Yes but it's a much different way of playing. Practice is practice, period. But when playing online you're viewing a 2D board whereas OTB is real, spatial. It may not seem much of a difference, but it is. If you practice almost exclusively online, try setting up an actual board for some of your analysis. But again, yes it does help.
Does playing lots of online chess improve your OTB chess ?

Yes but it's a much different way of playing. Practice is practice, period. But when playing online you're viewing a 2D board whereas OTB is real, spatial. It may not seem much of a difference, but it is. If you practice almost exclusively online, try setting up an actual board for some of your analysis. But again, yes it does help.

Yes but it's a much different way of playing. Practice is practice, period. But when playing online you're viewing a 2D board whereas OTB is real, spatial. It may not seem much of a difference, but it is. If you practice almost exclusively online, try setting up an actual board for some of your analysis. But again, yes it does help.
I'd say so. But the most important thing is not to be impulsive which is hard for me because i like to do things quickly and prefer not to wait too long. It mostly helps me spot tactics OTB when I play online, I guess. You have to adjust to longer time controls OTB than online if you play only blitz online like I do.

If you took a beginner and had them play nothing but 3 minute chess, that would improve their OTB play too (up to a point, and set up roadblocks for future improvement, but they would improve).
How much and long you improve depends on the quality of your training / study.
If you play players near your rating who use real openings and are taking the game seriously. If you use a real board, set up a physical clock to hit (even though it's not necessary), and even write down your moves, and you play in a quiet area with no distractions, and if you take the games seriously and try your best, then it's exactly the same as OTB.
As for setting up a board and recording your moves (and even using a clock) this is not as crazy as it sounds. Making your practice sessions as similar as possible to performance conditions is standard for many skills (not just chess).

If you took a beginner and had them play nothing but 3 minute chess, that would improve their OTB play too (up to a point, and set up roadblocks for future improvement, but they would improve).
How much and long you improve depends on the quality of your training / study.
If you play players near your rating who use real openings and are taking the game seriously. If you use a real board, set up a physical clock to hit (even though it's not necessary), and even write down your moves, and you play in a quiet area with no distractions, and if you take the games seriously and try your best, then it's exactly the same as OTB.
As for setting up a board and recording your moves (and even using a clock) this is not as crazy as it sounds. Making your practice sessions as similar as possible to performance conditions is standard for many skills (not just chess).
This is great advice! Implementing right now!

I played too much online. Now when I play OTB I have a hard time defending. My side of the board is so big that I often cannot keep control of everything. But when I attack I see everything in one compact picture. Online it's all the same size.
If not, it's obviously beneficial to play online chess for your OTB
Does playing matches with longer time controls online improve your OTB gameplay?