Up to 50,000 people a day are expected to attend the festival which is taking place at Glasgow Green until Sunday, with performers including Liam Gallagher, Snow Patrol, Amy Macdonald and The Chemical Brothers.
Festival goers have been arrived at the site under overcast skies since gates opened at 11am on Friday, some wearing face masks and many draped in Saltire flags.
Courteeners, Sam Fender, Blossoms and Inhaler were among the bands performing on Friday.
To gain access to the site everyone who attends TRNSMT must provide proof of a negative NHS Covid-19 lateral flow test (LFT), which must be taken no more than 48 hours before they arrive.
Ticket holders will be refused entry without proof of a negative LFT, and those attending on multiple days must take a second test 48 hours after the first one.
9. Fans return to TRNSMT
TRNSMT is asking fans to avoid sharing cars with people outside of their household and to wear masks if travelling on public transport Photo: Lisa Ferguson
10. Fans return to TRNSMT
The festival is operating as a completely cashless site for the first time, with all vendors accepting contactless payments Photo: Lisa Ferguson
11. Fans return to TRNSMT
Geoff Ellis, festival director of TRNSMT, said: “For lots of people, this will be the first big weekend out they’ve had in over a year – long overdue and extremely well-deserved after some really tough months." Photo: Lisa Ferguson