 21.4 | 480i | WXXI-K | PBS Kids | |
| 22.7 | 480i | WXXI-FM | Classical 91.5 |
Channel 21-4, now PBS Kids since February 1, 2016, was originally a digital standard definition simulcast of WXXI-TV's analog signal but is not currently transmitting, as 21-1 is identical.
Analog-to-digital conversion
WXXI-TV discontinued regular programming on its analog signal, over UHF channel 21, on June 12, 2009, the official date in which full-power television stations in the United States transitioned from analog to digital broadcasts under federal mandate. The station's digital signal remained on its pre-transition UHF channel 16. Through the use of PSIP, digital television receivers display the station's virtual channel as its former UHF analog channel 21.As part of the SAFER Act, WXXI-TV kept its analog signal on the air until July 10 to inform viewers of the digital television transition through a loop of public service announcements from the National Association of Broadcasters. WXXI-TV had been awarded a $202,498 federal contract for an outreach initiative to help Rochester's over-the-air viewers prepare for the digital transition.