Mac storage basics · Caches, logs and temporary files
Does starting in Safe Mode clear caches on a Mac?
Short answer: It checks the startup disk and clears some system caches, which can fix glitches, but frees little space. On Apple silicon, hold power, select the disk, then hold Shift.
Starting in Safe Mode checks your startup disk and clears some system caches, such as font caches, which can fix odd behaviour. It isn't a storage cleaner, though; any space gained is usually small.
To start in Safe Mode on an Apple silicon Mac, shut down, press and hold the power button until startup options appear, select your startup disk, then hold Shift and choose Continue in Safe Mode. On an Intel Mac, hold Shift right after turning it on. Restart normally to leave Safe Mode.